10mhz dds sweep function generator

7/29/2019 10mhz Dds Sweep Function Generator

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INSTRUCTION

MANUAL Model 4017B

10MHz DDS SWEEP/FUNCTION GENERATOR


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Table of Contents

1. Introduction to the Model 4017B 21.1 . Description....................................................................................................................................................................................................... 2

1.2. Feature Summary............................................................................................................................. 22. Front panel..............................................................................................................................................................................................................2

2.1 . Brief des cription. Using th e controls..........................................................................................................................................................2

2.2. Buttons and knobs. LED fun ctionality description. ..................................................................................... 3

3. Operating the Model 4017B.................................................................................................................. 63.1. Parameters setting......................................................................................................................................................................................6

3.1 .1.Freq uency setting (except FREQCOUNTER mod e)......................................................................................................................63.1 .2.Level setting (except FREQCOUNTER mod e)...............................................................................................................................83.1 .3.Offset set ting (except FREQCOUNTER mod e)..............................................................................................................................8

3.1 .4.Duty cycle setting (except FREQCOUN TER mod e)......................................................................................................................93.1 .5.CMOS lev el setting (except FREQCOUNTER mod e)...................................................................................................................93.1 .6.Sweep time set ting (only for INTERNAL SWEEP mod e)............................................................................................................9

3.1 .7.Sweep width setting (only for INTERNAL SWEEP mod e)........................................................................................................10

3.1.8. Gate setting (only for FREQCOUNTER mode)..................................................................................10

3.2. Mode description........................................................................................................................................................................................103.2.1 EXTERNAL VCG (External Voltage Control G enerator.....................................................................................................10

3.2 .1.1 Selecting EXTERNAL VCG mod e ..........................................................................................................................................12

3.2 .1.2 Selecting output wav eform.........................................................................................................................................................123.2 .1.3 Selecting th e frequ ency ...............................................................................................................................................................123.2 .1.4 Selecting th e lev el.........................................................................................................................................................................13

3.2 .1.5 Selecting th e offset .......................................................................................................................................................................133.2 .1.6 Selecting th e duty cycle...............................................................................................................................................................133.2 .1.7 Selecting output TTL/ CMOS lev el...........................................................................................................................................1 3..

3.2.2 INTERNAL SWEEP.........................................................................................................................................................................123.2 .2.1 Selecting IN TERNAL SWEEP mod e ......................................................................................................................................123.2 .2.2 Selecting output wav eform.........................................................................................................................................................12

3.2 .2.3 Selecting th e frequ ency ...............................................................................................................................................................123.2 .2.4 Selecting th e lev el.........................................................................................................................................................................13

3.2 .2.5 Selecting th e offset .......................................................................................................................................................................133.2 .2.6 Selecting th e duty cycle...............................................................................................................................................................133.2 .2.7 Selecting output TTL/ CMOS lev el...........................................................................................................................................133.2 .2.8 Selecting sw eep width.................................................................................................................................................................13

3.2 .2.9 Selecting sw eep time....................................................................................................................................................................13

3.2.2.10 Selecting type ofsweeping ..................................................................................................133.2.3 FREQC OUNTER (Frequency Co unter mode).........................................................................................................................13

3.2 .3.1 Selecting FREQCOUNTER mod e............................................................................................................................................143.2 .3.2 Selecting gat e period....................................................................................................................................................................14

3.2.4 Saving the defaultloaded modeat power-up............................................................................................................................143.2.5 Setting parameters examples..........................................................................................................................................................14

3.2 .5.1 Exampl e of set ting parameters in EXTERNAL VCG mod e................................................................................................14

3.2 .5.2 Exampl e of set ting parameters in INTERNAL SWEEP mod e............................................................................................163.2 .5.3 Exampl e ofset ting gate period in FREQ COUNTER mod e.................................................................................................193.2 .5.4 Exampl e of sav ing th e default mod e at power-up..................................................................................................................19

3.2 .5.5 Wav eform examples ....................................................................................................................................................................203.3 Remote operation.......................................................................................................................................................................................25

3.3 .1 Brief command d escription................................................................................................................................................................25

3.3 .2 Commands description........................................................................................................................................................................253.3 .2.1 Gen eral rul es..................................................................................................................................................................................25

3.3 .2.2 Commands description................................................................................................................................................................263.3.3 Remote program examples..............................................................................................................................................................34

3.3.3.1 Exampl e of setting p arameters in EXTERNAL VCG mod e using RE MOTE control mod e........................................34

3.3.3.2 Exampl e of setting p arameters in IN TERNAL SWEEP mod e using REMOTE control mode....................................35

3.3.3.3 Exampl e of setting p arameters in FREQCOUNTER mode using REMOTE cont rol mode............................364 Specifications...................................................................................................................................37

5 Service Information ..........................................................................................................................386 CE Cert39


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1. Introduction to the 4017B.

1.1 Description

The B&K Precision Model 4017B Sweep/Function Generator i s the newest 40XX family me mber. The 4017B enhances theperformance achiev ed b y i ts successful predecessor, BK P recision Model 4 017A Sweep/ Fun ction Generator. These p erformances are

achieved by using direct digital waveform synthesis (DDS) techniques for generating high accuracy and precision frequencies. A highperformance Dig ital Sign al P rocessor (DSP) co ntrols every aspect of th e DDS system, and is used for precise gen eration and processingof waveforms. The 4 017B has a vast number o f applications i n b oth analog and digital electronics, in the engineering, manufacturing,servicing, educational and hobbyist fields. This versatile signal source is capable of generating waveform (such as sine, triangle and

sq uare), pulse generation (through v ariable sy mmetry) and frequency sweep. Additionally, th e instrument provides a built-in frequencycounter.

The core of the function generator is a DSP, which is used to generate precision sine, square or triangle waveforms over 0.01Hz to10MHz range. This encompasses subaudible, audio, ultrasonic and RF applications. The symmetry of the waveforms can be changed

between 0% to 100% in 1% st eps, conv erting th e inst rument to a pulse generator capable of g enerating rectangular waves or pulses,

ramp or sawtooth waves and slued sine waves. An external voltage may be used to control operating frequency that can be changedusing a ratio between 1:1 and 1:100. Frequency sweep can be adjusted by changing the rate and the time sw eep, and al so the manner inwhich frequency is changed, linearor logarithmic.

The B&K P recision Model 4017B has 3 jacks: 2 for output and 1 input. The OUTPUT jack is t he main signal output. The TTL/CMOSjack is a TTL/CMOS compatible square wave output. The VCG/SWEEP jack is an input used for controlling the operating frequencyand input to the frequency co unter.

The 4017B is capable ofsupplying an output level of20.0Vpp with an offset voltage of 10.0Vpp (unloaded) on the main signal output,th e OUTPUT jack. The output impedance is 50 ohms; therefore the 50 ohm loaded output level is 10.0Vpp, with an offset voltagecapability of 5.0 Vpp. The output level can be adjusted with a resolution of 1mV and 10mV, dep ending on t he l evel range b eing

worked on. The offset level can be adjusted with a resolution of 1mV.

The 4017B is capable of generating a TTL/CMOS compatible square wave on TTL/CMOS jack. The CMOS ou tput l evel can be up to

14.0 Vpp (unloaded).

On the VCG/SWEEP input j ack, DC levels can be applied between 0V to 10.0V in order to change th e output operating frequency with

a ratio between 1:1 and 1:100. This jack is also us ed as a frequen cy counter input, for frequen cies betw een 5H z and 100MHz.The front panel of the Model 4017B includes LCD display, buttons, intelligent knobs and an LED in order to operate the unit quickand easy. The intelligent knobs are one of the main features of this new model, which reduces the number of controls needed for

changing the v alue of a parameter. The LCD display is a l arge 2-line 16 columns back lighted display.

The unit also features an EIA-RS232 connector on the rear of the unit. This permits the user to remote control the 4070A using ASCII

characters. No special hardware or protocols are needed; any dumb terminal or computer serial port can be used. The baud rate is fixedto 9600 BPS.

1.2 Feature Summary

2. Front panel.

2.1 Brief description.

Located on the Front P anel i s the L CD display, controls, power switch, connection jacks and LED (see the figu re 2 for details).The LCD display is a b acklit, 2-row 16-columns LCD display.

There are two kinds of controls: buttons and knobs.

Al l buttons are implemented as 1-p arameter single fun ction control, except th e range buttons that have a second fun ction . P ressing therange buttons (UP and DOWN buttons) twi ce at the same ti me w ill save the current working state as the default loaded state at power-

up. P ressing any other buttons at th e same t ime w ill have no effect upo n th e current w orking state. There are 2 kinds o f buttons: o necategory h as no LED s, the other category has LEDs. P ressing one of t he buttons from th e first category will change the values on theLCD display.

The knobs are implemented as 3-parameter s ingle function control, with intelligent control. The parameters defining a k nob are:value, rotating direction, and rotating speed. The value identifies the parameter being changed. The rotating direction, clockwise or

counter clockwise, determines whether the value of the parameter is increment or d ecrement respectively, by an amoun t of 1. The speedof rotation sets the position in the parameters digits of the digit being modified. The intelligent knob implementation allows a verysimple and intuitive way of changing parameter valu es and reducing the nu mber of controls used.


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Range buttons. Pressing those buttons will change the frequency range. Pressing the UP and DOWN buttons means that

frequency range will change up and down, respectively. If reaching the upper or lower range by pressing the UP or DOWN buttons, it

will pass to the lower range or upper range, respectively. Changing the range will affect the frequency field, frequency unit value and

frequency range.

By pressing these two buttons together twice, th e current mode and parameters will be saved as th e default power-up wo rking state.

-20 dB button. P ressing this button will engage/disengage 20dB attenuation in the signal o n OUTPUT jack. P ressing this

bu tton will chang e th e level fiel d. A light at - 20dB LED indicates eng aging the attenuator. No light at 20dB LED indicates

disengaging the attenuator.

20 dB LED. LED associated with the 20 d B button has a solid light when the attenuator is active, and no l ight when

attenuator is disabled.

COUNTER/VCG SWEEP button. P ressing this button will engage/disengage FREQ COUNTER mode. Engaging

FREQCOUNTER mode will change the content of LCD display and will also be i ndicated by a lighted COUNTER LED only.Disengaging FREQ COUNTER mode will change th e content of the LCD display and w ill also be indicated by a lighted VCG

SWEEP LED only.

COUNTER LED. LED is associated with COUNTER/VCG SWEEP button that lights when FREQCOUNTER mode is

active.

VCG SWEEP LED. LED is associated with COUNTER/VCG SWEEP button and lights w hen EXTERNA L VCG or

INTERNAL SWEEP mode i s active, and it is associated with a lighted E XT LED or INT LED respectively.

TTL/CMOS button. Pressing this button will enable/disable the use of CMOS LEVEL knob. If enabled, the CMOS LED is

lighted and the output level on TTL/CMOS output jack can be changed. If di sabled, the TTL L ED is lighted and there will b e a fixed

level on TTL/CMOS output jack.

TTL LED. LED is associated with TTL/CMOS button, and lights when there is an output of a fixed TTL style signal on

TTL/CMOS output jack.

CMOS LED. LED is associated with TTL/CMOS button and l ights when there is an o utput o f a variable CMOS style signal

on TTL/CMOS output jack.

SINE WAVE SELECT button. Pressing this button will enable o utputting of a sine style waveform on main output,

OUTPUT jack , and will be indicated by a lighted SINE WAVE LED.

SINE WAVE SELECT LED. LED associated with SINE WAVE SELECT button, it lights when unit outputs a sine wave

style signal on OUTPUTjack.

SQUARE WAVE SELECT button.Pressing this button will enable outputting of a square style waveform on main output,

OUTPUT jack, and it will be indicated by a lighted SQUARE WAVE SELECT LED.

SQUARE WAVE SELECT LED. LED associated with SQUARE WAVE SELECT button, it lights when unit outputs a

square wave style signal on OUTPUTjack.

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TRIANGLE WAVE SELECT button. P ressing this button will enable outputting of a tri angle style waveform on main

output, OUTPUT jack, and it will be indicated by a lighted TRIANG LE WAVE SELECT LED.

TRIANGLE WA VE SELECT LED. LED associat ed with TRIANGLE WAVE SELECT button, it lights when unit

outputs atri angle wave style signal on OUTPUTjack .

OTHER PARAMETERSfield. This field is used for showing otherp arameters values of the output signal on the OUTPUT

jack such as level, offset , du ty cycle, sweep time, sweep w idth or t he CMO S output lev el on TTL/CMOS jack. As long as th e value of

a parameter du ring a 7-second p eriod is not changed, th e unit will automatically show the output l evel on th e OUTPUT jack.

OTHER PARAMETERS identifiers. This field is associated with OTHER PARAMETERS field and will show a message

relevant to the nature o f the parameter valu e shown in OTHER PARA METERS field . As long as the value ofa para meter during a 7-

second period is not changed, th e unit will automati cally display the message identi fying th e output level parameter.

POWER switch. Turns power on and off.

FREQU ENCY knob. This knob controls the changing of the frequency within the current frequency range. The value is

di splayed in frequency fiel d. The changes are applied upon the start frequen cy in EXTERNAL VCG and INTERNAL SWEEP mode.

(See chapterx for a detailed explanation).

This knob has no meaning in FREQ COUNTERmode.

SWEEP TIME knob. This knob controls the changing of the time value set for sweeping the range between start frequency

and stop frequen cy. This knob has no meaning except INTERNAL SWEEP mode.

SWEEP WIDTH knob. This knob controls the changing of the ratio used for calculation of the width of frequency range,

swept in INTERNAL SWEEP mod e. This k nob has no meaning except in INTERNAL SWEEP mode.

SWEEP INT/EXT button. P ressing this button will change the working mode between EXTERNAL VCG and

INTERNAL SWEEP. The new mode will be indicated by the lighting of the corresponding LED, INT LED or EXT LED .

EXT LED. LED i s associated to SWEEP INT/EXT button and lights when EXTERNAL VCG mode is active.

INT LED. LED is associated to SWEEP INT/EXT button and lights when INTERNAL SWEEP mode is active.

SWEEPLI N/ LOG button. Pressing this button will change the way the frequency range in INTERNAL SWEEP mode will

sweep between linear mode and logarithm mode. The lighting of the corresponding LED, LIN LED or LOG LED will indicate the

working sweep mode. Button is valid o nly in INTERNAL SWEEP mode.

LOG LED. LED is associated to SWEEPLI N/LOG button and lights when logarithm sweep mode is engaged.

LIN LED. LED is associated to SWEEP LIN/ LOG button and lights whenl inear sweep mode is engaged.

DUTY CYCLE knob. This knob controls t he changing of t he duty cycle of t he output waveform on OUTPUT jack. It has

meanin g only forEXTERNAL VCG and INTERNAL SWEEP.

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DUTY CYCLE LED. LED is associated with DUTY CYCLE knob and lights whent he w aveform is asymmetric.

CMOS LEVEL knob. This k nob controls the changing of the CMOS level o n the output ofTTL/CMOS jack. This knob has

meaning only for EXTERNAL VCG and INTERNAL SWEEP. It is only active ifTTL/CMOS button enables it. The CMOS LED

must be lit.

VCG SWEEP/C OUN TER IN jack. Input jack is used to control the output frequency in EXTERNAL VCG mode or as

frequency count input in FREQCOUNTERmode.

TTL/CMOS jack. Output jack is used for s upplying a fixed TTL style signal or variable CMOS style signal, depending of

th e TTL/CMOS button, whose frequency is the same as the signals frequency on the main output, OUTPUT jack.

DC OFFSET knob. This knob controls the offset level added to the signal outputted on the OUTPUT jack. It has an LED

associated, DC OFFSET LED, whi ch lights when the offset add ed is not zero. This k nob h as meaning only in EXTERNAL VCG andINTERNAL SWEEP.

DC OFFSET LED. LED associated with DC OFFSET knob, lights when the value of offset added to the signal on the

OUTPUT jack is not zero.

OUTPUT LEVEL knob. This knob controls the output level on main output, OUTPUT jack. This knob has meaning only in

EXTERNAL VCG and INTERNAL SWEEP.

OUTPUT jack. The main output jack, used to supply the desi red waveform, defined by frequen cy, l evel, o ffset , duty cycle

forEXTENAL VCG mode and moreovertime and width sweep forINTERNAL SWEEP mode.

3. Operating the Model 4017B.

There are 2 modes o f controlling the unit and 3 modes of operating th e unit. One oft he control modes uses the front panel; the othermode i s by remote, using the RS232 interface. Each mode o f control excludes the other. When y ou are using the front panel you cannot

control the unit by remote. Engaging remote mode, using special command, deactivates the use of front panel controls. Disengaging th eremote cont rol by using a special command en ables the use of fron t panel button.

The 3 modes of operating are EXTERNAL VCG (external voltage control generator), INTERNAL SWEEP and FREQCOUNTER

(frequen cy counter).

Section 3.1 . - Mode description will describe the setting of operating mod es using front panel controls. Section 3 .2.-Remot e operation ,

will have a complet e description of the remote control mode.

3.1. Parameters setting

3.1.1. Frequency setting (except FREQCOUNTER mode).

The frequency s etting depends on the mode being worked. On EXTERNAL VCG mode, output frequency depends on the value set byturning the FREQUENCY knob and the DC value applied to VCG/SWEEP input jack. On INTERNAL SWEEP mode, since

frequency is sweeping a range, the value s et by turning the FREQUENCY knob represents th e start frequency of the range being swept.

For all modes (except FREQ COUNTERmod e), frequen cy is displayed on the first l ine, using a 5-digit field and a decimal point,whose position depends on the selected rang e. The unit is displayed after the frequ ency v alu e field. The frequen cy range used is always

displayed on the right of the first line.

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There are 5 frequen cy ranges avail able, which allows the user to set d esi red frequen cy between 0.00Hz and 10.000MHz. P ressing UPand DOWN bu ttons will change the rang e. Within every rang e the frequen cy can b e chang ed with a 5-digit resolution using

FREQUENCY knob.

The table below shows the frequency limit s for every range, measuring unit and how it displays the frequency range:

Range Lower Value Upper Value Unit Displayed frequency range

1 0.00 999.99 Hz 1k

2 1.0000 9.9999 KHz 10k

3 10.000 99.999 KHz 100k

4 100.00 999.99 KHz 1M

5 1.0000 10.000 MHz 10M

On the TTL/CMOS output jack thereis a CMOS or TTL style signal, depending on the selection ofTTL/CMOS button, with thesame frequency as th e signal outputted on OUTPUTjack (see section 3.1 .z. for d etails).

Frequency setting in EXTERNAL VCG mode.

Whether or not a DC l evel is applied on t he VCG/SWEEP input jack, turning the FREQUENCY knob will force the unit to display thefrequency v alue outputted on the LCD display if 0 v olts is applied on VCG/SWEEP input j ack (but only on the period th at the knob is

being turned). To hav e certain results, 0 v olts must be appli ed o n th e VCG/SWEEP input jack.

Use UP and DOWN buttons to select the appropriate rangethen turn the FREQUENCY knob till you reach th e desi red frequen cy (see

Table1 for ranges details).

Applying a DC value between 0 V and +10V will cause a frequency decrease, on a ratio between 1:1 and 1:100. Applying 0 V DC valu e

wi ll have no effect on t he output frequen cy but applying a + 10 .0V will decrease th e output frequen cy 100 times.

For certain output frequ encies, apply fixed DC l evels on VCG/SWEEPjack .

Varying t he positive DC level on VCG/SWEEPjack will cause the o utput frequency to sweep. The output frequency will follow the

changes in DC level.

ATTENTION: If th eD C level applied on VCG/SWEEPja ck cau ses th e output frequency to decrease under th e range limit, then

output frequency will not b e limit ed to t he lowest frequency allowed i n that range. It will b e displayed u sing thecurrent rangedisplaying rules.

INTERNAL SWEEP mode frequency setting.

The valu e displayed on the frequen cy v alu e field on the LCD display rep resents the instant output frequency and i s updated on the LCDdisplay every 0.1s.

Use UP and DOWN buttons to select the appropriate range of the sw eep start frequency. The FREQUENCY knob is us ed to select th esweep start frequency within a range (see Table1 for range s details).

The s weep is always done from the start frequency down t o stop frequency. The start frequency is always greater then the stop

frequen cy. The stop frequen cy can reach a maximum o f 1:100 o f start frequency (see subchapter 3.1.x for l earning how to set the stopfrequency). The unit reaches the stop frequency after a time, which can be set between 0.01s and 30.00s, with 0.01s resolution (seesubchapter 3 .1.y for learning how to set the time sw eep).

Turning the FREQUENCY knob will force the unit to display the sweep start frequency. Each time th e sw eep s tart frequency i smodi fied, either by pressing the UP or DOWN buttono r turningt he FREQUENCY knob, the sweep will be reinitialized and the unit

will start outputting from the st art frequency ag ain.

Table 1: Frequency ranges


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INTERNAL SWEEP mode frequency setting.

The valu e displayed on the frequen cy v alu e field on the LCD display rep resents the instant output frequency and i s updated on the LCD

display every 0.1s.

Use the UP and DOWN buttons to select the appropriate range of the sweep start frequency. The FREQUENCY knob is used to select

the sweep start frequency within a range (see Table1 for ranges details).

The s weep is always done from the start frequency down to stop frequency, thus start frequency is always greater then the stopfrequen cy. The stop frequen cy can reach a maximum o f 1:100 o f start frequency (see subchapter 3.1.x for learning how t o set the stopfrequency). The unit reaches the stop frequency after a time, which can be set between 0.01s and 30.00s, with 0.01s resolution (seesubchapter 3 .1.y for learning how to set the time sw eep).

Turning the FREQUENCY knob will force unit to display th e sw eep st art frequen cy. Each time th e sweep start frequency is mod ified,either by pressing the UP or DOWN buttono r turningt he FREQUENCY knob, the sweep will reinitialized and unit will start

outputting again fromthe start frequency.

ATTENTION: If s top frequency is under the current lower range limit , the frequency sweep will not stop at the range limit; thein stant fr equ encies will be displayed using the current range displa ying rules.

3.1.2. Level setting (except FREQCOUNTER mode).

This section describes the setting o f the signal level at the main o utput jack, OUTPUT jack.

Level can be set between 10mVp-p and 10.0Vp-p (on 50 load), using 2 ranges. Pressing 20dB button will chang e th e level rang e byengaging/disengaging the 20dB attenuate on the signal path (see Table2 for details). The 20dB LED associated with the button willli ght when the 20dB attenuate i s engaged. Turning th e OUTPUT LEVEL knob will change thelevel value within the current range.

Range L owest value Hi ghest val ue Unit Resoluti on -20dB L ED

1 10 1000 MV 1 Lighted

2 1.01 10.00 V 0.01 No light

Level i s displayed on the s econd line of the L CD display, using a 4-digit value field, foll owed by the unit. The decimal po int is usedonly for t he upper range. On t he right of the s econd line, the word Output will be displayed to i dentify t hat t he level p arameter haschanged. Since th e second line is used for displaying other parameters when they are modi fied, the unit will display the output level

again automatically 7 s econds after t he last parameter mod ification,

Note: The leveldisplayed on the LCD is considered a LOADED value which is t he level that will appear across a 50 load connectedto the OUTPUT jack. If you are connecting the output t o a high impedance load, the output voltage will be t wice what isentered.

3.1.3. Offset setting (except FREQCOUNTER mode).

This section describes the setting o f the DC level added to th e signal at the main output, OUTPUT jack.

Offset can be set between 5.000 V and + 5.000 V (on 50 load), by turning the DC OFFSET knob and using 0.001V resolution (seeTable 3). The DC Offset LED associated to DC O FFSET knob will be lighted w hen the D C level added to the signal is not zero.

Range L owest value Hi ghest value Unit Resoluti on

1 - 5.000 + 5.000 V 0.001

Offset i s di splayed on the second line of the L CD display using a si gn digit and a 4-digit value field , foll owed by the measuring unit. Onthe right of the second line the word Offset will be displayed to identify that the offset parameter has changed. Automatically, 7seconds after th e last change of the offset value, the unit will displayt he output level.

Note:

1. The offset voltage specified is a 50 LOADED value. This is the voltage that will appear across a 50 loadconnected t o the OUTPUT jack. If t he output is being connected to a high impedance load, the output voltage willbe twice what is entered.

Table2: Level ranges

Table 3 : Offset range


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2. Care must be taken when specifying an output offset voltageand level such that the output does not clip. The loaded

output cannot swing higher than + 5.000 V or lower than 5.000 V. Therefore:

| offset voltage | + * Vp-p < 5.0 V

3.1.4. Duty cycle setting (except FREQCOUNTER mode).

This s ection describes the duty cycle setting o f the signal outputt ed at the main output, OUTPUT jack.

Duty cycle can bes et between 0% - 100%, by tu rning the DUTY CYCLE knob, using1 % resolution (see Table 4). The DUTY

CYCLE LED associated to DUTY CYCLE knob will be lighted when set duty cycle differs 50 %, thu s the signal on main output isasymmetric.

Range L owest value Highes t val ue Unit Resoluti on

1 0 100 % 1

Duty cycle is displayed o n the second line of the LCD display, using a 3 -digit v alue field, followed b y the measuring unit. On the right

of t he s econd line, the words Duty Cycle will be displayed to identify th at the duty cycle p arameter is shown. Automati cally, 7seconds after th e last change o f the duty cycle v alue, the unit will display the output level.

3.1.5. CMOS level setting (except FREQCOUNTER mode).

This section describes the level setting of the TTL/CMOS style signal o utputted at th e TTL/CMOS outputj ack.

Output level at the TTL/CMOS jack can b e fixed or adjustable, depending o n the TTL/CMOS button. The button enables/disables th euse ofCMOS LEVEL knob.

IfCMOS L EVEL kno b i s disabled, it will output a fixed level TTL s tyle signal at 4.5V (unloaded). The TTL LED will b e lit . The fixed

TTL lev el is displayed on the second line of th e LCD display using a 2-digit value fiel d followed by the measuring unit. The words

TTL O UT will be displayed on the right of the second linet o identify that the TTL level is shown. The unit will display the outputlev el automati cally 7 seconds after th e last turning ofCMOS LEVEL knob,

IfCMOS L EVEL kno b is enabled, the CMOS output l evel can be set between 4.0V and 14.0V (unloaded) by turning it using 0.1Vresolution (see Table 5). The CMOS LED will be lighted. The CMOS l evel i s displayed o n the s econd line of the L CD display u sing a

3-digit value field followed by the measuring unit. the words CMOS OUT will be displayed on th e right o f the s econd line to identi fythat th e CMOS l evel is shown. The unit will automatically display the output level 7 seconds after t he l ast turning of CMOS LE VELknob.

Signal

L ow est v alu e H igh es t v al ue U nit Res olu ti on L ED l ig ht ed

TTL 3.0 5.5 V - TTL LED

CMOS 4.0 14.0 V 0.1 CMOS LED

P ress ing this button will enable/dis abl e the use ofCMOS LEVEL kno b. Ifenabl ed, the CMOS LED is lighted and the output lev el onTTL/CMOS output jack can be changed. Ifd isabled, the TTL L ED is lighted and there is a fixed level on TTL/ CMOS output jack.

3.1.6. S weep time setting (only for INTERNAL S WEEP mode).

This s ection describes the sweep t ime setting of the signal outputted on OUTPUT jack when INTERNAL SWEEP mode i s active(INT LE D and LIN/LOG LED are lighted).

Sweep time parameter represents the time needed by th e unit to perform a frequen cy sweep between two frequencies, a start frequen cyand a stop frequen cy. Sweep time can be set between 0.01 s and 30.00 s by turning the SWEEPTI ME kno b using a 0.01s resolution(see Table 6).

Table 4: Duty cycle range

Table 5: CMOS level range


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Range Lowest value Highest value Unit Resolution

1 0.01 30.00 s 0.01

Sweep time parameter is displayed on the second line of the LCD display using a 4-digit value field and a decimal point, followed byth e measuring unit. The words Sweep Time will be displayed on the right o f th e second line to id entify that the sweep time parameter

is shown. The unit will automati cally displ ay the output lev el 7 s econds after th e last change of th e sweep time value.

3.1.7. S weep width se tting (only for INTERN AL S WEEP mode).

This section describes the sweep width setting of the s ignal outputted on the OUTPUTjack when INTERNAL SWEEP mode i s active(INT LE D and LIN/LOG LED are lighted).

Frequency sweep is p erformed by ch anging the output frequ ency within a range. The start frequency is alw ays greater than th e stopfrequen cy. The start frequen cy setting is p erformed by turning the FREQUENCY knob. The stop frequency represents a fraction of the

st art frequen cy; the fraction set by turning th e SWEEPWI DTH knob. The sweep width v alue is not directly obtained by turning akn ob; we must calculate it u sing the formul a:

sweep_width = start_frequency * [1 1/(value_SWEEP_WIDTH_knob)] [Hz]

where value_SWEEP_WIDTH_knob represents the value set by turning the SWEEPWI DTH knob.

The fraction ofthe start frequency can beset between 1 and 100 by turning SWEEP WIDTH kno b, using 1-unit resolution (see Table7).

Value Stop frequency Sweep width Resolution Observation

1 Start frequency 0 Lowest value

1 00 (St art freq uen cy )/1 00 0 .9 9* (st art freq uen cy )1

Highest Value

Sweep width parameter is displayed on the second line of the LCD display using a 3-digit value field and a decimal point followed by

the measuring unit. The words Sweep Width w ill be d isplayed o n t he right o f the s econd line to identi fy t hat the sweep widthparameter i s shown. The unit will automati cally display t he output level 7 seconds after t he l ast chang e of th e sw eep w idth value.

3.1.8. Gate setting (only for FREQCOUNTER mode).

This s ection describes the gate period time sett ing used for measuri ng the signal frequen cy applied on COUNTER INjack.

By pressing the range buttons, UP and DOWN, we can swi tch g ate period time. There are 4 avail able period times for th e gate: 0 .01 s,0.1 s, 1 s, and 10 s.

Gate period time is displayed on the s econd l ine of the LCD display. The mode identifier is displayed first , then the word Counter,foll owed by the value of the g ate period time.

3.2. Mode description

3.2.1. EXTERNAL VCG (External Voltage Control Generator).

This mode is us ed for generating an output waveform who se output frequency depends on the value set using the range buttons, theFREQUENCY knob, and the external positive D C level applied on VCG SWEEP/COUNTER IN jack. The positive DC value applied

on VCG SWEEP/C OUNTER IN jack will cause the output frequen cy to decrease proportionally, with a ratio between 1:1 and 1:100(for DC value b etween 0 .0 V and +10.0 V, respectively).

3.2.1.1. Selecting EXTERNAL VCG mode.

EXT LED lig hting indicates active EXTERNAL VCG mode.

Table 6: Sweep time range

Table 7: sweep width calculation


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Otherwise there are 2 modes ofselecting EXTERNAL VCG mode using front panel buttons depending on the current working modeand the current value ofSWEEPI NT/EXT button.

Ifin the INTERNAL SWEEP mod e (INT LED li ghts), pressing the SWEEP INT/EXT buttonw ill engageth e EXTERNAL VCGmode. By engaging this mode, the EXT LED lights, and INT LED stops lighting.

Ifin the FREQCOUNTER mod e (COUNTER LED lights), pressingt he COUNTER/VCG SWEEPbutton will engage th e mod eselected by the SWEEPI NT/EXT button. Ift he button activates th e INTERNAL SWEEP, the case will be the same as described in

the previous paragraph otherwisethe button will activate EXTERNAL VCG mode.

3.2.1.2. Selecting output waveform.

Pressingoneofthe WAVEFORM buttons: SINE WAVE SELECT, SQUARE WAVE SELECT orTRIANGLE WAVE

SELECT, will engage one of the d esired waveform: s ine, square or triangle respectively. The current selected type of waveform wil lhave their corresponding LED lighted.

The shape of the waveform can be changed by modi fying the d uty cycle parameter (see example from secti on 3.2.5.4, where there aredi splayed waveforms, wi th different d uty cycle parameters).

3.2.1.3. Selecting the frequency.

The output frequency can be set on the OUTPUT jack between 0.00Hz and 10 .000 MHz. See section 3.1.1 for details regarding settingof the frequency value. This will also set the output frequency oft he TTL/CMOS style signal outputted on TTL/CMOS jack.

To set certain frequency v alues it is preferable that the VCG/SWEEP in put jack is disconnected from any s ou rce signal b efore pressingthe range buttons o r turning the FREQUENCY knob. This way the VCG/SWEEP input jack does not affect the setting of the currentoutput frequency.

After setting the frequen cy using fron t panel cont rols, th e sel ected output frequen cy can be mod ified by applying positive DC levels on

th e VCG/SWEEP input j ack. The DC levels must be within [0V, 10.0V] range, causing the output frequency t o decrease with a ratio o fth e origin al v alu e with the ratio v arying b etween 1:1 and 1:100, respectiv ely .

ATTENTION: Applying i n excess D C levels a bove +10.0 V on VCGSWEE P input jack can damagethe input.

Applying certain positive DC levels on VCG/SWEEPjack will decrease th e output frequen cy; the resulting fixed o utput frequen cy

represents a fraction ofthe original output frequency (see example 1).

Changing the DC level in a ramp style will cause a frequen cy sweep on the main s ignal o utput , the OUTPUT jack (see example from

section 3.2.5.1).

3.2.1.4. Selecting the level.

The signals output level on OUTPUT jack can be set using the OUTPUT LEVEL knob between 10mVp-p and 10.0Vp-p (on 50 load),regardless of the w aveform typ e. See section 3.1.2 for details regarding setting of the level value (see example from section 3.2.5.1).

The 20dB LED will be lighted i f the 20dB attenuation is engaged on t he main signal output path.

3.2.1.5. Selecting the offset.

The DC level add ed to th eo utput signal on OUTPUTjack can be s et using t he DC OFFSET knob between 5.000V and + 5.000V (on50ohm load), regardless of the w aveform typ e. See section 3.1.3 for details regarding setting of the o ffset value (see example from

section 3.2.5.1).

The DC OFFSET LED lights if the offset value is not 0.

3.2.1.6. Selecting the duty cycle.

The duty cycle of the output signal on the OUTPUTjack can be s et using t he DUTY CYCLE knob, between 0% and 100%, regardlessof the w aveform typ e. See section 3.1.4 for details regarding the setting of the o ffset v alue (see also examples 1, 2 and 3 on section3.2.1.8).


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Attention: The sq uar e wave has the true meaning o f duty cycle. By turning the DUTY CYCLE knob, the symmetry of the waveformwill change for th e sine wave and triangle wave. For sine wave, a distorted wave shape will be obtained and for thetriangle wave, a ramp wave will be obtained.

The DUTY CYCLE LED lig hts when output signal is asymmetric.

See section 3.2.5.5 for waveform exa mples.

3.2.1.7. Selecting output TTL/CMOS level.

The TTL/CMOS si gnal lev el can be changed using th e TTL/CMOS button and CMOS LEVEL knob.

IfCMOS o utp ut style is enabled, the output l evel can be set b etween + 4.0V and +14.0V, unloaded.See section 3.1.5 for d etails regarding setting of the CMOS level (see also examples 1 and 2 o n section 3.2.1.8).

3.2.2. INTERNAL SWEEP

This mode is used for outputting a signal on the OUTPUT jack th at s weeps a frequency range. The output frequen cy do es not d ependon any valu e applied on the input jack, VCG SWEEP/COUNTER IN .

3.2.2.1. Selecting INTERNAL SWEEP mode.

INT LED lighting indicates active INTERNAL SWEEP mode.

There are 2 modes of selecting INTERNAL SWEEP mode usi ng the front panel buttons depending on the current working mode andthe current value ofSWEEP INT/EXT button.

In EXTERNAL VCG mod e (EXT LED lights), pressingt he SWEEPI NT/EXT button will engage the INTERNAL SWEEP mode.By engagingt his mode, the INT LED lights and EXT LED stops lighting.

In FREQCOUNTER mod e (COUNTER LED lights), pressing COUNTER/VCG SWEEPbutton will engage th e mod e selected bySWEEP INT/EXT button. Ift he button activates EXTERNAL VCG , the case is the s ame as described in t he previous p aragraph,

otherwise the button will activate the INTERNAL SWEEP mode.

3.2.2.2. Selecting output waveform.

Pressingoneofthe WAVEFORM bu ttons: SINE WAVE, SELECT, SQ UARE WAVE SELECT or TRIANGLE WAVESELECT, will engage one of the d esired waveform: s ine, square or triangle respectively. The current selected type of waveform wil lhave their corresponding LED lighted.

The shape of the waveform can be changed by modi fying the d uty cycle parameter (see s ection 3.2.5.4, where there are displayedwaveforms for different duty cycle parameters).

3.2.2.3. Selecting the frequency.

The sweep st art frequen cy can be set directly on th e OUTPUT jack using the range buttons and the FREQUENCY knob. Sweep start

frequency can be s et between 0 .00Hz and 10.000MHz (see s ection 3.1.1 for d etails regarding the setting of the frequency v alue).

The sweep stop frequency cannot be set directly. The SWEEPWI DTH kno b must be turnedi n order to modi fy the sweep stop

frequency (seesections 3.1.7 and 3.2.1.9 for details).

Modifying any sweep p arameter will restart the sweep with the new lo aded parameters from the start frequency. Turning theFREQUENCY knob will alw ays display the sweep start frequency on LCD d isplay (see section 3.2.5.2 for exa mple of setting sweepstart frequency).


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3.2.2.4. Selecting the level.

The signals output level can beset on the OUTPUT jack, using the OUTPUT LEVEL rotary knob, between 10mVpp and 10.0Vpp (on

50 load), regardless of the waveform typ e. See section 3.1.2 for details regarding the setting of the l evel v alue (see example fromsection 3.2.5.2).

The 20dB LED will be lighted i f the 20dB attenuation is engaged on t he main signal output path.

3.2.2.5. Selecting the offset.

The DC level add ed to th eo utput signal on OUTPUTjack can be s et by using th e DC OFFSET rotary knob between 5.000V and +

5.000V (on 50 load), regardless of the w aveform typ e. See section 3 .1.3 for details regarding the setting o f the o ffset v alue (seeexample fromsection 3.2.5.2).

The DC OFFSET LED lights if the offset value is not 0.

3.2.2.6. Selecting the duty cycle.

The duty cycle of the output signal on the OUTPUTjack can be s et by using th e DUTY CYCLE rotary knob between 0% and 100%,

regardless of the waveform typ e. See section 3.1.4 for details regarding setting of the offset value (see example fro ms ection 3.2.5.2).

Attention : The t rue meaning o f duty cycle applies o nly to t he square wave. By turning the DUTY CYCLE knob, the symmetryof the waveform will be changed for the sine wavea nd t riangle wave. The sine wave will cause distorted wa ve

sh apes a nd the triangle will cause ramp waves.

The DUTY CYCLE LED lig hts when output signal is asymmetric.

See section 3.2.5.5 for w aveform exa mples .

3.2.2.7 Selecting output TTL/CMOS level.

You can set thelevel ofthe signal outputted on TTL/CMOS jacku sing the TTL/CMOS button and CMOS LEVEL rotaryknob. This

signals frequency is thesame as the signals frequency outputted on OUTPUT jack.

IfCMOS out put style is enabled, the output l evel can be set between + 4.0V and +14.0V (unloaded).

See section 3.1.5 for d etails regarding setting of the CMOS lev el (see example fro m section 3.2.5.2).

3.2.2.8 Selecting sweep width

The width of the frequency range sweep can be set by changing the value of a ratio. This ratio represents the ratio applied to sweep startfrequen cy in order to determin e the sweep stop frequ ency.

To do so turn the SWEEPWI DTH kn ob until it reaches the desired ratio. This ratio can be chang ed between 1:1 and 1:100. See section3.1.7 for details regarding the sweep width setting (see also example fromsection 3.2.5.2).

3.2.2.9 Selecting sweep time

The time of a si ngl e complete frequency range sweep can b e set by t urning the SWEEPTI ME knob until the desired time is reached.The time sweep can be changed between 0.01s and 30.00s. See section 3.1.6 for details regarding t he sweep time setting (see also

example fromsection 3.2.5.2).

3.2.2.10 Selecting type of sweeping

The way the output frequency is modified can be set in a linear or in a logarithmic mode b y p ressing the LIN/LOG button. This button

has two associated LEDs to indicate which way is activ e, LIN and LOG LED.

When INTERNAL SWEEP mode is not active, the LIN/LOG button action is dis abl ed and none oft he LED associat ed is lighted.

The way the change in frequen cy is selected does not affect any sweep p arameters.

3.2. 3 FREQCOUNTER (Frequency Counter mode)

This mode is u sed for measuring the signal applied o n the VCG SWEEP/COUNTER IN input jack. The applied signal must b e from

50mVp-p up to 10Vp-p. The main & TTL/CMOS o utput will output random frequencies when the frequency counter is eng aged.

The unit is capable of measuring frequencies from5 Hz t o 1 00 MHz, using 1 Hz resolution.

Attention: Ap plying levels in excess of above +10.0Vp-p on VCGSWEEP/COUNTER IN input jack, can damage the input.


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3.2.3.1 Selecting FREQ COUNTER mode

COUNTER LED lighting indicates active FREQ COUNTERmode.

Engage in FREQCOUNTERmode by pressing the COUNTER / VCG SWEEPbutton. The COUNTER LED will be lighted and theword Counterw ill be displayed on the second line of the LCD.

3.2.3.2 Selecting gate.

One of the four available gate periods can be set by using the UP and DOWN range keys. These different g ate periods allow di fferent

counting precision.

See section 3.1.8 for details regarding gate p eriod setting (see also example fro ms ection 3.2.5.3).

3.2.4 Saving the default loaded mode at power-up

The current working mode and i ts parameters can be s aved on a non-volatile l ocation. This is loaded at power-up, with the unitresuming work from thi s point. Ift he unit will be used for a certain application that requires little changes in the modes working

parameters, th e workload will be eased b y sp eeding the setting o f th e parameters.

By pressing the range buttons UP and DOWN twice at the s ame ti me, you can save the current working mode and its parameters.

By pressing the buttons once, the LCD display will change, and a message w ill appear: Press again for saving config. indicating theaction n ecessary for saving active con figuration. P ressing the buttons once again at the same ti me wi ll save th e activ e mode and a new

message will be displayed: Configuration saved.P ressing any otherb utton, combinations o f buttons or turning k nobs will exit thesaving and th e unit will display th e previous content (i .e. before saving).again on the LCDAfter a successful saving, the message Configuration sa ved will remain displayed for 3 seconds. Afterward, th e unit will

automati cally displ ay the previous content (i.e. before saving) on the LCD again.

Note: During the whole process the unit will work normally. There are no breaks or pauses i n the unit function.

See exa mple from secti on 3.2.5.3 o f saving a working configu ration, and h ow the L CD display must look like in the case of a su ccessful

saving.

3.2.5 Setting parameters e xamples.

Initial state

Suppose the unit is powered up, and the LCD displays look likeFigu re 2. The unit is in EXTERNAL VCG mod e, sy mmetri c

triangle style waveform out putted, no signal at VCG/SWEEP inputjack, output frequency set to 2.2222KHz, output lev el 1.01V, DCoffset 0 V, TTL st yle signal outputted on TTL /CMOS jack.

Suppose only the following LED is lighted: EXT LED, VCGSWEEP LED, TTL LED, TRIANGLE WAVE SELECT LED(see Figure 1).

3.2. 5.1 Example of setting parameters in EXTERNAL VCG mode.To output a sine wave signal, symmetry 65% , frequency 878KHz, level 6Vp-p, DC o ffset -1.023 V, th e CMOS output level must be s et to+ 8.0 V (unloaded).

Step 1

P ress the UPbutton twice t o reach t he frequency range whi ch is th e desiredfrequency (see table1). The LCD display should look like Figure 3. The outputfrequency is now 222.22 KHz.

222.22KHz 1M

1.01 V Out ut

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak(into 50)

Figure 3: LCD example of usi ngfourth frequency range

2.2222KHz 10K

1.01 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 2: LCD example of usi ng

second frequen cy range


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Step 2

Turn the FREQUENCY kn ob till y ou reach the desired frequen cy, 878.00 KHz.

The LCD display should look lik e Figure 4. The output frequency is now 878 KHz.

Step 3

P ress the SINE WAVE SELECT button. The unit must output a symmetrical sine wave type signal on the OUTPUT jack. The SINE

WAVE SELECT LED will light; the TRIANG LE WAVE SELECT LED will not light.

Step 4

Turn the DUTY CYCLE knob clo ck wise until th e displayed duty cycle reaches

65%. The LCD display should look like Figure 5. The output signal on theOUTPUT jack should b e asy mmetri c (an example of an asy mmetric sine wave isgiven in section 3.2.4.3).

The DUTY CYCLE LED must be lighted.

Step 5

Turn the OUTPUT knob clo ckwise until th e displ ayed output level reaches + 6.0V.The LCD display s hould look like Figure 6.

Step 6

Turn the DC OFFSET kn ob count er clo ckwise until th e displayed output offsetreaches 1.023V. The LCD display should look like Figure7 .

The DC OFFSET LED must be lighted.

Step 7

P ress the TTL/CMOS button. The CMOS LED will light; t he TTL LED will notlight. Turn the CMOS LEVEL knob clockwise until the CMOS level reaches 8.0V.

The LCD display should look like Figure 8.

878.00KHz 1M

1.01 V Output

FREQUENCY RANGE Hz

LEVEL


Figure 4: LCD example of usi ngfourth frequency range

878.00KHz 1M

65% Dut C cle

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 5: LCD e xample of displaying dutycycle parameter

878.00KHz 1M- 1.023 V Offse t

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 7: LCD example o f dis playing

offset parameter

878.00KHz 1M

6.00 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 6: LCD example o f

di splaying lev el

878.00KHz 1M

8.0 V CMOS OUT

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 8: LCD example o f dis playingCMOS output level


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Step 8 (automatic step performed)

The unit will d isplay the output l evel p arameter as shown in Figure 6, 7 s econds after th e last change on the second line of LCD display.

Ex ternal voltage control generator.

The current output frequ ency should be changed to 878 KHz by controlling the DC level a pplied to VCG/SWEEP input jack. Apply aDC l evel between + 5.0 V and + 10.0 V . The output frequency must sweep a range b etween 17.56 KHz and 8.78 KHz .

Illustrated b elow shows w hat will h appen at th e li mits of the DC l evel range applied to the VCG/SWEEPjack.

Step 9

Apply a + 5.0 V DC level at the VCG/SWEEPjack. The ou tput frequen cy will be17.56 KHz, and the LCD display should look like Figure9 at the start of the

frequency sweep.

Step 10

Change the DC level until it reaches + 10.0V. The output frequen cy will reach 8.78

KHz, and th e LCD display should look like Figure 10 at the end of the frequencysweep.

3.2.5.2 Ex ample of setting parameters in INTERNAL SWEEP mode.

To output a square wave signal whose frequencysweeps a 6MHz r ange in 21.33s, set t he sweep frequency to start at 8.000MHz,symmetry 40% , level 500mVp-p, DC o ffset + 2.1 0V. Set a CMOS output level to + 4.0 V (u nload ed).

Step 1

P ress the UPbutton 3 t imes to reach the d esired frequ ency range (see Table1). The

LCD display should look like Figure 11. The output frequency w ill now be 2 .2222MHz.

Step 2

Turn the FREQUENCY kn ob clockwise until you reach th e desi red frequ ency,

8.000MHz. The LCD d isplay should look like Figure 12. The output frequency isnow 8.0 MHz.

17.56KHz 1M6.00 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 9: LCD example o f dis playingfrequency when applying a DC level

8.78KHz 1M6.00 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 10: LCD example ofdisplayingfrequency when applying a DC level

2.2222MHz 10M

1.01 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak


fifth frequency range

8.0000MHz 10M1.01 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak


fifth frequency range


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Step 3

P ress the SQUARE WAVE SELECT button. The unit must output a s ymmetrical squarew ave types ignal o n the OUTPUTjack. As

an effect of pressi ng the button, the SQ UARE WA VE SELECT LED lights and the TRIANG LE WAVE SELECT LED is notlighted.

Step 4

Turn the DUTY CYCLE knob counter clock wise until the displayed duty cyclereaches 40%. The LCD display should look like Figure 13. The output signal on

OUTPUT jack should b e asy mmetri c (an example of an asy mmetric squ are wave isgiven in section 3.2.5.3).

The DUTY CYCLE LED must be lighted.

Step 5

P ress the 20dB button. This will engage the 20dB attenuation on the main signalpath. The si gnal lev el must decrease w ith 20dB, the output lev el will reach a levelof101mVp-p (on 50 ohmlo ad). The LCD display should look like Figure 14.

The 20dB LED must be lighted.

Step6

Turn the OUTPUT knob clo ck wise until the displayed output l evel reaches 500mV.The LCD display s hould look like Figure 15 .

Output level is now 500mVp-p (on 50ohmload).

Step 7

Turn the DC OFFSET knob clo ck wise until the displayed offset level reaches +2.100 V. The LCD d isplay should look like Figure 16.

The DC OFFSET LED must be lighted.

There will b e an asymmetric sq uarew ave signal of 500 mVp-p (on 50ohml oad), on

th e OUTPUTjack positioned at +2.100 Vp-p abovet he zero level.

8.0000MHz 10M

40% DutyCycle

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 13: LCD example of dis playingduty cycle parameter

8.0000MHz 10M

101mV Out ut

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak


-20dB attenuation

8.0000MHz 10M500mV Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak


-20dB attenuation

8.0000MHz 10M+ 2.100 V Offse t

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figu re 16: LCD example of dis playing

offset parameter


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Step 8

P ress the TTL/CMOS button. The CMOS LED will light and the TTL LED will

not light. Turn the CMOS LEVEL knob counter clockwise until CMOS levelreaches 4.0V. The LCD display should look like Figu re 17.

Step 9

P ress the SWEEP INT/EXT button. Switch the current mode to INTERNAL SWEEP when the INT LED lights.

Calculating the frequency sweep parameters.

The frequen cy stop frequen cy must be 2 MHz to get a 6 MH z frequency range sweep. Using the formula giv en in section 3.1.7, th efraction parameter set by tu rning SWEEPWI DTH knob must be4 because the stop frequency represents a fraction ofthe startfrequen cy; the fraction set by tu rning th e SWEEPWI DTH rotaryknob,

Step 10

Turn SWEEPWI DTH kno b counter clockwise until the displayed sweep widthparameter reaches 4. The LCD display should look l ike Figure 18.

Step 11

Turn SWEEPTI ME kn ob clock wise until the displayed sweep ti me parameter

reaches 21.33s. The LCD display should look like Figure 19.

All th e sweep parameters should b e set and the asymmetric square wave signal at the OUTPUTja ck sh ould b e sweeping a 6 MHz

fr equ ency r ange on 21.33s. There s hould be a CMOS type signal on the TTL/CMOS output jack whose frequencyfollows the mainoutput signal frequency.


After s etting all t he parameters at the limits o f the frequency rang es weep, the LCD display must look l ike Figure 20, when internalsweep s tarts, and Figure 21, when internal sweep stops.

8.0000MHz 10M

4.0 V CMOS OUT

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 17: LCD example ofdisplaying

CMOS output level

8.0000MHz 10M

4 SweepWidth

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 18: LCD example of dis playing sweepwidth parameter

8.0000MHz 10M

21.33s Swee Time

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 19: LCD example of dis playing sweep

ti me parameter

8.0000MHz 10M500mV Output

FREQUENCY RANGE Hz

LEVEL


Figure 20: LCD example ofsweepstart frequency

2.0000MHz 10M

500mV Out ut

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 21: LCD example ofsweep

st op frequen cy


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3.2.5.3 Ex ample of setting gate p eriod in FREQ COUNTER mode.

To measure the frequency of an input signal on VCG SWEEP/COUNTER I Njack, use 2 gate periods, 0.01s and 10s.Suppose the frequency of the input signal is 63,877,099Hz, the level is under 10Vp-p.

Step1

P ress the COUNTER IN/VCG SWEEPbu tton. The FREQCOUNTER mode willbe en gaged and the COUNTER LED will light. The rest ofthe LED indicating

working mode, VCG SWEEPLED, INT LED and EXT LED will not light.

Using a 0.01 s g ate period will b e the fastest period available. At high frequenciesvalues, there will be the highest counter error.

The cont ent of the L CD display changes and it must look like Figure 22

Step 2

P ressing the UPbu tton once will change th e gate period to 0.1s. Thegate p eriod will decrease to 0.1s and the count will be more accurate.

The content of the L CD display will change and i t must look like

Figure 23.

Step 3

P ressing the UPbu tton twice will ch ang e the gate period to 10s. The gate period willdecrease to 10 s and the count will be the most accurate available.

The content of the LCD display will changes and it must look like Figure 24.

3.2.5.4 Ex ample of saving the active mode

This example will show the saving of the current configuration. See Figure 1 (beginning of section 3.2.), to see how the

LCD display will look like before starting the saving.

Step 1

P ress both t he range buttons, UP and DOWN at th e same ti me. The LCD display

content w ill change, and it must look like Figure 25.

The unit is expecting th e user to press the range buttons again at the same time.

63877102 Hz

Counter 0.01 s

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figu re 22: LCD example o f dis playing measured

frequency using 0.01 s gate period time

63877100 Hz

Counter 0.1 s

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 23: LCD example ofdisplaying measured

frequen cy using 0.1 s g ate period time

63877009 HzCounter 10 s

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Fig ure24: LCD example ofd is playing measured

requen cy using 10 s gate period time

Press again for

saving config.

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure25: LCD example ofdisplaying theinitialization ofsaving current configuration


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Step 2 (the successful case)

P ress both t he range buttons, UP and DOWN again at the same ti me. The currentconfiguration will be saved and th e LCD display cont ent will chang e, and it must

look like Figure 26 , for 3 seconds.


There are 2 ways to get this situation.

The first way is to have a successful saving.

The 2nd is to press the other button, combin ations o f buttons or turning knobs. Thesaving ofconfiguration is abandoned.

Either way, the LCD display must look like figu re2 7.

3.2.5.5 Waveform ex amples

This s ection will h ave examples of the o utputted waveforms: sine, square, triangle for different du ty cycle values.

Attention: The true meaning of duty cycle applies only for the square wave. By turning the DUTY CYCLE knob, thesymmetry of the waveform can change for sine wave and triangl e wave. Therefore distorted w ave shapes will

be obtained for the sine wave and ramp waves will be obtained for the triangle.

Sine wave type signals

Example of asymmetric sin e wave, duty cycles et to 0%.

Configuration

saved

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 26: LCD example of dis playing the success o fsaving current config uration

2.2222KHz 10K

1.01 V Output

FREQUENCY RANGE Hz

LEVEL

Pea k-to- Peak

(into 50)Figure 27: LCD example of displaying after aconfiguration saving


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Example of asymmetric sin e wave, duty cycle set to 20%.

Example of symmetric sin e wave, duty cycles et to 50%.




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Exampl e of square wave type si gnals

Example o f asymmetric s quare wave (pulse wave), duty cycle s et t o 0%.

Example o f asymmetric sq uarew ave (pulse wave), duty cycle set to 25%.

Example of symmetric squ arewave, duty cycle set to 50%.


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Example of asymmetric s quare wave (pulse), duty cycle s et to 70%.

Example of asymmetric s quare wave (pulse), duty cycle set to 95%.

Exampl e of tria ngle (ramp) wave type sig nals

Example o f ramp wave (asymmetric t riangle), duty cycle set to 0%.

Example of ramp wave (asymmetric t riangle), duty cycle set to 20%.


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Example o f symmetric tri angle, duty cycle set to 50%.

Example of ramp wave (asymmetric t riangle), duty cycle set to 70%.

Example of ramp wave (asymmetric triangle), duty cycle set to100%.


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3.3 REMOTE mode

This is n ot an operating mode; it is another method of controlling the Model 4017B, through the RS232 interface. By using the

REMOTE mode, every aspect of the unit can b e controlled using a terminal without h aving to turno r press the front panel buttons.When REMOTE mode i s active, the front panel controls will b e disabled, and the t erminal will have the full control.

REMOTE mode i s implemented through RS232 interface by u sing 9 600 BP S fixed communi cation speed, 8 data bits, 1 stop bit and noparity.

REMOTE mode engaged will be indicated by displaying the word Remote on the second line of the LCD display and by th e sendingof a message t o the remote terminal th rough interface.

REMOTE mod e diseng aged will be indicated by retu rning th e LCD display to th e displaying mod e without th e word Remote on thesecond line of dis play. A message will be sent to t he terminal through interface and the front panel controls will b e enabled.

3.3.1 Brief command description.

Commands type:

Type I: Commands for engaging/disengaging REMOTE mode. Type II: Commands for determining information regarding the unit.

Type III: Commands for setting mode and parameters.

Type IV: Commands for loading/saving the default mode lo aded at power-up.

Type V: Commands for aborting/forcing command execution.

For every command, the unit returns a specific message regarding t he type in case o f success. Failing t o process a command will returnspecific error messages to the terminal. For full d escription of the commands see section 3.3.2.

ThetypeI command is used for engaging and disengaging the REMOTE mod e. Wi thout giving the command for engag ing remot emode, the unit will not accept commands of III and IV typ e. These commands will al so en able/disable the front panel controls.

ThetypeII command is used for finding information regarding the unit, i.e.: model, software version, hardware version, serial number,and whether or not unit is connected. These commands can be sent without REMOTE mode being active.

ThetypeIII command is used for a complete setting of th e operating mode and its associated parameters. The implemented commandscan emulate every front panel control . These commands are processed only if un it is in REMOTE mode.

ThetypeIV command is u sed for sav ing/loading the current configuration, saved configuration on/from a non-v olatil e location,configuration lo aded at power-up. These commands are processed only if uni t is in REMOTE mode.

ThetypeV command is used for aborting the current command executi on or t o force evaluation of the v alue sent to the unit in the case

of type III command. These commands are processed eveni fu nit is not in REMOTE mode.

3.3.2 Commands description

3.3.2.1 General rules

All commands are implemented using h ex ASCII characters 0 to 9 and A to F. Sending other characters will abort processing,

the characters received will be d iscarded and a sp ecific error message will be s ent to th e terminal .Characters within a command can b e sent with a maximum 4-second timeout . Failing to s end a character within this ti me will abort the

pro cess, the characters received will b e discarded and a specific error mess age will b e sent to the terminal.

There are commands th at do n ot transfer a parameter s v alu es and co mmands th at s end a parameters values t hrough interface. There

are rules when you transfer valu es. You can send a value using a combination o f a maximu m 10 ASCII characters. After 10 charactersare received or are exceeding th e 4-second timeout, the unit will start p rocessing the v alue.

The processing can be forced by issuing th e character !.


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General syntax:

XXXX[[z]yyyyyyyyyy]

These are th e notations used in the syntax expression:

XXXX Represents t he main command body implemented using the hex ASCII characters A to F, 0 to9. Main command b ody can be up to 4digit length. Commands are not cases ensitive.

[z] P arameter u sed only fortype III command and represents the sign digit. Use it onlywhen you have tosend a sign number (i.e. offset value).

[yyyyyyyyyy] P arameter u sed only fortype III command and its valu e represents a maximum 1 0-digit value.

Restrictions:

Valu es can be sent using ASCII characters 0 to 9, .,K, M. There cannot be any other characters in the 10-digit value.

There cannot be two . , two M ortwo K in the same 10-digit value.

Use the sign digit, + or- only for val ues that can be neg ative.

There cannot be two sign digits or the unit will abort p rocessing the value, the characters will be discarded and a specific error

message will be sent to the terminal .

Note: Any command can b e aborted at any sending stage, by issuing characterX. This will abort the current command processing,previous received characters will be d iscarded and a sp ecific message w ill be sent t o th e terminal.

3.3.2.2 Commands description.

Type I command: commands used to enable/disable the REMOTE mode.

RERE command

Syntax: RERE

Parameters: None

Description: Enables REMOTE mode. On the second lineof the LCD display, the Remotemessage will be displayed instead of theOutput message. The parameters can bemodi fied only through the RS-232 interface and the front panel will be disabled.

Example: RERE

Message returned to termi nal: Remotemode engaged

RDRD command

Syntax: RDRD

Parameters: None

Description: Disables REMOTE mode. On the second line of the LCD display, the Outputmessage will be displayed instead of the Remote message. The parameters can b e

mod ified only th rough the fron t panel.

Example: RDRD

Message returned to termi nal: Remotemodeoff.


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Type II command: commands used for finding information regarding the unit.

IID command

Syntax: II D

Parameters: None

Description: Asks for the unit type connected to the interface.

Example: II D

Message returned to termi nal: BK PrecisionModel 4017B

IP command

Syntax: IP

Parameters: None

Description: Asks for t he presence of the uni t at t he t ermi nal . Uni t must ret urn a mes sage

indicating the presence.

Example: IP

Message returned to termi nal: Unit connected.

ISV command

Syntax: ISV

Parameters: None

Description: Asks the unit about the current soft version.

Example: ISV

Message returned to termi nal: Softwareversion: X.Y, where X represents the b ase soft v ersion and Y representsthe number of the soft version derived from the base v ersion.

IHV command

Syntax: IHV

Parameters: None

Description: Asks the unit about the current hard version.

Example: IHV

Message returned to termi nal: Hardwareversion: Z.W, where Z represents the baseh ard version and W

represents the number of the h ard version derived from the b ase version.

IN command


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Syntax: IN

Parameters: None

Description: Sends to terminal the unit s serial number.

Example: IN

Message returned to termi nal: Serial Number: XXX-YYYY-ZZZZ wh ere XXX-YYYY -ZZZZ

Represents the serial nu mber according to BK P recision codification.

Type III command: commands for setting mode and its parameters.

CM command

Syntax: CMx

Parameters: x is a 3 possible value digit: 0, 1 or 2.

Description: Sets the units working mode according to the value of the x parameter. If x > 2the unit remains in the working mode and a specific error message is sent toterminal.

Ift he mode i s already set, any action i s aborted and a sp ecific message i s sent t oterminal.

Example: CM0 the EXTERNAL VCG mode is engaged.

Message returned to terminal : ModeE XTERNAL VCG engaged ifx= 0

ModeINTERNAL SWEEP engaged ifx= 1

ModeF REQCOUNTER engaged ifx = 2

Modeunavailable ifx > 2

Modealreadyset to enabl e a mode w hich is already running .

CF command

Syntax: CFx [yyyyyyyyyy]

Parameters: x represents a digit, valid for t he following values: I, U, D, S.

yy yyyyyyyy is a decimal digit v alu e who takes valu es between 0 and 1000000000,

valid only if x = S.

Description: Case 1

In EXTERNAL VCG and INTERNAL SWEEP mod e, th is command

sets/modifies/interrogates thevalue ofthe start frequency.

If x = S , the s tart frequency will be set at the value o f the yyyyyyyyy parameterwh ich takes values between 0.00Hz and 10000000.00Hz with a 0.01HZ resolution.

If x = U or x = D, the wo rking domain of the y yyyyyyyy parameter will bein creased or resp ectively d ecreased.

If x = I th e value of the st art frequency will be sent to the terminal .

Case 2

In FREQCOUNTER mod e this co mmand mod ifies th e g ate period u sed inmeasuri ng frequen cy or asks about the measu red frequen cy.

If x = U or x = D the gate p eriod will be increased o r respectively decreased.


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If x= I the measured frequency will be sent to the terminal.

Example: Case 1

CFS 4000 sets the start frequency at 4000 Hz.

Case 2

CFU increases the gate period used in measuring frequency

Message returned to terminal : Case 1:

Output frequency: yyyyyyyy,yyHz if the command was correctly sent.

Wrong valuesent if the yyyyyyyyy parameter sent was not a valid value.

Case 2:

Gateperiod 0.1s and Measured frequency: yyyyyyyyyHz if the gate period ischanged.

Measuredfrequency: yyyyyyyyyHz ifasked about measured frequency.

CL command

Syntax: CLx [yyyyy]

Parameters: x represents a digit that has 2 valid values: I or S.

yyyyy is a decimal digit value between1 0 and 10000, valid if x = S.

Description: These commands set/interrogates the output level on the OUTPUT jack. Thecommand is available only in EXTERNAL VCG orINTERNAL SWEEP mode.

If x = S the output level will beset at the value of the y yyyy, a level that can take

values b etween 10mV and 10 000mV.

If x = I th e output level at th e OUTPUT jackw ill be sent to terminal.

Example: CLS3 45 sets th e output level at 3 45mV.

Message returned to terminal : Outputlevel: yyyyymV i f the co mmand w as correctly sent

Wrong valuesent if yyyyy parameter sent was not a valid v alu e.

CO command

Syntax: COx [zyyyy]

Parameters: x represents a digit that has 2 valid values: I or S.

z is a valid digit only if x = S and has 2 valid values: + or - .

yyyy is a decimal digit value between 0 and 5000, valid if x = S.

Description: This command sets/interrogates th e offset l evel added at th e OUTPUTjack . Thecommand is available only in EXTERNAL VCG and INTERNAL SWEEP mode.

If x = S , the offset l evel will be set at the value of the zyyyy parameter, offset t hat

can take values between 5000 mVand +50 00 mV. It is n ecessary th at the sign issent firs t; otherwise the fol lowing parameter will b e dropped.

If x = I, the offset value at the OUTPUT jack will be sent to the terminal .

Example: COS-4333 sets the OUTPUT offset level at -4333 mV.

Message returned to terminal : Offset: zyyyymV if the command i s s ent co rrectly.

Wrong valuesent ifyyyy parameter sent was not a valid value.


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CT command

Syntax: CTx [yyy]

Parameters: x represents a digit that has only 2 valid values: I or S.

yyy is a d ecimal digit value between 40 and 140, valid if x =S.

Description: The command sets/interrogates thelevel on TTL/CMOS output. The command isavailable only on EXTERNAL VCG and INTERNAL SWEEP mode.

If x = S the CMOS output level w ill take values between 4.0 and 14.0 V.

If x = I the CMOS l evel value will be s ent to terminal

Example: CTS123 sets the TTL/CMOS output level at 12.3V

Message returned to terminal : TTL/CMOS output: 12.3 V if the co mmand i s s ent correctly.

Wrong valuesent if yyy parameter sent w as not a v alid value.

CD command

Syntax: CDx[yyy]


yyy is a d ecimal digit value between 0 and 100, valid if x = S.

Description: The command sets/interrogates theduty cycle ofthe signal output on OUTPUTjack. The command is available only on EXTERNAL VCG and INTERNAL

SWEEP mode.

If x = S, the du ty cycle will take values between 0 and 100%.

If x = I, the d uty cycle value will be s ent to the terminal .

Example: CDS0 sets the duty cycle to 0%.

Message returned to terminal : Dutycycle: yyy% if the command i s s ent correctly.

Wrong valuesent if the yyy parameter sent was not a valid value.

CW command

Syntax: CWx[yyy]


yyy is a d ecimal digit value between 1 and 100, valid if x = S.

Description: The command sets/interrogates the ratio factor used to calculate the STOP frequencyof the o utput signal at OUTPUT jack. The command i s avail able only on

INTERNAL SWEEP mode.

If x = S t he value oft he ratio will take values between 1 and 100.

If x = I the ratio factor u sed t o calculate the STOP frequency will b e sent toterminal.

Example: CWS45 sets the ratio applied to the START frequency at the value of 45.

Message returned to terminal : Sweep widthratio: yyy% if the co mmand i s s ent correctly.

Wrong valuesent if the yyy parameter sent was not a valid value.

Command not allowed in currentmode if INTERNAL SWEEP mode isn t thecurrent working mode.

CS command

Syntax: CSx [yyyy]



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yyyy is a decimal digit value between 1 and 3000, valid if x = S.

Description: The command s ets/interrogates the frequency sweep ti me of th e output signal on the

OUTPUT jack. The command i s available only on INTERNAL SWEEP mode.

If x= S the sweep ti me will t ake values between 0.01 s and 30.00 s. Ifx = I thesweep ti me will be sent to terminal.

Example: CSS333 sets the sweep time value at 3.33 s.

Message returned to terminal : Sweep time: yy.yy s if the command i s s ent correctly.

Wrong valuesent if the yyyp arameter sent is not a valid value.

Command not allowed in currentmode ifINTERNAL SWEEP mode isnt thecurrent working mode.

CV command

Syntax: CVx

Parameters: x represents a digit that has only 2 valid values: 0 or 1.

Description: The command sets theway in which the frequency is modified during a frequency

sweep. This command i s available only on INTERNAL SWEEP mode.

If x=0, the l inear sweep mode i s engaged

If x=1, th e log arithmic sweep mode i s engaged

Example: CV0

Message returned to terminal : Li near sweep modeengaged ifx=0.

Logarithmsweep mode engaged ifx=1.

Unavailablecommand ifx is not a valid value.

Command not allowed in currentmode ifthe INTERNAL SWEEP mode is not

the current working mode.

CE command

Syntax: CEx

Parameters: x represents a digit who has only 3 valid values: 0, 1, 2.

Description: The command s ets t he output signal type: sine, triangle or s quare on t he main output,

OUTPUT jack. The command i s available only on EXTERNAL VCG andINTERNAL SWEEP mode.

If x = 0, a sine wave signal is outputted on OUTPUTjack.

If x = 1 a triangle wave is outputted on OUTPUTjack .

If x = 2 a square wave is outputted on OUTPUTjack.

Example: CE0

Message returned to terminal : Sinefunction generated ifx = 0.

Trianglefunction generated ifx = 1 .

Squarefunction generated ifx = 2.

Function not implemented if x digit sent was not a valid value.


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CB command

Syntax: CB x [y]


y represents a decimal digit, valid if x = S.

Description: The command sets/interrogates the mode ofdisplaying thedecimals in American orFrench.

If x= S and y = 0, the American mode of displaying the decimals using point will beengaged.

If x = S and y = 1, the French mode of displaying the decimals u sing comma wil l b e

engaged.

Example: CBS0 th e decimals will b e displayed according to the American mode.

Message returned to terminal : LCD point displayengaged (American option) ify = 0.

LCD comma displayengaged (French option) ify = 1.

Incorrect command ifany ofthe digits sent was not valid.

CG command

Syntax: CG x[y]


y represents a digit that has 2 valid values: C or T, only if x = S.

Description: The command sets/interrogates the output typeo n TTL/CMOS jack.

If x = I, the typeof signal outputted on TTL/CMOS jack will be send to theterminal.

If x = S and y = C, a CMOS style signal will be outputted on TTL/CMOS jack.

If x= S and y = T, a TTL style signal will be outputted on TTL/CMOS jack

Example: CGST

Message returned to terminal: TTL si gnal on TTL/CMOSj ack ify = T

CMOS signal on TTL/CMOS jack ify =C

Incorrect co mmand i f any of the digits sent was not v alid.

CA command

Syntax: CAx[y]


y represents a digit that has 2 valid values: E o r D, only if x = S.

Description: The command sets/interrogates if 20dB att enu ation is engaged or dis eng aged on themain si gnalo utput, OUTPUT jack.

If x = I, a message indicating i f att enuation is engaged or diseng aged at signal

output will be s end to the terminal.

If x = S and y = E , the 20dB attenuationw ill be engaged on OUTPUT jack.

If x= S andy = D, the 20dB attenuationw ill bed isengaged on OUTPUTjack.

Example: CASE will engage the 20dB attenuation.


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Message returned to terminal : -20dB attenuation engaged on OUTPUT jack if y = E

-20dB attenuation disengaged on OUTP UT jack if y =D

Incorrect co mmand i f any of the digits sent was not v alid.

Type IV command: Used for saving/loading the current configuration / saved configuration.

SSS command

Syntax: SSS

Parameters: none

Description: Command us ed to save th e current wo rking mod e and its parameters as th e defaultloaded state at power-up.

Example: SSS

Message returned to terminal : Default power-upstatesaved if the current working mode and its parameters w eresuccessfully saved.

Unavailablecommand if the command s ent was incomplet e

SLS command

Syntax: SLS

Parameters: None

Description: Loads the default lo aded state at power-up as the c

10mhz dds sweep function generator

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