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I, Checks and Adjustments

This section contains procedures to check the specifications and measurementlimits listed in Table 2-1. The Specification or Measurement Limit Is listed at thebeginning of each part as well. These procedures contain only check steps, sincethe SD-24 TDR/Sampling Head has no internal adjustments. The pads in thissection provide a logical sequence of checks for performing a comprehensiveperformance verification procedure to verify that the sampling head meetsspecifications. To functionally test the sampling head, perform the parts Inlable 2-1 which have a “yes” indication in the Functional Test Column.

Refer to the SD-24 TDRISamp!ing Head Installation/User Reference manual formore Information about specifications and sampling head operation. Refer toTable 2-2 for information concerning test equipment used in the setups.

Part 1 Power-On none none yes

Part 2 Dot Itansient Response250 mywith automatic �59~errorcalibration

yes

500 my with automatic �59~errorcalibration

no

500 my with default ±20%errorsettings

no

1.0 V without automaticcalibration

adjusted to100% at 1 V

no

Pan 3 OffsetOffset ±2mV yes

Offset change withrepetition rate

±5my no

Part 4 Noise (SN 8020652 and above)Smoothing, on �550 pM rmsSmoothing, off �1.2 my mis

no

Part 4 Noise (SN 8010651 and beiow)Smoothing, on �900 sV rmsSmoothing, off . �2 my rrns

no

.

Part 5 Rise lime 17.5 ps yes

Table 2-1 Measurement Limitsand Specifications

Part and Description Measurement SpecificationUmit

FunctionalTest

42-1SD-24 Service Reference REV Nov 1989

GIDEP Metrology

Cropping of the black borders around each page was not accomplished, as it increases file sizes in the database. However, this action will be accomplished on files in future versions of Metrology DVD.

- . < . . . - - . .e -m. - . . .

TEK . INTER-OFFICE COMlvllJNlCATlON .- .

Sohn Martin 94-540 TO 3:. ' t Juno 25, 1991

FWW Frank Gray, SO-PAT

M3KC.T GIDEP permit request

In response to the request to grant permission to the Government Industry Exchange Pro ram Tektronix operator, service and P

(GPDEP) to reproduce nstruction manuals,

Tektronix, Inc. hereby grant6 such permission for distribution of such documents to any GTDEP user that is a full participant in the Metrology Data Interchange Data Base of GIDEP provided that all copies of the original work include the entire copyright notice and ownership statement exactly a-& it appears in the original, together with the Legend "Reproduded with pemieeion,a

This permission has been approved by the Intellectual

aeon% 1[ Committee of Tektronix

ded and a copy of this memo may

to GIDEP to provide'the requested permission.

g:&dy Group Pat&t Coun&al

Checks and AdJusW7ents

Table 2-1 — Measurement Limits and Specifications (cont)

Part and Description Measurement Specification FunctionalLimit Test

Part 6 Acquisition Aberrations no(with 067-1338-00 source)

Oto300ps -7%tol2%300psto5ns ±4%SnstolOOns ±1.2%100 ns arid up +0.6%—lOnsto—2Ops ±4%

Part 7 Coincidence Between 10 Ps flOChannels

Part 8 MaxImum Signal 1% of step noVoltage amplitude

Part 9 Isolation Between 1% nochannels .

Part 10 Output Amplitude 250 my+5mV

yes

Part 11 TDR Aberrations noOto300ps —5%tolS% .

300psto5ns ±3%Snsandup ±1%—lOnsto—2Ops ±3%

Part 12 Reflected Rise Time • 35 Ps no

S C

(~.

2-2 REV JUN 1959 SD-24 Seniice Reference Manual

Checks and Adjustments

Test Equipment The test equipment in Table 2-2 contains suggested test equipment for use In thismanual. Procedure steps are based on the test equipment examples given, butother equipment with similar specitications may be substituted. Test results, setupinformation, and related connectors and adapters may be aitered by the use ofdifferent equipment.

4

Table 2-2 — Test Equipment

DescriptIon MinimumSpecificatIon

Examples of ApplicableTest Equipment

11800-Series Oscillo- Tektronix digital TEKTRONIX 11801 Digitalscope sampling oscilloscope Sampling Oscilloscope

TEKTRONIX 11802 DigitalSampling Oscilloscope

Pulse Generator 1 ns rise tIme, 5 Voutput, 10 Hz to250 Mhz frequencyrange

TEKTRONIX PG 502 PulseGenerator with aTM 500-Series PowerModule

Time Masl Generator 1 ns through 5 smarkers In a 1-2-5sequence, at least 5parts in 10~accuracy

TEKTRONIX TG 501 TimeMail< Generator with aTM 500-Series PowerModule

Calibration Generator

.

DC othput, 0.5%accuracy 1 V outputamplitude

TEKTRONIX PG 506Calibration Generator with aTM 500-Series PowerModule

Calibration Step TSCTRONIX 067-1338-OXGenerator

!

Calibration Step Generator(where X represents either a0, 1, 2,3, 5, ore: dependingon the power supplyappropriate for your country.Refer to Section 5,Replaceable Parts)

System Controller Any compatible control-ler with MS DOS and a

TEKTRONIX PEP 301System Controller

serial port configuredfor COM1

.

so a Termination, Impedance 50 (1. SMA Tektronix Part 015-1022-00SMA connectors connectors

50 a Termination, Impedance, 50(1, BNC Tektronix Part 011-0049-01BNC connectors connectors

Precision Short Circuit Female 3.5mm Tektronix Part 011-0150-00Termination compatible connectors

Precision 6-Inch Semi- Male to male 3.5 mm Tektronix Part 015-0564-00Rigid Cable compatible connectors

SD-24 Serv/ce Reference Manual REV JUN 1989 2-3


Examples of ApplicableTest Equipment

table 2-2 — Test Equipment (cant)

Description MinimumSpecification

Short CircuitTerminators, SMAConnections(2 required)

Male SMA Connectors Tektronix Part 015-1020-00

.

Coaxial Cable, so a(2 required)

so a, 36-Inch, maleBNC connectors

Tektronix Part 012-0482-00

Serial Cable 10-ft R5-232-Q Cable Tektronix Part 012-0911-00

Adapter, SMA to BNC(2 required)

SMA male to BNCfemale


Attenuator, 2X 6 dB attenuation, 50 £2,one male and onefemale BNC


Attenuator, 5X 14dB attenuation,50 LI, one male andone female BNC

TektronIx Part 011-0080-02

Wrist Strap Tektronix Part 008-3415-00

Static Control Mat Tektronix Part 006-3414-00

Needle-nose pliers

Pozidrive Screwdriver P1 tip

S

S

S

(

(.

2-4 REV JUN 1939 SD-24 SeN/ce Reference Manual


Using These Each part begins with a setup illustration that shows what test equipment is5 Procedures needed and how to connect It. Refer to Table 2-2 for an example of the testequipment for each part.

Conventions In this ManualIn these procedures, the following conventions are used:

• CAPITAL letters within the body of text identify front panel controls, indicators,and connectors (for example, MEASURE) on the oscilloscope and samplinghead.

• Hold letters identify menu labels and display messages.

• initial Capital letters identify connectors, controls, and indicators (forexample, Position) on associated test equipment. Initial Capital letters alsoIdentify adjustments inside the sampling head.

In some steps, the first word is italicized to identify a step that contains aperformance verification and/or an adjustment instruction. For example, if CheckIs the first word In the title of a step, an electrical specIfication is checked. IfAdjust appears in the title, the step involves an electrical adjustment. If Examine isthe firm word in the title, the step concerns measurement limits that Indicatewhether the sampling head Is operating properly; these limits are not to beinterpreted as !lectrical specifications.

initialized and Stored SettingsAt the beginning of most steps, the user is instructed to Initialize the oscilloscopeas part of the setup, The initIalIze feature, available throughthe UTILITY menu,presets all oscilloscope controls and functions to known values. Initializing theoscilloscope at the beginning of a step eliminates the possibility of settings tomprevious parts causing erroneous or confusing results.

Menu Selections and Measurement lbchnlques

Details on measurement techniques and instructions for making menu selectionsare generally not included In this manual. Comprehensive descriptions of menusand oscilloscope features are located in the 11801 User Reference manual,thel 1802 User Reference manual, and the SD-24 TDR/Sampling HeadInstallation/User manual.

Tutorial ManualThe tutorial manuals, IntroducIng the 11801 Digital Sampling Oscilloscope andIntroducing thel 1802 Digital Sampling Oscilloscope, are strongly recommendedto tamiharize the first-time user with 11801 and 11802 Oscilloscope controls andfeatures.

SD-24 SeN/ce Reference Manual REV JUN 1989 2-5

C/i~cksand Adjustments

0

(notlnstalI~d

yet)

Procedure to Power-on

~ Step 1: Set the following In the order listed:

Sampling head Not installed yet11801/11802 Oscilloscope

ON/STANDBY switch STANDBY

fl Step 2: Install an SD-Series sampling head in the osculoscopes left-mostcompartment,

~ Step 3: With the oscilloscope’s rear panel PRINCIPAL POWER SWITCH setto OFF, connect the 11801/11802 Oscilloscope to a suitable power source.

~ Step 4: Set the rear panel PRINCIPAL POWER SWITCH to ON and then theoscilloscope’s front panel ON/STANDBY Switch to ON.

Part 1 Perform this part within the ambient temperature range Of + 18 and + 28~C, toPower-on assure proper oscilloscope operation.

Setup to Power-on

11801

(

0

(notinstalled

yet)

(

SeWp10 Power-on

2-6 REV JUN 198~ SD-24 Service Reference Manual

Part I Power-on

When the 11801/11802 Oscilloscope Is first installed, the rear panelPRINCIPAL POWER SWITCH should be set to and remain in the ON position.Then, use the front panel ON/STANDBY switch to perform all subsequentpower switching.

E Step 5: Power-on the following test equipment, so that it Is warmed up withthe oscilloscope to be tested:

• Calibration generator

• Calibration step generator

• Time mark generator

• Pulse generator

A complete lIst of test equipment is listed in Table 2-2.

• Allow a 20 mInutewarm-up for the Sampling head and test equipmentbefore doing the performance checks.

50-24 Service Reference REV NOV1989 2-7


Part 2Dot Transient

Response

This part shows the setup and lists the procedures to check the dot transientresponse.The dot transient response is examined at 250 my and 500 my withautomatic calibration settings, at 500 my with default settings, and checked atwith manual calibration settings.

Measurement LimIts

The measurement limits for the dot transient response error are:

�5 % error when measured at 250 my and 500 my with automatic calibrationsettings

• 20% error when measured at 500 my with default

SpecificationsThe specification for the dot transient response at 1 Vadjustable to 100%

Setup to Check Dot Transient Response

is that the amplitude is

Check Dot Transient Response

2X Attenuator(not connected yet)

SD-24 Service Reference Manual

Part 2 Dot TransientResponse

I,

Procedure to Check Dot ‘Tpanslent Response

C Step 1: initialIze the oscilloscope settings, thenin the order listed:Sampling head

OH 1 SELECT CHANNEL On/Off11801/11802 Oscilloscope

VertSlze:M1TRIGGER button

SourceMain PoeMain Size

Pulse GeneratorBack Terminator buttonTagger SourceOutput

make the following settings

On

50 mV/dMsionpress

Internal ClockMm

20 ns/dlvision

pull outExternal Trigger

square wave

Examine Dot Response at 250 my with Automatic Calibration Settings—by

performing Steps 2 through 30.

Q Step 2: Set the pulse generator’s amplitude for a 375 mV display.

o Step 3: Set The Vert Offset: Ml so that the step is approximately centeredon the screen.

C Step 4: Press the ENHANCED ACCURACY button, and then touch LoopGain.

fl Step 5: ibuch Automatic Calibrate and then Proceed in the Loop GainCalibration pop-up menu.

o Step 6: Touch Exit in the Loop Gain Calibration pop-up menu.

o Step 7: Set the pulse generator’s amplitude for a 250 mV step display.

o Step 8: Press the WAVEFORM button, and then touch Horizontal Desc.

o Step 9: Touch Main Record Length in the Horizontal Description pop-upmenu, and then set the top knob for a Main Record Length of 512.

D Step 10: Press the UTIUTY button and then instr Options.

~ Step 11: Set Vectored itace to Off In the Instrument Options pop-upmenu.

0 Step 12: Touch Display Intensity in the instrument Options pop-up menu,and then set the top knob for 90% intensity.

~ Step 13: Touch Exit,

o Step 14: Touch Cursors on the top of the screen.

o Step 15: Touch Cursor Type and then Horizontal Bars in the Cursor Typepop-up menu.

SO-24 Service Reference REV NOV 1969 2-9

Part 2 Dot Transient Response

C Step 16: Touch Exit.S C Step 17: Set Cursor 1 (top knob) to the average of the bottom of the pulse

before the step.

C Step 18: Set Cursor 2 (bottom knob) to the top of the step.

o Step 19: Read ~V as the peak-to-peak step amplitude, and then record thisvalue as V for later use.

C Step 20: Press the ENHANCED ACCURACY button.

C Step 21: Touch Loop Gain and then the channel you are using In the LoopGain CalibratIon pop-up menu,

C Step 22: Set the Divide by iwo Mode to On in the Loop Gain Calibrationpop-up menu.

C Step 23: touch Exit in the Loop Gain Calibration pop-up menu,

o Step 24: Touch Cursors at the top of the screen,

C Step 25: Set Cursor 1 to the average of the bottom of the pulse before thestep,

C Step 26: Set Cursor 2 to the average of the bottom of the pulse under the

step.

C Step 27: Read AV, and then record this value as VL for later use, (

C Step 28: Set Cursor 2 to the average of the top of the pulse.

C Step 29: Read AV, and then record this value as VH for later use.

o Step 30: ExamIne that the negative dot response en’or ((—VL/VH) x 100%]is �5%

C Step 31: ExamIne that the positive dot response error (100 % x (Vii--V)/(V—Vt.)] is �5%.

Examine Dot Response at 500 my with Automatic Calibration Settings—byperfonTling Steps 31 through 50.

o Step 32: Press the ENHANCED ACCURACY button.

C Step 33: Touch Loop Gain, and then set Divide by iwo Mode to Off in theLoop Gain Calibration pop-up menu.

C Step 34: Touch Exit.

o Step 35: Set the Vert Slze:M1 to 100 mV/div.

C Step 36: Set the puise generator’s amplitude for a 500 my step display.

o Step 37: Touch Cursors on the top of the screen,

E Step 38: Set Cursor 1 to the average of the bottom of the pulse before the

—— step.

2-10 SEV NOV1989 Checks and Adjustments

Part 2 Dot TransientResponse

C Step 39: Set Cursor 2 to the average of the tO~of the pulse.

C Step 40: Read SV as the peak-to-peak step amplitude, and then record thisvalue as V for later use.


C Step 42: Touch Loop Gain and then the channel number you are using inthe Loop Gain Calibration pop-up menu.

C Step 43: Set Divide by iwo Mode to on in the Loop Gain CalibratIonpop-up menu.

C Step 44: Touch Cursors at the top of the screen.

C Step 45: Set Cursor 1 to the average of the bottom of the pulse before thestep.

o Step 46: Set Cursor 2 to the average of the bottom of the pulse after the

step.C Step 47: Read the AV value, and then record this value as Vt. for later use.

o Step 48: Set Cursor 2 to the average of the top of the pulse.

fl Step 49: Read ~V,and then record this value as VH for iater use.

C Step 50: ExamIne that the negative dot response error R—VL/VH) x 100%]is �5%.

C Step 51: Examine that the positive dot response error (100 % x (VH—V)/(V—VL)] is �5%.

Examine Dot Response at 500 mV with default settings—by performing Steps

51 through 59.


C Step 53: Touch Loop Gain and then Recall Defaults in the Loop GainCalibration pop-up menu.

C Step 54: Touch Exit,

C Step 55: touch Cursors at the top of the screen.

C Step 56: Set Cursor 1 to the average of the bottom of the puise before thestep.

C Step 57: Set Cursor 2 to the average of the bottom of the pulse after thestep.

C Step 58: Read the ~V value, and then record thIs value as Vt. for later use.

C Step 59: Set Cursor 2 to the average of the top of the pulse and read ~V,Record this value as Vii,

80-24 Service Reference REV NOV 1989 2-11

Pafl2 Dot Transient Response

C Step 60: Examine that the magnitude of the negative dot response error[(-VL/VH)x 100%] Is �20%. (

Check Dot Response at 1V with Manual Calibration Settings—by perfomling

Steps 60 through 70.


C Step 62: Touch Loop Gain, and then set the Divide by iwo Mode to Off In

the Loop Gain Calibration pop-up menu.C Step 63: Touch Exit.

C Step 64: Remove the 5X attenuator, and then connect the 2X attenuator tothe channel you are using and the coaxiai cable,

C Step 65: Set the Vert Size:M1 to 200 mv/div.

o Step 66: Set the pulse generator’s amplitude for a 1 v *2% step display.


C Step 68: touch Loop Gain and then the channel number you are using Inthe Loop Gain Calibration pop-up menu.

C Step 69: Set the Divide by iwo Mode to On, and then touch ManualCalibrate In the Loop Gain Calibration pop-up menu.

o Step 70: Thuch Exit. (

C Step 71: Check that the amplitude of the pulse, measured from the averageof the level under the pulse to the average of the top of the pulse, can be setwith the manual calibration settings to be ~1V

C Step 72: Repeat steps 2 through 71 for channel 2.

Checks and Adjustments2-12 REV NOV 1989

Part 3 This part shows the setup and lists the procedure to examine offset and checkOffset offset change with repetition rate.

Measurement LImItSThe measurement limit for the offset is±2my.

SpecificationsThe specification for the offset change with repetition rate Is ±5mV.

Setup to Examine Offset

Procedure to Examine Offset

0 Step 1: InitialIze the oscilloscope settings, then make the following settingsin the order listed:

Sampling headCH 1 SELECT CHANNEL On/Off

11801/11802 OscilloscopeTRIGGER button

SourceENHANCED ACCURACY button

Calibrate All pop-up menu

On

pressinternal Clock

pressRecall Defaults

1,

CH1 50(1 Tem7inaUon

CH 1 50(1TermlnaUQn

Setupto Examine Offset

50-24 Se,vice Reference REV NOV 1989 2-13

Pad 3 Offset

0 Step 2: Touch Offset Null In the ENHANCED ACCURACY major menu.

El Step 3: Touch Manual Calibrate in the Offset Nulllng pop-up menu.

C Step 4: Touch the Offset Null; Ml, select 0, and then Enter In the NumericEntnj & Knob Res pop-up menu.

C Step 5: Touch the vertical icon, and then set Vert Size: Ml to 50 mV/div.

C Step 6: Press the MEASURE button.

o Step 7: Touch Measurements and then Mean in the Measurements pop-upmenu.

C Step 8: Touch Mean in the MEASURE major menu, and then set Datalntervai to whole zone in the Mean pop-up menu.

C Step 9: ExamIne that Mean Is 0 V ±200my.

C Step 10: Press the ENHANCED ACCURACY button, and then touch OffsetNull,

o Step 11: Touch Automatic Calibrate and then Proceed In the OffsetNulling pop-up menu.

0 Step 12: Press the MEASURE button.

C Step 13: Examine that the Mean (offset) IsO ±2my.

o Step 14: Repeat steps 2 through 13 for Channel 2.

(

(

0

2-14 REV NOV1989 Checks and Adjustments

Setup to Check Offset Change with Repetition Rate

Checks and AdjustmentsPart 3 Offset

50(1 Termination

50(1 Termination

Procedure to Check Offset Change with Repetition Rate

C Step 1: Initialize the oscilloscope settings, then make the following settingsin the order listed:


11801/11802 OscilloscopeENHANCED ACCURACY button

Calibrate All pop-up menulime mark generator

Marler (seC)

On


0.2~s

50(1 Termination

Setupto Check Offset Change with Repetition Rote

SD-24 Service Reference Manual

Checks andAdjustmentsPart 3 Offset

E Step 2: Press the TRIGGER button, and then touch Level.

fl Step 3: Set the ~frigLevel until a trace appears.

o Step 4: Touch the Vertical icon, and then set the Veil Size: Ml to 2 mV/dIv.

C Step 5: Set Veil Offset: Ml so that the trace is vertically centered on the

screen.0 Step 6: Set the time mark generator’s marker setting to 10 ms.

fl Step 7: Press the WAVEFORM button, and then touch Acquire Deso.

C Step 8: Set Average N to On, and then touch Set Avg N.

Li Step 9: Set Average N to 8 with the top knob.

C Step 10: Walt until the Acquire Desc selector In the WAVEFORM major

menu shows that eight averages have been completed.C Step 11: Press the MEASURE button.

C Step 12: touch Measurements and then Mean In the Measurementspop-up menu.

C Step 13: Touch Compare & References in the MEASURE major menu.

C Step 14: Touch Save Current Meas Values as References, and then setCompare to On.

0 Step 15: Set the time mark generator’s marker setting to 5 ms. (

C Step 16: Wait until the Acquire Desc selector in the WAVEFORM majormenu shows that eight averages have been completed.

~ Step 17: Check that AMean (offset with a repetition rate) is 0+5 my.

C Step 18: Continue to decrease the time mark generator’s marker setting,and repeat Step 17 for each setting down to 0.1 pS.

C Step 19: Press the CH 2 SELECT CHANNEL button.

o Step 20: Disconnect the 50 (1 termination from the OH 1 input and connect itto the OH 2 Input.

o Step 21: Repeat Steps 4 through 18 for OH 2.

0

2-16 REV JUN 1989 50-24 Service Reference Manual

This part shows the setup and lists the procedures to check noise.

Measurement Limits (SN 5020652 and above)The measurement limit for noise is 1.2 my without smoothing and 550 jiV withsmoothing.Measurement Limits (SN 8020651 and below)

The measurement limit for noise is 2 my wWioUt smoothing and 900 ~Vwithsmoothing.Setup to Examine Noise

r-~II ~JlIL~iL~

c~~

IC-L~-~/

~U~

I~l

U

Lq~J

Procedure to Examine Noise

Li Step 1: Initialize the oscilloscope settings, then make the following settingsin the order listed:

Sampling headCl-Il SELECT CHANNEL On/Off

11801/11802 OscilloscopeTRIGGER button

SourceENHANCED ACCURACY button

Calibrate All pop-up menu

On

pressInternal Clock


Part4Noise

11801CM I 50(1 Termination

/

J 12” RF C~b!e(not connected yet)

CH 1 50(1 7brmlnatlon

12” RF C2bIe

Setup to Examine Noise

SD-24Service Reference REV NOV 1989 2-17

--—.-..-......-.-....iPart 4 Noise

C Step 2: Touch Loop Gain in the ENHANCED ACCURACY major menu.

* 0 Step 3: DIsconnect the 50 11 termination from the Cli 1 Input and connectthe CALIBRATOR to the CH 1 Input through the 12 inch RF cable.

C Step 4: Touch the channel number you are using, Automatic Calibrate, andthen Proceed in the Loop Gain Calibration pop-up menu.

C Step 5: DIsconnect the CALIBRATOR from the CH 1 input and reconnect the50 atemllnatiorl,

C Step 6: Press the WAVEFORM button, and then touch Acquire Desc.

C Step 7: Set Average N to On.

C Step 8: Press the AUTOSET button.

C Step 9: Touch the vertical Icon. If theVeil Size: Ml is not at 2 mV/div, thenset the Veil Size: Ml to 2 mV/div.

[I] Step 10: Touch Def Wa at the top of the screen.

C Step 11: In the Vertical DescrIptIon pop-up menu, touch the followingselectors In the order given:• Mainframe.1

• •Avg( (• Mainframe

.1

.)• Enter Desc

C Step 12: Press the MEASURE button, and then touch Measurements.

C Step 13: Touch RMS In the Measurements pop-up menu, and then RMS Inthe MEASURE major menu.

C Step 14: Set Data Interval to whole zone in the RMS pop-up menu.

C Step 15: Examine that RMS is �1.2my. (SN B020652 and above)Examinethat RMS is �2 my. (SN 8020651 and below)

[J Step 16: Press the WAVEFORM button.

C Step 17: Touch Sampling Head Fnc’s, and then set Smoothing to On In theSampling Head Functions pop-up menu.

C Step 18: Press the MEASURE button,

C Step 19: . Examine that the RMS Is �550~V.(SN B020652 and above)Examine that the RMS is �900~V,(SN B010651 and below).

C Step 20: Repeat steps 2 through 19 for channel 2.

2-18 REV NOV1989 Checks and Adjustments

Checks and Ad/usfments

Rise limeThis part shows the setup and lists the procedure to check the rise time.

SpecificationsThe specification for the sampling head rise time is 17.5 pa.

Setup to

Procedure to Check Rise Time

Step 1: InitIalize the oscilloscope settings, then make the followingin the order listed:

Sampling headCH 1 SELECT CHANNEL On/Off On

Rise lime

Calibration StopGenerator

Calibration StepGenerator

CalibrationStepGenerator

remote head Calibration StepGenerator

powersupply

Setup to Check Rise Time

SD-24 Seivlce Reference Manual


Calibrate All pop-up menuTRIGGER button

SourceCalibration step generator

ON/STANDBY switch

C Step 2: Press the AUTOSET button.

~ Step 3: Press the WAVEFORM button, and then touch Horizontal Desc.

O Step 4: Touch Main Record Length,afld then set Main Record Len to 5120

with the top knob.C Step 5: Touch Acquire Desc In the WAVEFORM major menu.

O Step 6: Set Average N to On, and then touch Set Avg N.

Li Step 7: Set Average N to 128 wIth the top knob.

C Step 8: Touch the horizontal icon, and then set the Main Size to 100 na/div.

Li Step 9: Touch Main Pos and then Set to Mln in the Numeric Entry & KnobRes pop-up menu.

Li Step 10: Press the MEASURE button.

O Step 11: Touch Measurements and then Rise In the Measurements pop-up (menu.

~ Step 12:Off in the

C Step 13:

C Step 14:

O Step 15:

O Step 16:pulse 10

Li Step 17:step is at

C Step 18:

C Step 19:screen.

O Step 20:

~ Step 21:

Checks aridAdjustmentsPart 5 Rise Time

i (.!.~.1pressRecall Defaults

pressInternal Clock

ON

Touch Rise in the MEASURE major menu, and then set Wacklng to

Rise pop-up menu.

Set the Main Size to S ns/div,

Touch Baseline In the Rise pop-up menu.

Touch a blank portion of the screen to exit this menu.

Set the Baseline (bottom knob) to the average of the bottom of thens before the step.

Touch the horizontal icon, and then set the Main Pos so that thethe left-most edge of the screen.

Set the Main Size to 20 ps/div.

Set the Main Pos so that the step is approximately centered on the

Touch Rise in the MEASURE major menu.

Record the Mean: value in the Rise pop-up menu tar later usa

2-20 REV JUN 1959 SD-24 Service Reference Manual

Pan 5 Rise Time

Li Step 22: Calculate the sampling head rise time with the following formula:

sampling head — J(Mean : value)2 - (Calibration Step Generator rise)2

rise time —

Note that Calibration Step Generation rise is read from the calibration stepgenerator.

0

O Step 23:

C Step 24:

Check that the sampling head rise time is �17.5 ps.

Repeat steps 2 through 23 for channel 2.

SD-24 Service Reference REV NOV 1989 2-21

Checksand Adjustments

—7% � aberration % �12%

—4% C aberration % �4%

-1.2% � aberration % <1.2%

-0.6% � aberration % �O,6%

—4% � aberration % �~%

Part6AcquisitionAberrations

This part shows the setup and lists the procedures to check acquisitionaberrations.

Measurement LimitsThe measurement limits for acquisition aberrations are listed in ThbIe 2-3,Aberrations Specifications.

Tabie 2-3

Time Difference from the Minimum Specification

Rising Edge of Waveform

Oto300ps

300 ps to 5 ns

— Aberrations Specifications

5 nato 100 ns

100 ns and up

—lonsto—2Ops

S

(

(

(c

2-22 REV JUN 1989 SD-24 Setv/ce Reference Manual

S

S

Setup to Examine Acquisition Aberrations

11801

Checks ~ndAdjustmentsPart 6 Acquisition Aberrations

Procedure to Examine Acquls Won Aberrations

Li Step 1: Initialize tile oscilloscope settings, then make the following settingsin the order listed:

Sampling headCH1 SELECT CHANNEL On/Off On

11801/11802 OscIlloscopeENHANCED ACCURACY button press

Calibrate All pop-up menu Recall DefaultsTRIGGER button press

Source Internal ClockCalibration step generator

ON/STANDBY switch OF’1

Li Step 2: Press the WAVEFORM button, and then touch AcquIre Desc.


remote head CailbratIon StepGenerator

powersupply

11802


remote head Calibration StepGenerator

powersupply

Setup to Examine Acquisition Aberrations

St~24Se,vice Reference Manual REV JUN 1989 2-23

Checks andAdjustmentsPart 6 Acquisition Aberrations

fl Step 3: Set Average N to On, and then touch Set Avg N,

S Li Step 4: Set Average N to 128 wIth the top knob,

E Step 5: Press the AUTOSET button.

fl Step 6: Touch the horizontal icon, and then set the Main Size to 100 na/div.

fl Step 7: Set the Main P05 so that the rising edge of the step is at theleft-most edge of the screen.

Li Step 8: Touch the vertical icon, and then set the Veil Oftset:M1 so that theaverage of the top of the pulse from 100 ns after the step to the right edge ofthe screen is at the horizontal centerline.

0 Step 9: Set the Vert Size: Ml to 2 mV/div.

Li Step 10: Touch Veil Offset: Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.

~ Step 11: Set Veil Offset: Ml so that the average of the top of the pulsefrom 100 ns after the step to the right edge of the screen Is at the horizontalcenterline.

Li Step 12: Examine that The magnitude of the maximum positive and negativeaberration occurrIng 1 OOns after the step is �0.75vertical divisions from thehorizontal centerline (0.6% of the step amplitude).

Li Step 13: Toucfl the horizontal Icon, and then set the MaIn Size to ions/div.

Li Step 14: Set the Main Pos so that the rising edge of the step is at the (ieft-rnost edge of the screen.

fl Step 15: Examine that The magnitude of the maximum positive and negativeaberration occurring 5 ns to 100 ns after the step is �i 5 vertical divisionsfrom the horizontal centerline (1.2% of the step amplitude).

Li Step 16: Set the Main Size to 500 ps/div and then the Main Pos so that therising eage of The step is at the left-most edge of the screen.

Li Step 17: Examine that the magnitude of the maximum positive and negativeaberration occurrIng 300 ps to a ns after the step is �5.Overtical divisionsfrom the horizontal centerline (4-0% of the step amplitude).

~ Step 18: Touch the horizontal icon, and then set the Main Size to 500 ns/div.

~ Step 19: Touch the vertical icon, and then set the Veil Slze:M1 to 10 mV/div.

Li Step 20: Set the yen Offset:M1 so that the average of the top of the pulsefrom 100 ns after the step to the right edge of the screen is at the horizontalcenterline.

fl Step 21: Touch the horizontal icon, and then set the Main Size to 50 pa.

Li Step 22: Set the Main Pos so that the rising edge of the step Is at the

left-most edge of the screen,

S

2-24 REV JUN 1989 SD-24 Sen’ice Reference Manual

Part 6AcquIsitionAberrations

0

Li Step 23: Examine that the magnitude of the maximum positive aberratIonoccurring in the first 300 ps after the step is �3.0vertical divisions from thehorizontal centerline (12% of the step amplitude).

Li Step 24: ExamIne that the magnitude of the maximum negative aberrationoccurring in the first 300 pa after the step Is �i .75 vertical divisions from thehorizontal centerline (7% of the step amplitude),

Li Step 25: Thuch the Main Pos selector and then Set to Mm In the NumericEntry and Knob Res pop-up menu.

Li Step 26: Set the Main Size to 10 na/div.

Li Step 27: Touch the vertical icon, and Then set Veil Offset:M1 so that theaverage of the bottom of The pulse 10 ns before the step is at the horizontalcenterline.

Li Step 28: Touch the horizontal icon, and then set the Main Size to 1 ne/div.

Li Step 29: Set the Main P03 so that the rising edge of the step Is at theright-most edge of the screen.

El Step 30: Examine that the magnitude of the maximum positive and negativeaberration occurring iOns to 500 pa before the 10% point of the step is�1.0 vertIcal divisions from the horIzontal centerline (4% of the stepamplitude)

E Step 31: Set the MaIn Size to 50 ps/div and then the MaIn Pos so that therising edge of the step Is at the right-most edge of the screen.

Li Step 32: Examinethat the magnitude of the maximum positive and negativeaberration occuning 500 psto 20 ps before the 10% point of the step is�1 .0 verticai dMsions from the horizontal centerline (4% of the stepamplitude)

El Step 33: Repeat steps2 through 32 for channel 2.

SD-24 Service Reference RE~NOV 1989 2-25


CoincidenceBetween Channels

This part shows the setup and lists the procedures to check the coincidencebetween channels.

SpecificationsThe specification for the coincidence between channels is lOps,

Setup to Check CoIncidence Between Channels

Procedure to Check Coincidence Between Channels

Li Step 1: initialize the oscIlloscope settings, then make the followingin the order listed:

Sampling headCH 1 SELECT CHANNEL On/Ott On

Calibration StepE~ønørato,




Check Coincidence Between Channels

~SD-24ServiceReference Manual

Checks and AdjustmentsPart 7 CoIncidence Between Channels

11801/11802 OsculoscopeENHANCED ACCURACY button


SourceCalibration step generator

ON/STANDBY switch

~ Step 2:

E Step 3:

LI Step 4:with the

LI Step 5:

LI Step 6:

~ Step 7:

Eli Step 8:connectbutton.

~ Step 9:

LI Step 10:

~ Step ii:Acquire

LI Step 12:

fl Step 13:

screen.~ Step 14: Press the STORE/RECALL button.

LI Step lb: Touch Trace 2 in the Store Trace pop-up menu.

LI Step 16: Touch Recall Trace In the STORE/RECALL major menu.

LI Step 17: Touch STO I in the Recall Stored Trace pop-up menu.

~ Step 18: Disconnect the calibration step generator remote head tram CR2,connect it to CH 1, and then press the CR 1 SELECT CHANNEL On/Offbutton.

LI Step 19: Press the MEASURE button.

fl Step 20: TouCh Measurements and then Prop Delay in the Measurementspop-up menu.

~ Step 21: Touch Prop Delay in the MEASURE major menu and then Trace 3ri the Prop Delay pop-up menu.

LI Step 22: Check that the magnitude of the Prop Delay is �10 p5.


pressInternal Clock

ON

Press the AUTOSET button.

Press the WAVEFORM button, and then touch Horizontal Desc.

Touch Main Record Length, and then set Main Record Len to 1024top knob.

Touch Acquire Desc in the WAVEFORM major menu.

Set Average N to On, and then touch Set Avg N.

Set Average N to 64 with the top knob.

Disconnect the calibration step generator remote head from OH 1,it to OH 2, and then press the CR 2 SELECT CHANNEL On/Off

S

0

Press AUTOSEt

Select the horizontal Icon, and tnen set the Main Size to 10 ps/div.

Touch Acquire Desc, and then set Average N to On In theDescription pop-up menu.

Touch Exit,

Set the Main Pos so that the step is approximately centered on the

50-24 Service Reference Manual REV JUN 1989 2-27


Maximum Signal voltage.Voltage

Trigger Input

Trigger Input

This part shows the setup and lists the procedure to examine the maximum s~gna~

Measurement Limit

The measurement limit for the maximum signal voltage is 1% of th~stepamplitude.

Setup to Examine Maximum Signal Voltage

LJa] _i

~ULLTuggerOu~.ut

50 C~CoaxialCablef6si Rise

PositiveOutput

FastRise50 fl Coaxial Cable Po~ith~eOutput

Setup to Examine Maximum Signal

SD-24 Service A~lerenceManual

Checks and AdjustmentsPart B Maximum Signal Voltage

Procedure to Examine Maximum Signal Voltage

S LI Step 1: nitialize the oscilloscope settings, then make the following settingsIn the order listed:

Sampling headOH 1 SELECT CHANNEL On/Ott.. On

11801/11802 OscIlloscopeENHANCED ACCURACY button press

Calibrate All pop-up menu Recall DefaultsTRIGGER button press

Slope -MaIn Size 5 ~s/dlv

Calibration generatorAmplitude maximum amplitudePeriod lOILsVar adjustment mid range

fl Step 2: Touch the vertical Icon, and then set the Vert Offset: Ml so that thewaveform is vertically centered on the screen.

LI Step 3: Set the calibration generator’s amplitude so that it displays a 1 Vpeak-to-peak square wave.

LI Step 4: Touch the horizontal icon, and then set the Main Size to 500 ns/div.

LI Step 5: Set the Main Pos so that the positive-going step is near theleft-most edge of the screen (within 1/2 division).

LI Step 6: Press the WAVEFORM button.

LI Step 7: Touch Acquire Deso, and then set Average N to On in the AcquireDescription pop-up menu.

LI Step 8: Touch Set Avg N,and then set Average N to 128 with the tO~knob.

LI Step 9: Touch the vertical icon, and then set the Veil Offset: Ml so that theaverage of the top of the pulse 500 ns after the step is on the horizontalcenterline.

LI Step 10: Set Vert Slze:M1 to 5 mV/div.

fl Step 11: Touch Veil Offset Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.

~ Step 12: Set Veil Offset: Ml so that the average of the top of the pulse 500ns after the step is on the horizontal centerline.

LI Step 13: Set the Main Size to 200 ns/div.

LI Step 14: Examine that the magnitude of the maximum positive and negativeaberration from 200 ns to 800 ns from the rising edge of the step is �2vertical divisions uom the horizontal centerline (1 % of the step amplitude).

fl Step 15: Touch the horizontal icon, and then set the Main Size to 20 ns/div.

50-24 Service Reference Manual REV JUN 1989 2-29

Checksand AdjustmentsPail B Maximum Signal Voltage

E Step 16: Set the Main Pos so that the step is near the left-most edge of thescreen (within 1/2 division) (

E Step 17: Examinethat the magnitude of the maximum positive and negativeabelTation from 10 ns to 200 ns from the rising edge of the step is �2verticaldivisions torn the horizontal centerline (1% of the step amplitude).

E Step 18: Repeat all of Part 8 for CH 2.

S.

C

2-30 REV JUN 1989 SD-24ServiceReference Manual


Isolation BetweenChannels

Sofl Termination

This part showsthe setup and lists the procedures to check the isolation bet’Neenchannels.

Specifications

The measurement limit for the isolation between channels is

Setup to Check Isolation Between Channels

Procedure to Check Isolation Between Channels

Step 1: Initialize the oscilloscope settings, thenin the order listed:

Sampling headC11 1 SELECT CHANNEL On/Off

the following settings

On



Calibration£fepGenecatorpowerwpply

check Isolation Between Channels

SD-24 Se,vic~Peference Manual

Checks and Adjus~nent~Pail 9 Isolation Between Channels

11801/11802 OscIlloscopeENHANCED ACCURACY button press (

Calibrate All pop-up menu ......,.....,.. Recall DefaultsTRIGGER button press

Source Internal ClockCalibration step generator

ON/STANDBY Switch ON

[] Step 2: Press the AUTOSET button.

~ Step 3: Touch the horizontal icon, and then set the Main Size to 200 ps/dIv.

~ Step 4: Press the WAVEFORM button, and then touch Horizontal DeSc.

~ Step 5: •lbuch Main Record Len9th, and then set Main Record Len to 1024with the top knob.

~ Step 6: Touch AcquIre Desc In the WAVEPORM major menu.

El Step 7: Set Average N to On, and then touch Set Avg N In the AcquireDescription pop-up menu.

~ Step 8: Set Average N to 1024 with the top knob.

[I] Step 9: Press the CH 2 SELECT CHANNEL button on the sampling head.

~ Step 10: Touch the vertical icon, and then set the Vert Size: M2 to 2 mV/div.

~ Step 11: Touch Acquire Desc in the WAVEFORM major menu, and then set (Average N to On.

~ Step 12: Wait until the Acquire Dasc selector in the WAVEFORM majormenu shows that 1024 averages have been completed.

~ Step 13: Touch the MEASURE button.

~ Step 14: TOuch Measurements and then Peak-Peak In the Measurementspop-up menu,

~ Step 15: Record the OH 2 Peak-Peak measurement for later use.

El Step 16: PresstheCH 1 SELECTCHANNEL button.

Li] Step 17: Touch Measurements and then Peak-Peak in the Measurementspop-up menu.

~ Step 18: Record the OH 1 Peak-Peak measurement for later use.

LI Step 19: Check that (CH 2 Peak-Peak/OH 1 Peak-Peak) x 100% �1%.

E Step 20: Disconnect the calibration step generator remote head from OH 1and the 50 fl termination from CH 2. Connect the calibration step generator toOH 2, connect the 50 (~termination to OH 1, and then press the CH 2SELECT CHANNEL On/Off button,

S~ Step 21: Press the AUTOSET button.

~ Step 22: TouCh the horizontal icon, and then set the Main Size to 200 pS/div.

2-32 REV JUN ~989 S~-24Sen//ce Reference Manual

Part 9 IsolatIon Between Channels

El Step 23: Press the Cl-I 1 SELECTCHANNEL button.

S ~ Step 24: Press the AUTOSE~button.

El Step 25: Press WAVEFORM button.

El Step 26: Wait until the Acquire Desc selector in the WAVEFORM majormenu shows that 1024 averages have been completed.

El Step 27: Press the MEASURE button.

[J Step 28: Touch Measurements and then Peak-Peak in the Measurementspop-up menu.

El Step 29: Record the CH 1 Peak-Peak measurement for later use,

D Step 30: Press the Cl-I 2 SELECT CHANNEL button.

Q Step 31: Record the OH 2 Peak-Peak measurement for later use.

El Step 32: Checkthat (CM 1 Peak-Peak/0H2 Peak-Peak) x 100% �1%.

S

SD-24 Serv/ce Reference SEV NOV 1989 2-33


S

Part 10 This part shows the setup and lists the procedures to check the output amplitude.Output Amplitude

SpecificationsThe specification for the output amplitude is 250 my ±5my.

Setup to Check Output Amplitude

11801CH I

I /

CH 1 sonToimination11802

rjiII -‘II -fl

L~L~)~

..b

IC—sJ-~-~-H irn;

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Setup to Check OutputAmplitude

Procedure to Check Output AmplItude

El Step 1: Initialize the oscilloscope settings, then make the foilowing settingsin the order listed:

Sampling headCM 1 SELECT CHANNEL On/Off..

11801/11802 OscilloscopeENHANCED ACCURACY button . -

Calibrate All pop-up menu . . -

TRIGGER buttonSource

El Step 2: Press the WAVEFORM button,

On

pressRecall Detaults

pressInternal Clock

and then touch Acquire Desc.

S

sOCTennination

Lc1~/ ~-

L~l~jLp.b[~m

C.

CS El Step 3: Set Average N to On, and then touch Set Avg N

2-34 REV JUN 1989 SD-24Sen//ce Reference Manual

Past10 OutputAmplitude

El Step 4: Set Average N to 64 with the top knob.

S El Step 5: Touch Sampling Head Fnc’s in the WAVEFORM major menu, andthen set the Clii TDR to On.

El Step 6: Press the AUTOSET button.

El Step 7: Touch the horizontal Icon, and then set the Main Size to 100 ns/dlv,

El Step 8: Touch Main Pos and then Mm In Main Pos pop-up menu.

El Step 9: Press the ENHANCED ACCURACY button,and then touch TDRAmplitude.

El Step 10: Touch AutomaticCalibrate andthen Proceed in the TDRAmplitude pop-up menu.

El Step 11: Touch Cursors at the top of the screen.

o Step 12: Touch Cursor Type and then HorIzontal Bars.

El Step 13: Touch Exit to exit this menu.

El Step 14: Set Cursor 1 (top knob) to the average of the base of the pulse.

El Step 15: Set Cursor 2 to the average of the top of the pulse 100 ns after the

step.o Step 16: CheckthatAVls2sOmV±5mV,

(5 El Step 17: Press the WAVEFORM button.

D Step 18: Touch Sampling Head Fnc’s, and then set the TDR Polarity to —

in the SamplIng Head Functions pop-up menu.o Step 19: Touch Exit to exit this menu.

El Step 20: Touch the vertical icon and set the Veil Offset; Ml so that the step

is centered on the screen.El Step 21: Touch Cursors at the tO~of the screen.

~ Step 22: Set Cursor 1 (top knob) to the average of the base of the pulse.

0 Step 23: Set Cursor 2 to the average of the top of the pulse 100 ns after thestep.

El Step 24: Check that .SV is -250 mV ±5my.

El Step 25: Repeat all of Part 10 for CH 2.

0

5D-24 Serv/ce Reference REV NOV1989 2-35


Partii This part shows the setup and lists the procedures to check the TOR aberrat%ons.TDR Aberrations

SpecificationsThe specifications for TDR aberrations are listed in Table 2-4, AberrationsSpecifications,

Table2-4 — Aberrations Specificat/ons

S

S

Time Difference fromthe Rising Edge ofWaveform

MinimumSpecification

Measurement Limit

Oto300ps . —5% �aberration�i 5%

%

Soopstosns -3%�aberration%0%

5 ns and up ‘—1% � abeiTation 96±1%

-ions to —20 Ps —3% � aberration %�3%

.4

(

(.

2-36 REV JUN 1989 SD-24Serv/ce Reference Manual

Checks and AdjustmentsPart 11 TDR Aberrations

LJ~/ ~i

L L[L~I~J L!J1

Procedure to Check TDR Aberrations

i:i~Step 1: InitIalize the oscilloscope settings, then make the following settingsin the order listed:Sampling head

CH1 SELECT CHANNEL On/Off .. •.......... On11801/11802 Oscilloscope

ENHANCED ACCURACY button pressCalibrate All pop-up menu Recall Defaults

TRIGGER button pressSource Internal Clock

Press the WAVEFORM button, and then touch Acquire Desc.

Set Average N to On, and then touch Set Avg N.

Set Average N to 128 with the top knob.

Touch Sampling Head Fnc’s in the WAVEFORM major menu, andthe CM 1 TDR to On in the Sampling Head Functions pop-up menu.

Press the ENHANCED ACCURACY button, and then tOuch TDR

Step 2:

Step 3:

Step 4:

Step 5:then set

Step 6:Amplitude.

(5Setup to Check TDR Aberrations

11801CM I 50 ~ITermination

/

CM 1 50(~Terrni,,e.rlon

Setupto CheckTOR Aberrations

ElElElEl

El

SD-24 ServiceReference Manual REV JUN 1989 2-37

Part 11 rDR Aberrations

Li Step 7: Touch Automatic Calibrate and then Proceed in the TDRAmplitude pop-up menu.

Li Step 8: Press vie AUTOSETbutton.

Li Step 9: Touch the horizontal icon, and then set the Main Size to 100 na/div.

Li Step 10: Set the Main Pos so that the rising edge of the stepis at theleft-mostedge Ot the screen.

Step 11: Touch the vertical icon, anø then set the Veil Offset:M1 so that theaverage of the top of the pulse 100 ns after the step is at the horizontalcenterline,

fl Step 12: Set the Veil Size: Ml to 2 mV/div.

Li Step 13: Touch yen Offset: Ml and then Fine in the Numeric Entry & KnobRes pop-up menu.

Li Step 14: Set Veil Offset: Ml so that the average of the top of the pulse100 ns after the step Is at the horizontal centerline.

Li Step 15: Touch the horizontal icon, and then set the Main Size to 10 ns/dlv.

Li Step 16: Set the Main Pos so that the rising edge of the step l~at theleft-most edge of the screen.

Li Step 17: Check that the magnitude of the maximum positive and negativeaberration occurring 5 ns after the step to the right edge of the screen is

�1.25 vertical dMsions from the horizontal centerline (1% of the stepamplitude).

Li Step 18: Set the Main Size to 500 ps/div7 and then set the Main Pos so thatthe rising edge of the step Is at the left-most edge of the screen.

Li Step 19: Check that the magnitude of the maximum positive and negativeaberration occurring 300 ps to 5 ns alter the step is �3.75vertical divisionsfrom the horizontal centerline (3% of the step amplitude).

Li Step 20: Touch the horizontal icon, and then set the Main Size to 500 ne/div.

Li Step 21: Touch the vertical icon, and then set the Veil Slze:M1 to 10 mV/div.

Li Step 22: Set the Veil Offset:M1 so that the average of the top of the pulse100 ns after the step is at the horizontal centerline.

Li Step 23: Touch the horizontal icon, and then set the Main Size to 50 ps/div.

Li Step 24: Set the Main Pos so that the rising edge of the step is at the’left-most edge of the screen.

Li Step25: Examine that the magnitude ot the maxImum positive aberrationoccurring in the fIrst 300 ps after the 90% point of the step is �3.75verticaldivisions from the horizontai centerline (15% of the step amplitude).

2-38 REV JUN 1989 Checks andAdjustments

Part•11 TDR Aberrations

S

Step 26: ExamIne that the magnitude of the maximum negative aberrationoccurring in the first 300 PS after the 90% point of the step Is �1.25 verticaldivisions from the horizontal centerline (5% of the step amplitude).

E Step 27: Set The Main Size to 2 ns/cliv,

E Step 28: Touch the Main Pos selector and then Set to Mm In the NumericEntry and Knob Flea pop-up menu.

D Step 29: Touch the vertical icon, and then set yen Oflset:M1 so that theaverage of tne bottom of the pulse 10 ns before the step is at the horizontalcenterline.

fl Step 30: Touch the horizontal icon, and then set the Main Size to 1 ns/div.

Step 31: Set the Main P03 50 that the rising edge of the step is at the

right-most edge of The screen.E Step 32: Check that the magnitude of The maximum positive and negative

aberration occurring iOns to 500 ps betore the 10% point of the step is �1 .0vertical dMsions from the horizontal centerline (4% of the step amplitude).

D Step 33: Set the Main Size to 50 ps/div and then the Main Pos so that therising edge of the step is at the right-most edge of the screen.

[~ Step 34: Check that the magnitude of the maximum positive and negativeaberration occurring 500 pa to 20 ps before the 10% poInt of the step is ~1.0vertical dMsions from the horizontal centerline (4% of the step ampiitude)

C) Step 35: Press the WAVEFORM button.

C) Step 36: Touch Sampling Head Fnc’s, and then set the TDR Polarity to - in

the Sampling Head Functions pop-up menu.C) Step 37: Repeat Steps 2 Through 36.

SD-24 Sesv!ce Reference REV NOV 1989 2-39


6~Precision Semi-Rigid Cable

Precision ShortC(rcuit Termination

This part shows the setup and lists the procedures. to check the reflected risetime.

Specifications

The specification for the reflected rise time is 35 ps.

Setup to Check Reflected Rise Time

CM I

r Precision Semi-Rigid Cable

Precision She,1 Chcuit Thm,ination

Procedure to Check Reflected Rise lime

C) Step 1: initialize the oscilloscope settings, thenin the order listed:

(




Source

On

Part12Reflected Rise Time (.

CH I

Setupto CheckReflectedRiseTime

make the following settings

pressRecau Defaults

pressInternal Clock

2-40 REV JUN 1980 StJ~24ServiceReference M~fluaI

Pan 12 Reflected Rise Time

Li Step 2: Press the WAVEFORM button,and then touch Acquire Dese.

Li Step 3: Set Average N to On, and then touch Set Avg N.

Q Step 4: Set Average N to 128 with the top knob.

~ Step 5: Touch Sampling Head Fno’s from the WAVEFORM major menu, and

then set the (*11 TOR to On.Li Step 6: Press the AUTOSET button.

Li Step 7: Touch the horizontal icon, and then set the Main Size to 5 ns/div.

Q Step 8: Touch the Main Pos selector and Then Set to Mm in the Numeric

Entry and Knob Rn pop-up menu.Li Step 9: Press the MEASURE button, and then touch Measurements.

Li Step 10: Touch Fall In the Measurements pop-up menu and then Faii In theMEASURE major menu.

Li Step 11: Set tacking to Off, and then touch Thpllne in the Fail pop-upmenu,

Li Step 12: Touch lbpiine In the MEASURE major menu and then Fine in theNumeric Entry & Knob Res pop-up menu.

Li Step 13: Set the Toplmne (top knob) so that It is 250 my above the Baseiine.

Li Step 14: Touch the horizontal icon, and then set the Main Pos so that thereflection step is at the left-most edge of the screen.

fl Step 15: Set the Main Size to 20 ps/div and then the Main Pos to centerreflection step on the screen.

Li Step 16: Check that Fall (reflected rise time) is �35PS.

Li Step 17: Press the WAVEFORM button.Li Step 18: Toucfl Sampling Head Fnc’s, and then set the TDR Polarity to —

in the Sampling Head Functions pop-up menu.

Li Step 19: Touch Exit.

Li Step 20: Repeat Steps 6 through 16 for a negative TDR pulse, Note that allFali selections must be replaced with Rise selections for a negative TDRpulse.

fl Step 21: Repeat steps 2 through 20 for channel 2.

.2-41SO-24Service Reference REV NOV 1989

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