oscilloscopes: 2 types, analog,digitial see appendix i analog: directly applies the voltage being...
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Oscilloscopes: 2 TYPES, ANALOG,DIGITIALSEE APPENDIX i
ANALOG:DIRECTLY APPLIES THE VOLTAGE BEING MEASURED TO AN ELECTRON BEAM WHICH MOVES UP, DOWN AND ACROSS THE CRT SCREEN.
DIGITIAL: SAMPLES INPUT WAVEFORM AND USES A TO D CONVERTER TO CHANGE VOTLAGE INTO DIGITAL INFORMATION.
DIGITAL OSCOPES HAVE MOSTLY REPLACEDANALOG SCOPES.SMALLER,LIGHT WEIGHT4 CHANNELMULTIPLE MENU.
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LIGHTWEIGT DIGTIAL LCD OSCOPE, GREAT FOR TROUBLESHOOTING IN CRAMPED SPACES
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Illustration showing the interior of a cathode-ray tube for use in an oscilloscope. Numbers in The picture indicate:
1.Deflection voltage electrodes 2.Electron gun
3.Electron beam 4.Focusing coil
5.Phosphor-coated inner side of the screen
MAKE presents: The Oscilloscope http://www.youtube.com/watch?v=SxZWcku_Sw0
Old school analog
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CYCLE P.203: ONE WAVEFORM THAT DOES NOT REPEAT ITSELF
½ CYCLE
PERIOD (T) : TIME TO COMPLETE ONE CYCLE.( IN THIS CASE .25 SECONDS)
.25 S
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SAME THING
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FREQUENCY( f ) : # OF CYCLES/SECOND
Time (sec) FOR THIS WAVEFORM f = 1 CYCLES/SEC
HERTZ: UNIT OF FREQUENCY . FOR THE ABOVE WAVEFORM f = 1 Hz f =1/T OR f =1/λ
AMPLITUDE: (a) HEIGTH OF THEWAVEFORM.
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=1/T = 1/20ms = 1/.002 = 500Hz
EXAMPLE: FIND THE FREQUENCY FOR THE WAVE FORM BELOW.
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ANALOG SCOPES MAKE 2 BASIC MEASUREMENTS, AMPLITUDE AND TIME.
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TYPICAL WAVEFORMS THAT CAN BE SEEN ON AN OSCOPE
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TRIGGERING: USES THE SAME TRIGGER POINT ON A CONTINUOUS WAVE FORM TO CREATE A STABLE DISPLAY.
You tube: Oscilloscope Tutorial Part 1 - Choosing an oscilloscope http://www.youtube.com/watch?v=qIfo_-d82Co
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TYPES OF PROBES
TIMES ONE PROBE( X1) (SHIELDED WIRE)
TIMES TEN PROBE (X10)(LOW CAPACITANCE PROBE)
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YOU TUBE: Oscilloscope Tutorial Part 2 - Basic usage http://www.youtube.com/watch?v=hUIgAu3QQWQ
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FUNCTION GENERATOR
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BASIC MEASUREMENTS WITH OSCOPESVPP=# OF VERTICAL DIVISIONS x VOLT/DIVISIONT (PW) = # OF HORIZONAL DIVISIONS x SECOND/DIVISION
f = 1/T VRMS =VPP/2 X .707
PW: PULSE WITDHNONSINUSOIDAL WAVE FORMS (PULSES)
PULSEWIDTH
prt
PULSE REPETITION TIME (prt)
PULSE REPETITION FREQUENCY (prf)
prf = 1/prt
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SCOPE SETTINGSX: SEC/DIV = 0.2 MS/DIVY:VOLT/DIV = 0.5 V/DIV
SET SIG. GEN. TO SAWTOOTHF =1KHz AT 1.7 Vp AMPLITUDE
FROM SCOPE SCREEN COUNT VpK SHOULD
BE 3.4 VERTICAL DIV X 0.5V/DIV VpK=1.7VVPP=2xVPK=2X1.7V=3.4V
T = 5 HORZ. DIV X 0.2MS/DIV = 1ms
f = 1/T =1/1ms =1KHz
.5
1.0
1.5
2.0FIND Vpp, T ,f OF THE DISPLAYED WAVEFORM
.2 .4 .6 .8 X
Y
YOU TUBE: Oscilloscope Tutorial Part 3 - Advanced functions http://www.youtube.com/watch?v=g_KuGEh0PyA
3.4
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FROM SCOPE FIND PW, prt, Vpk
SET SIG. GEN. TO SQUARE WAVEAMPLITUDE = 20VF = 125 KHz
SCOPE SETTINGX: SEC/DIV = 1us/DIVY: V/DIV = 5V/DIV
PW = 4 HORZ. DIV X 1us/DIV = 4us
prt = 9.6 HORZ. DIV X 1us/DIV = 8us
KHzf
Hzxf
Hzxf
usprtf
125
1025.1
10125.
8/1/1
5
6
us1 2 3 4
5
10
15
20
YOU CAN CONFIRM THIS RESULT
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LISSAJOUS PATTERNSARE MADE BY APPLYING TWO AC SIGNALS TO THE HORZ. AND VERT. INPUTS OF AN OSCOPEAT THE SAME TIME. SET THE TIME DIVISION SWITCH TO X/Y POSITION ON THE OSCOPEWITH THE TWO FUNCTION GENERATORS SET TO THE SAME FREQUENCY, A CIRCLE SHOULDAPPEAR ON YOUR OSCOPE.
1:1
YOU TUBE: Function Generator Tutorial http://www.youtube.com/watch?v=mLKPwWGBtIw
WITH 1FUNCTION GENERATOR
WITH 2 FUNCTION GENERATORS
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Basics of Lissajous Patterns on an Oscilloscope http://www.youtube.com/watch?v=t6nGiBzGLD8
http://www.youtube.com/watch?v=U8bXpzppdR0Oscilloscope for iPad, iPhone and iPod touch
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FREQUENCY RATIO
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