Oscilloscopes: 2 TYPES, ANALOG,DIGITIAL SEE 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 REPLACED ANALOG SCOPES. SMALLER,LIGHT WEIGHT 4 CHANNEL MULTIPLE MENU.

LIGHTWEIGT DIGTIAL LCD OSCOPE, GREAT FOR TROUBLESHOOTING IN CRAMPED SPACES

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 Oscilloscopehttp:// Old school analog

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

SAME THING

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 THE WAVEFORM.

=1/T = 1/20ms = 1/.002 = 500Hz EXAMPLE: FIND THE FREQUENCY FOR THE WAVE FORM BELOW.

ANALOG SCOPES MAKE 2 BASIC MEASUREMENTS, AMPLITUDE AND TIME.

TYPICAL WAVEFORMS THAT CAN BE SEEN ON AN OSCOPE

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

TYPES OF PROBES TIMES ONE PROBE( X1) (SHIELDED WIRE) TIMES TEN PROBE (X10) (LOW CAPACITANCE PROBE)

YOU TUBE: Oscilloscope Tutorial Part 2 - Basic usagehttp://

FUNCTION GENERATOR

BASIC MEASUREMENTS WITH OSCOPES V PP =# OF VERTICAL DIVISIONS x VOLT/DIVISION T (PW) = # OF HORIZONAL DIVISIONS x SECOND/DIVISION f = 1/T V RMS =V PP/2 X.707 PW: PULSE WITDH NONSINUSOIDAL WAVE FORMS (PULSES) PULSE WIDTH prt PULSE REPETITION TIME (prt) PULSE REPETITION FREQUENCY (prf) prf = 1/prt

SCOPE SETTINGS X: SEC/DIV = 0.2 MS/DIV Y:VOLT/DIV = 0.5 V/DIV SET SIG. GEN. TO SAWTOOTH F =1KHz AT 1.7 V p AMPLITUDE FROM SCOPE SCREEN COUNT V p K SHOULD BE 3.4 VERTICAL DIV X 0.5V/DIV Vp K =1.7V V PP =2xV PK =2 X 1.7V=3.4V T = 5 HORZ. DIV X 0.2MS/DIV = 1ms f = 1/T =1/1ms =1KHz FIND Vpp, T,f OF THE DISPLAYED WAVEFORM X Y YOU TUBE: Oscilloscope Tutorial Part 3 - Advanced functionshttp:// 3.4

FROM SCOPE FIND PW, prt, V pk SET SIG. GEN. TO SQUARE WAVE AMPLITUDE = 20V F = 125 KHz SCOPE SETTING X: SEC/DIV = 1us/DIV Y: V/DIV = 5V/DIV PW = 4 HORZ. DIV X 1us/DIV = 4us prt = 9.6 HORZ. DIV X 1us/DIV = 8us us YOU CAN CONFIRM THIS RESULT

LISSAJOUS PATTERNS ARE MADE BY APPLYING TWO AC SIGNALS TO THE HORZ. AND VERT. INPUTS OF AN OSCOPE AT THE SAME TIME. SET THE TIME DIVISION SWITCH TO X/Y POSITION ON THE OSCOPE WITH THE TWO FUNCTION GENERATORS SET TO THE SAME FREQUENCY, A CIRCLE SHOULD APPEAR ON YOUR OSCOPE. 1:1 YOU TUBE: Function Generator Tutorial WITH 1FUNCTION GENERATOR WITH 2 FUNCTION GENERATORS

Basics of Lissajous Patterns on an Oscilloscopehttp:// Oscilloscope for iPad, iPhone and iPod touch

FREQUENCY RATIO