Matrix 620B - OPERATION METHOD; 4.1 Introduction of Front Panel

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4.OPERATIONMETHOD
4.1IntroductionofFrontPanel
CRT:.
POWER...............................(7)
Mainpowerswitchoftheinstrument.Whenthisswitchisturnedon,theLED(6)isalsoturnedon.
INTEN.................................(2)
Controlsthebrightnessofthespotortrace.
FOCUS................................(3)
Forfocusingthetracetothesharpestimage.
TRACEROTATION..............(4)
Semi-fixedpotentiometerforaligningthehorizontaltraceinparallelwithgraticulelines.
FILTER................................(36)
Filterforeaseofwaveformviewing.
CHl(X)input..........................(9)
VerticalinputterminalofCH1.WheninX-Yoperation,X-axisinputterminal.
CH2(Y)input..........................(20)
VerticalinputterminalofCH2.WheninX-Yoperation,Y-axisinputterminal.
AC-GND-DC..........................(10)(18)
Switchforselectingconnectionmodebetweeninputsignalandverticalamplifier.
AC:ACcoupling
GND:Verticalamplifierinputisgroundedandinputterminalsaredisconnected.
DC:DCcoupling
VOLTS/div.............................(8)(21)
Selecttheverticalaxissensitivity,from5mV/divto20V/divin12ranges.
VerticalAxis:
VARIABLE.......................(13)(17)
Fineadjustmentofsensitivity,withafactorof>1/2.5oftheindicatedvalue.WhenintheCALposition,sensitivityis
calibratedtoindicatedvalue.
POSITION.................(11)(19)
Verticalpositioningcontroloftraceorspot.Whenthisknobispulledout(x5MAGstate),theamplifiersensitivityis
multipliedby5.
VERTMODE.....................(14)
SelectoperationmodesofCHlandCH2amplifiers.
CH1:Theoscilloscopeoperatesasasingle-channelinstrumentwithCH1alone
CH2:Theoscilloscopeoperatesasasingle-channelinstrumentwithCH2alone.
DUAL:Theoscilloscopeoperatesasadual-channelinstrumentbothCH1andCH2.
ADD:Theoscilloscopedisplaysthealgebraicsum(CHl+CH2)ordifference(CH1-CH2)ofthetwosignals.
ThepushedinstateofCH2INV(16)buttonisforthedifference(CHl-CH2).
ALT/CHOR...........................(12)
Whenthisswitchisreleasedinthedual-tracemode,thechannellandchannel2inputsarealternatelydisplayed(normally
usedatfastersweepspeeds).
Whenthisswitchisengagedmthedual-tracemode,thechannel1andchannel2inputsarechoppedanddisplayed
simultaneously(normallyusedatslowersweepspeeds).
CH2INV................................(16)
InvertstheCH2inputsignalwhentheCH2INVswitchmodeispushedinThechannel2inputsignalinADDmodeand
thechannel2triggersignalpickoffarealsoinverted.
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