Jandel RM3000 - Page 21

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JandelRM3000Calibration

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2. RemovethelidusinggreenOKWkey.Ensuretopushontherelevantslot

positionsasshownintheimagesbelow.

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3. EnterattheTerminal:999.99uflzAfterashortdelay,theunitwillchangeto

current999.99uAmps,FWDmode,LOWmodeandhaszeroeditself.

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4. ConnectVR2torear4mmsocketsandconnecta1Kresistorplug.Locate

potentiometerVR2.AdjustpotuntiltheexternalDVMreads1V+/‐500uV.

Sendan‘x’.Theunitreplieswiththefollowing:

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CalibrationSet1.000V

Factor3372.57Success

SelectFWDChangetoHIandcheckZERO

ThenPressx

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Thismessagecouldalsodisplay‘failed’ifthecalculatedfactorisoutofrange

(the1vrefwasout)

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5. Theunitnowchangesitsrangeto100uA(althoughtheLCDisnotupdated).

ThereadingontheexternalDVMshouldnowbeadjustedto100mVusing

VR2.Itshouldbepossibletotrimthisintowithin+/‐10uV.

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6. Sendanother‘x’.Theunit’sreplyisasfollows:Factorxxxxx.Thistime,ifthe

calculatedfactoristoofarout,theunitwillrefusetotakethesecond‘x’

commandandsothesystemwillneedtobepoweredoff,investigatethe

faultandstartagain.

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7. ThesecondlineoftheLCD(voltagereading)nowbecomesimportant.Send:

‘lz’totheunit.Nowcheckthatthe1000mVreadingontheLCDagainstthe

externalDVM.TheLCDreadingneedstobewithin+/‐800uV.Ifnot,the

procedurefrom3)willneedtoberepeatedwithmoreaccuracyandcare.