Jandel RM3000 - Page 22

JandelRM3000Calibration
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8. RemovetheexternalDVMconnectionsastheloadingimpedancecancause
thereadingstochange.
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9. Type100uhzTheLCDwillchangetoareadingof100mVandgointoHImode.
AdjustVR4untiltheLCDreads100.00mV.
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10. Type999.99uflztheunitwillnowgobackto999.99uA,LOWmode.Re‐adjust
VR2untiltheLCDreads999.99mV.Notethat9)and10)areinteractivein
termsoftheadjustmentsandwillbothneedtoberepeateduntilboth
readingsarecorrect.Theallowederroris999.81000.2inlowmodeand
99.97100.03mVinHImode.
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11. Theunitisnowcalibratedtotherequiredaccuracy.However,thecurrent
sourcecanbeoutofspecattheextremeendsofitsrange(10nA,100nAand
10mAranges)andadjustmentsarenecessaryfortheserangesusingthe
softwareadjustments.Fitthe100Rtestresistorplug.
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12. Send‘10mflz’.Afterashortdelay,theunitwillchangeto10mA,LOWmode
andzeroitself.
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13. Send‘@’Theunitwillaskforavalueofbetween‐127and+128.This
arbitraryvaluewillcauseasmalladjustmentinthecurrentoutputandthe
resultcanbeseenontheLCD/voltagereading.Theadjustmentisnon‐
accumulativesokeepsending‘@’followedbyavalueuntilthedisplayreads
1000mV.Theacceptableerroris999.81000.2
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14. Send‘z’,ensurethereadingisstillintheacceptableerrorrangeafterazero.
Ifnot,repeat13).
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15. Removethe100Rtestplugandreplacewith1Mtestplug.Send‘10nfhz’.
(10nA,HImodewithaZero)
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16. Usingthe‘@’command,adjustthisrangetoreadapprox10.02.Wewould
preferthatthisrangedoesnotreadbelow10.Theacceptablerangeis10.00
10.05.Smallfluctuationswillbeseenwiththisreadingasthewetting
currentintothe1Mresistorissosmall.Temperatureaffectsthisrange
dramaticallyandsoensureit’scalibratedafteratleast15minutesofbeing
poweredon.Usually,thefirstpartoftheproceduretakeslongeranyway.
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17. Send‘100nz’.Repeat16)withtheacceptablerangebeing999.97100.03.
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18. Removethe1MtestPlugandReplacewith100R.PresstheTESTbuttonon
thekeypanel.Theunitwillnowtestitselftoensuretheaccuracyofthe
calibration.
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