Teledyne 9060Z Oxygen Equipment User Manual

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Model9060ZManual

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10.INSTRUMENTCALIBRATION

10.1CALIBRATIONSUMMARY

The9060Zoxygentransmitterhasaselfcalibrationanddiagnosticsystembuiltintothehardwareand

software. Once the reference voltages have been set into memory the self calibration system

maintainsthecalibrationofthetransmitter.Anautomaticupdateofthezeroandspanisdoneevery

minute.

The4‐20mAoutputscanbeautomaticallycalibratedwiththepressoftheAUTOCALkeyormanually

finetuned.

Oneentryforeachprobeoffsetisrequiredtooptimisethecalibrationoftheoxygenmeasurement

although an automatic system calibration check can be programmed into the transmitter using

certifiedgasses.

10.1.1CALIBRATIONOFTHEINPUTS

Thecalibrationoftheanalogueinputsisbasedonthevoltageofatemperaturecompensatedvoltage

referenceintegratedcircuit.Thereare4voltagesgeneratedfromthestandardreferencevoltage.

Theywillvarybyabout1%fromonetransmittertoanotherbutcanbetrimmedbysettingtheactual

voltagesintoCALIBRATIONmenufunctions#1to4.

Thecalibrationsh

ouldbedone30minutesormoreaftertheinstrumenthasbeenon,approximately

onceeveryyear.Thecalibrationconstantsareretainedinbatterybackedmemoryunlessa‘COLD

START’isperformed.Seechapter10.2,ColdStart.

Connecta31/2digitmultimeternegativeleadtothetestpointmarked‘COM’inthecentreofthe

1732‐1PCB(labeled‘V‐REFS’).Measurethefourvoltagesonthetestpointmarked1to4withthe

positiveleadofthemultimeter.EnterthemeasuredvaluesintheCALIBRATIONmenufunctions#1to

4.Whenevernewvaluesareentered,theD/ASectionshouldbere‐calibrated.Seechapter10.1.2.

10.1.2CALIBRATIONOFTHEOUTPUTS

Theeasiestwaytocalibratetheoutputsistoselect‘AutoCalibrated’inCALIBRATIONmenufunctions

#5and8.Ifthisisselectedtheoutputswillbedirectedawayfromtheoutputterminalsandbackinto

ananalogue input of the transmitter. The outputs are then testedand a zero and span calibration

factor is recorded. If a more accurate calibration is required select ‘Manually Calibrated’ in

CALIBRATIONmenufunctions#5and8.Thiswillinhibittheautomaticcalibrationsystemoverwriting

thecalibrationfactors.However,thezeroandspanfactorswillneedtobemanuallyset.Tosetthe

calibrationfactorsusethefollowingstepsforeachoutput:

1. SelectCALIBRATIONmenufunction#5(8)andsettheoptionto‘Calibrate4mA’.

2. UsetheFUNCTIONupkeytogotofunction#6(9).

3. Setthisto4.00mAandpresstheENTERkey.

4. Measuretheactualoutputcurrentwithadigitalmultimet

er.

5. Use theOPTION keys to set the option to the value read on the digital multimeter and press

ENTER.

6. Theoutputshouldgoto4.00mA.Thevalueinfunction#6(9)canbefinetunedifnecessary.

7. Gobacktofunction#5(8)andselect‘Calibrate20mA’.

8. Gouptofunction#7(10)andsettheoptionvalueto20.00mA.

9. Measuretheactualoutputcurrentwithadigitalmultimeter.

10. Use the OPTION keys to set theoption to the value read on the digital multimeter and press

ENTER.

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Teledyne 9060Z Oxygen Equipment User Manual