Fluke 90100 manual Line Fuse Replacement, Dose Rate Measurement Zero Problem Flowchart

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Maintenance & Service

Troubleshooting 4

Dose Rate Measurement Value Does Not Return to Zero in the Absence of a Radiation Beam

WARNING

The Model 35360A TRACKER Display and 35300A Detector contain no internal operator serviceable parts. Disassembly of either unit could result in electrical shock.

Always turn the 35360A TRACKER Display's power off prior to connecting or disconnecting the interface cable.

Failure to do so may result in an electrical shock.

When powering the 35360A TRACKER Display from

an AC line, always use a 3-wire grounding type line cord such as the one supplied with the 90100 TRACKER System.

In addition, only connect the 35360A TRACKER Display to an AC power outlet employing a third wire safety ground.

One or more dose rate measurement values do not return to within one count of zero in the absence of radiation.

Switch 35360A TRACKER Display to the dose measurement mode

and check for excessive leakage drift.

No	Dose measurement leakage drift	Yes
	greater than 2 counts per minute?

The problem appears to be caused by one or more improper A-D Zero setting. Use the TRACKER Customization Software to readjust the A-D Zero setting for each

drifting channel.

The problem appears to be caused by current leakage in one or more measurement channels. Use the Dose Leakage Troubleshooting chart, Figure 5-4, to further diagnose the problem.

Figure 5-5 Dose Rate Measurement Zero Problem Flowchart

4.3 Line Fuse Replacement

WARNING

Disconnect the 35360A TRACKER Display from other equipment along with the AC line power and turn off power before continuing with this section.

4-7

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Contents Tracker System ModelFluke Biomedical Table of Contents Customization Maintenance and ServiceAppendix a Using Build-Up Theory of OperationIntroduction General InformationModel FeaturesManual Addenda Before You Start Safety PrecautionsSafety Terms SpecificationsIon Chamber Factory Calibration Nominal Ion Chamber CharacteristicsMechanical Specifications Recommended Operation ConditionsElectrometer / A-D Converter Measurements ModeDisplay Mode Model 35360A Tracker DisplayEnvironment High Performance Battery ChargerUnpacking and Inspection Interface Cable Detector to DisplayOptional Equipment Standard System ContentsBlank Rear Panel Familiarization OperationDetector Input Powering the SystemDisplay. Be sure to use the correct end of the cable 3 RS-232 Computer Interface RJ-45 Style Positioning the Model 35300A Detector in the BeamOperation Positioning the Model 353300A Detector in the Beam Front Panel Controls Operation InstructionsUnits Select PowerReset Test/DetectorPowering Down the Model 35360A Tracker Display Powering Up the Model 35360A Tracker DisplayUsing the TEST/DETECTOR Button Test/Detector Screen 2 Ion Chamber Calibration Factors Using the Units Select ButtonUsing the Gain Select Button Normal Mode Using the AIR Density ButtonAbsolute Measurements Using the Measure Select Button Normal ModePercent-of-Center Measurements Underranging and Overranging Conditions Battery and Bias Annunciators24. Positions of the Battery and Bias Annunciators Gain Setting ModeAborting the Fpgf Changes Saving the Fpgf ChangesBlank Theory of Operation Hardware Block Diagram of the Model 35360A Tracker Display Power SupplyVFD Display Front Panel Switches2 300-VOLT Electronic Bias Supply ProcessorElectrometer Serial Communications PortMultiplexer and A/D Converter Air Density Corrections Model 35300A Ion Chamber DetectorsBasic Operating Equations Basic Operating Quantities Blank Maintenance & Service Problem TroubleshootingNo Display Flowchart Low battery Yes Annuciator displayed? Low Battery Indication at the Display35360A Tracker Bias Error LoBias or HiBias Indication at the DisplayLeakage Flowchart Dose Rate Measurement Zero Problem Flowchart Line Fuse ReplacementIf fuses continue to blow return instrument for repair Cleaning the Instrument Interface Connector CleaningReplaceable Parts Information Recalibration & Repair Information / Technical Assistance Replaceable Parts ListCustomization Screen Formats Make a Working DiskConnection to the Computer Starting the Customization SoftwareDisplay Customization Items Screen Appearance F10 Exit F1 Help On-Line Help for using the Customization softwareF2 Edit Item Editing F6 Print Report PrintingDefinitions Ion Chamber Calibration Factor Iccf Setting the Electrometer Gains and OffsetsCharge Gain QG Current Gain, Current Zero IG and ADZElectrometer Charge Gains QG Electrometer Current Gain IGUsage Examples Changing the Power Down IntervalChanging the ION Chamber Calibration Factor Units Input Errors ErrorsBuild-Up, Peg, and Retainer Kit Options Using Build-UpNominal Number of build-up Solid Water Appendix Fluke Biomedical