Fluke 35040 manual Bias Error, Go to, Line

Page 66

35040

Operators Manual

4.5 Bias Error

 

 

 

Go to

 

 

 

line:

1.

Is "??Bias" displayed?

YES

2

NO

6

 

 

2.

Has the instrument been on for more than one minute?

YES

3

NO

8

 

 

3.

Turn off the power. Wait 10 seconds. Turn on the power. Wait 1 minute. Is

YES

4

"??Bias" displayed?

NO

--

 

4.

PROBLEM: Electrometer fault. See Section 4.10.

YES

5

NO

--

 

 

5.

Change the bias voltage to a different setting and then change back. Wait

 

 

about 10 seconds. Is the error on the display?

 

 

 

 

 

 

Change the bias voltage to 0.0 V. Disconnect all triax cables. Cap the

YES

7

6.

connectors. Change bias voltage to desired setting. Wait about 10 seconds.

NO

8

 

Is the error on the display?

 

 

 

7.

Change the bias voltage to 0.0 V. Examine the triax connectors on the

 

 

instrument, both front and rear, for foreign matter. Is foreign matter present?

 

 

 

 

 

8.

See Section 4.7.

YES

9

NO

18

 

 

9.

Normal operation established.

YES

10

NO

11

 

 

10.

Do you use a separate cable to connect the ion chamber to the instrument?

 

 

 

 

 

 

 

Change the bias voltage to 0.0 V. Connect only the cable to the instrument.

YES

12

11.

Change the bias voltage to the desired setting. Wait about 10 seconds. Is the

NO

13

 

error on the display?

 

 

 

12.

PROBLEM: Bias fault in cable. See Section 4.10.

 

 

 

 

 

 

 

Change the bias voltage to 0.0 V. Connect the ion chamber. Change the bias

YES

14

13.

voltage to the desired setting. Wait about 10 seconds. Is the error on the

NO

16

 

display?

 

 

 

14.

PROBLEM: Bias fault in instrument. See Section 4.10.

YES

15

NO

17

 

 

15.

PROBLEM: Bias fault in ion chamber. See Section 4.10.

 

 

 

 

 

 

16.

This message is displayed until the signals from the isolated side are valid.

 

 

 

 

 

 

4-8

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Page 65 Page 67
Contents 35040 Therapy DosimeterFluke Biomedical Table of Contents Troubleshooting and Service Addendum Features of Firmware Version 27JAN00 or LaterSample Customization Reports Iii Blank Features IntroductionIntroduction Before You Start Safety Precautions Safety Symbols And TermsOperators Manual Maximum Error SpecificationsFactory Calibration Error Source ± %rdg Manual AddendaTimed Charge Measurements Full Scale Range Display Resolution Noise ± countsFull Scale Range Display Resolution Current MeasurementsSpecifications Effective Exposure Time MeasurementsGeneral Measurements High Performance Power Supply and Battery Charger Unpacking and Inspection 35040 Hardware Block Diagram of the Model 35040 Therapy Dosimeter Functional DescriptionMicroController Power SupplyFront Panel Serial Communications PortBias Supply Basic Operating EquationsElectrometer Multiplexer and A/D ConverterQAccum Quantity Description Units CommentsQExposure QAccumpreviousCharge and Current Measurements Leakage Measurements= time of electrometer conversion s Exposure Charge and Dose Timed Charge and DoseAccumulated Charge and Dose Setting ThresholdsPredicted Timed Charge and Dose Exposure Current and RateExposure Time DoseRate = I a × Iccf Units/C × Adcf × RateMultiplier sAir Density Correction Factor ⎝ PMm Hg = inch Hg x Standard Resolution Error Units Display Minimum MaximumFront Panel Familiarization SetupSetup IntroductionPowering The System Rear Panel FamiliarizationPower-Up Self-Test and Display Messages Ion Chamber ConnectorBasic Measurement Techniques General ConsiderationsMaking Non-Timed Exposure Measurements Timer Setup Timer Use3Making Timed Exposure Measurements Battery Care Using Other Ion ChambersOperation Instructions PowerBattery Care Front Panel ControlsPowering Up the Model 35040 Therapy Dosimeter Powering Down the Model 35040 Therapy Dosimeter Using the Test Function ButtonOperation Instructions QScaleFactor=1.0000 IScaleFactor=1.0000 12. The Test Function Screen Showing the Timer Settings 5Automatic Leakage CompensationCalibrated by Keithley RMD Nov 15 6Timer Setup 17. The Test Function Screen Showing the Timer SettingsUsing the Detector Select Button Using the AIR Density ButtonUsing the Units Select Button Using the Bias Select ButtonSet 300.0 V 100% Central Electrde Pos IC Bias 300.0 V CEP Using the RESET/MEASURE Button Overranging ConditionsReset Error Overrange ConditionsCondition Values Overranged Annunciators Reset Error With Automatic Leakage Compensation EnabledAnnunciators Annunciator Condition? left of value Measurement Indicators and ConditionsIndicator Measurement Condition Condition Overranged MeasurementConnection to the Computer Installing/Uninstalling Customization SoftwareCustomization Starting the Customization SoftwareDownloading Menu Items and ControlsCOM Port Drop Down List Ion Chambers Close or File CloseFile Save AS and File Print Edit OK and Cancel Special ItemsDownload and Cancel 36. The Special Items Menu Calibration Temperature has focusMeasurement Displays Operators Manual Available Display Lines Display LineSelecting an Item and Placing It Using the APPEND, DELETE, and Insert ButtonsDisplay Line Group Selection Changing a Line on a DisplayTimer Intervals 38. The Timer Intervals FormBias Settings 39. The Bias Settings FormExamples Appending a Display Changing the Pressure UnitsCustomizing a Measurement Display Deleting a DisplayErrors Troubleshooting and Service TroubleshootingSymptom HiBias annunciator displayed Symptom Display does not light up when Power is pressedSymptom ??Bias annunciator displayed Symptom LoBias annunciator displayedBit Description Action Symptom Internal Reset Error displayedSymptom Configuration Error displayed Do not makeSymptom Bias voltage measurement changes by one digit Symptom Current Overrange DisplayedSymptom Dashes displayed instead of digits Measurements. ReturnExample 299.9 to Display Will Not Light Low Battery Hours? Is the battery voltage greater than 5.9 volts?Bias Error Go toLine Line Fuse Replacement Model 35040 Therapy Dosimeter Fuse ReplacementInterface Connector Cleaning Cleaning The InstrumentReplaceable Parts Information Recalibration, Repair Information & Technical Assistance Warranty InformationReplaceable Parts List Replaceable Parts InformationBlank Sample Customization Reports Sample Documents35040 Appendix Sample Customization Reports 35040 Appendix Sample Customization Reports Blank Introduction New Features OverviewTimed Measurements Specifications Update Setup New Features BTimer Setup Procedure Timer Use ProcedureMaking Timed Exposure Measurements RESET/MEASURE Setup BADC ALC Automatic Leakage CompensationStart NA pA Stop Thres Current Operation Instructions BTimer Setup Decimal PlacesAnnunciators, Indicators, and Overrange Conditions Table B-2. Measurement Indicators and ConditionsTable B-1. Annunciators Table B-3. Overrange Conditions Condition Overranged Measurement1Theory Of Operation Theory of OperationConfiguration Error Service Required Error Number Main Menu Measurement MenuMeasurement Displays Figure B-9 shows the Measurement Displays dialog box Table B-4. Available Display Lines Figure B-10. The Timer Intervals dialog box Page Fluke Biomedical
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