Fluke 35040 manual Decimal Places, Timer Setup

Page 84

35040

Operators Manual

B.4.4 Timer Setup

The Test Function screen provides for configuring the timer interval, count mode, and decimal places (see Figure B-6).

With the timer settings displayed, press the TEST FUNCTION button. The "" cursor will appear to the left of the timer interval setting. Use the UP and DOWN arrow buttons to select a value from the user customizable list. Refer to Section B.7 for details on programming the timer intervals.

ADC	ALC
Interval:	60 s
Count: UP	0
Decimal Places:	0

Figure B-6. The Test Function Screen Showing the Timer Settings

Press the TEST FUNCTION button to advance the "" cursor to the timer count mode field. Use the UP and DOWN arrow buttons to toggle the setting between up (UP) and down (DOWN). For the up count mode, the timer starts at zero (0) seconds and increments up to the timer interval setting. The down count mode displays time starting from the timer interval setting and decrements to zero (0) seconds.

Press the TEST FUNCTION button to advance the "" cursor to the timer decimal places setting. Use the UP and DOWN arrow buttons to toggle the setting between zero (0) and one (1). Zero decimal places displays time in whole seconds, while one decimal place displays time to a tenth of a second.

NOTE

Presently, the timer counts only in whole seconds.

B.4.5 Reset Error (with Automatic Leakage Compensation Enabled)

The following discussion is only applicable when automatic leakage compensation is enabled and the ion chamber is calibrated in Coulombs.

Holding the RESET/MEASURE button while on the Measurement screen causes the Model 35040 Therapy Dosimeter to reset the electrometer, zero all readings, and restart the measurement process. When an exposure is detected immediately following the reset that was not present prior to the reset, the

ADCALC

Internal Reset Error

Press RESET/MEASURE

and Repeat Exposure

instrument displays the reset error message shown in Figure B-7.

Figure B-7. The Measurement Screen Showing the Reset Error Message

To remove the error message, end the exposure and hold the RESET/MEASURE button. Wait a few seconds for the instrument to complete the reset and repeat the exposure.

B-8

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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 Specifications Factory Calibration Error Source ± %rdgMaximum Error Manual AddendaFull Scale Range Display Resolution Noise ± counts Full Scale Range Display ResolutionTimed Charge Measurements 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 DescriptionPower Supply Front PanelMicroController Serial Communications PortBasic Operating Equations ElectrometerBias Supply Multiplexer and A/D ConverterQuantity Description Units Comments QExposureQAccum QAccumpreviousCharge and Current Measurements Leakage Measurements= time of electrometer conversion s Exposure Charge and Dose Timed Charge and DoseSetting Thresholds Predicted Timed Charge and DoseAccumulated 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 MaximumSetup SetupFront Panel Familiarization 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 ChambersPower Battery CareOperation Instructions 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 Reset Error With Automatic Leakage Compensation Enabled AnnunciatorsAnnunciators Annunciator ConditionMeasurement Indicators and Conditions Indicator Measurement Condition? left of value Condition Overranged MeasurementInstalling/Uninstalling Customization Software CustomizationConnection to the Computer 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 LineUsing the APPEND, DELETE, and Insert Buttons Display Line Group SelectionSelecting an Item and Placing It Changing a Line on a DisplayTimer Intervals 38. The Timer Intervals FormBias Settings 39. The Bias Settings FormExamples Changing the Pressure Units Customizing a Measurement DisplayAppending a Display Deleting a DisplayErrors Troubleshooting and Service TroubleshootingSymptom Display does not light up when Power is pressed Symptom ??Bias annunciator displayedSymptom HiBias annunciator displayed Symptom LoBias annunciator displayedSymptom Internal Reset Error displayed Symptom Configuration Error displayedBit Description Action Do not makeSymptom Current Overrange Displayed Symptom Dashes displayed instead of digitsSymptom Bias voltage measurement changes by one digit 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 Warranty Information Replaceable Parts ListRecalibration, Repair Information & Technical Assistance 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