Fluke 35040 manual Making Timed Exposure Measurements, Timer Setup Procedure, Timer Use Procedure

Page 80

35040

Operators Manual

Procedure

•The annunciator line on the Measurement screen displays "WAIT System Not RDY" while the instrument is acquiring the minimum number of samples required for leakage compensation. Wait for this message to disappear.

•Wait for the leakage current to return to the nominal value.

•Make the exposure.

When the instrument senses that the exposure is over, it displays and holds the exposure measurements and then resets the electrometer (refer to Section B.4.3 for information on configuring the start and stop thresholds). The exposure measurements are displayed until either the RESET/MEASURE button is held for one second, the bias voltage or threshold changed, or another exposure is started.

B.3.2 Making Timed Exposure Measurements

The timer is available when any of the measurement displays contains a timed measurement. Refer to Section B.7 for information on customizing measurement displays.

Timer Setup

Procedure

•Use the TEST FUNCTION button, along with the UP and DOWN arrows to display the Timer Setup screen.

•To modify the timer setup, press the TEST FUNCTION button to display the "" cursor at the timer interval field and use the UP and DOWN arrows to select a timer interval from the programmed list. (Refer to Section B.7 for information on how to program the interval list.)

•Press the TEST FUNCTION button to advance the "" cursor to the timer count mode field and use the UP and DOWN arrow keys to select up (UP) or down (DOWN) for the count mode.

•Press the TEST FUNCTION button to advance the "" cursor to the timer decimal places field and use the UP and DOWN arrow keys to select zero (0) or one (1).

•Press the TEST FUNCTION button to hide the cursor and save any changes. Proceed to using the timer, which is discussed next.

Timer Use

Procedure

•Press the RESET/MEASURE button to show the Measurement screen if it is not displayed.

•To start or manually stop the timer, press the RESET/MEASURE button while the instrument is updating other exposure measurements (e.g., charge and current). The instrument displays the “Tmr” annunciator when the timer is running.

NOTE

The instrument will not permit the timer to be started while leakage is being measured.

•Upon completion of the timer interval or if the instrument senses the exposure is over (applicable when automatic leakage compensation is enabled), the instrument ceases updating the timed measurements.

NOTE

Use the predicted timed charge or dose measurement to diagnose a problem at the onset of

B-4

Page 79 Page 81
Image 80
Page 79 Page 81
Contents 35040 Therapy DosimeterFluke Biomedical Table of Contents Sample Customization Reports Troubleshooting and ServiceAddendum Features of Firmware Version 27JAN00 or Later Iii Blank Introduction FeaturesIntroduction Operators Manual Before You Start Safety PrecautionsSafety Symbols And Terms Specifications Factory Calibration Error Source ± %rdgMaximum Error Manual AddendaFull Scale Range Display Resolution Noise ± counts Full Scale Range Display ResolutionTimed Charge Measurements Current MeasurementsGeneral Measurements SpecificationsEffective Exposure Time 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 QAccumprevious= time of electrometer conversion s Charge and Current MeasurementsLeakage Measurements 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 sMm Hg = inch Hg x Air Density Correction Factor⎝ P Standard Resolution Error Units Display Minimum MaximumSetup SetupFront Panel Familiarization IntroductionPowering The System Rear Panel FamiliarizationPower-Up Self-Test and Display Messages Ion Chamber ConnectorMaking Non-Timed Exposure Measurements Basic Measurement TechniquesGeneral Considerations 3Making Timed Exposure Measurements Timer SetupTimer Use Battery Care Using Other Ion ChambersPower Battery CareOperation Instructions Front Panel ControlsPowering Up the Model 35040 Therapy Dosimeter Operation Instructions Powering Down the Model 35040 Therapy DosimeterUsing the Test Function Button 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 ConditionsCondition Values Overranged Reset ErrorOverrange Conditions 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 SoftwareCOM Port Drop Down List DownloadingMenu Items and Controls File Save AS and File Print Ion ChambersClose or File Close 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?Line Bias ErrorGo to Line Fuse Replacement Model 35040 Therapy Dosimeter Fuse ReplacementReplaceable Parts Information Interface Connector CleaningCleaning The Instrument 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 Timed Measurements Introduction New FeaturesOverview Specifications Update Setup New Features BMaking Timed Exposure Measurements Timer Setup ProcedureTimer Use Procedure RESET/MEASURE Setup BADC ALC Automatic Leakage CompensationStart NA pA Stop Thres Current Operation Instructions BTimer Setup Decimal PlacesTable B-1. Annunciators Annunciators, Indicators, and Overrange ConditionsTable B-2. Measurement Indicators and Conditions Table B-3. Overrange Conditions Condition Overranged Measurement1Theory Of Operation Theory of OperationConfiguration Error Service Required Error Number Measurement Displays Main MenuMeasurement Menu 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
Top Page Image Contents