Fluke 35040 manual Using the Detector Select Button, Using the AIR Density Button

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35040

Operators Manual

3.9.8 Using the DETECTOR SELECT Button

Pressing the DETECTOR SELECT button displays the Detector Select screen, see Figure 3-18. This screen displays information about the selected ion chamber calibration factor. An ion chamber consists of two text lines and an ion chamber calibration factor (ICCF) with units. All ion chambers are entered and can be modified via the Customization Software.

The “f” cursor points to the first description string of the selected chamber. Use the UP arrow to select the next ion chamber and the DOWN arrow to select the previous ion chamber.

ADC

Farmer - S/N 12345

Co-60

ICCF=4.678E+09 R/C

Figure 3-18. The Detector Select Screen

The ion chamber calibration unit (R/C shown here) includes the radiological measurement unit (R). This is the radiological unit that appears on the Measurement screens.

NOTE

The ion chamber’s calibration unit includes the radiological measurement unit.

If you want radiological units that are not available, use the Customization software (see Section 3.10) to enter a new ICCF with the appropriate units.

The descriptive text should contain enough information to let the operator correctly select an ICCF that is appropriate for the measurement desired, e.g. energy, modality, build up, etc.

3.9.9 Using the AIR DENSITY Button

Pressing the AIR DENSITY button displays the Air Density screen, see Figures 3-19 and 3-20. This screen contains the temperature value, pressure value, and Air Density Correction Factor (ADCF). Press the AIR DENSITY button to advance the “f” cursor to the next field. To change the value or state of an item at the “f” cursor, use the UP and DOWN arrows. The Model 35040 Therapy Dosimeter displays the Air Density Correction (ADC) annunciator in the upper left-hand corner of all screens if the air density correction is enabled, see Figure 3-19.

ADC	760 mmHg
22.5 C

ADCF = 1.002

Figure 3-19. The Air Density Screen With Air Density Corrections Enabled

To disable the air density correction, advance the “f” cursor to the ADC annunciator at the upper left of the display. With the “f” cursor at this position, pressing the UP and DOWN keys will toggle the air density correction on (ADC) and off (OFF).

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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 Maximum Error SpecificationsFactory Calibration Error Source ± %rdg Manual AddendaTimed Charge Measurements Full Scale Range Display Resolution Noise ± countsFull Scale Range Display Resolution 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 DescriptionMicroController Power SupplyFront Panel Serial Communications PortBias Supply Basic Operating EquationsElectrometer Multiplexer and A/D ConverterQAccum Quantity Description Units CommentsQExposure QAccumprevious= time of electrometer conversion s Charge and Current MeasurementsLeakage Measurements 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 sMm Hg = inch Hg x Air Density Correction Factor⎝ P Standard Resolution Error Units Display Minimum MaximumFront Panel Familiarization SetupSetup 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 ChambersOperation Instructions PowerBattery Care 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 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 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 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?Line Bias ErrorGo to Line Fuse Replacement Model 35040 Therapy Dosimeter Fuse ReplacementReplaceable Parts Information Interface Connector CleaningCleaning The Instrument 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 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