Fluke 35040 manual Battery Care, Using Other Ion Chambers

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35040

Operators Manual

NOTE

Use the predicted timed charge or dose measurement to diagnose a problem at the onset of a timed measurement for sources that deliver at a constant exposure rate. If the predicted timed measurement is drastically different from the expected value, there is no reason to wait for the complete timer interval to expire before investigating the cause of the discrepancy.

NOTE

To differentiate the predicted and non-predicted timed measurements, the instrument alternates the display of time with a “PREDICT” indicator on the predicted timed

measurement lines.

3.7.4 Using Other Ion Chambers

You may make measurements using electrical units of coulombs and amperes and manually calculate the radiological values from known ion chamber and air density factors. Or you may use the Customization software to add the new ion chamber’s description and calibration factor to the list available for DETECTOR SELECT. See Section 3.10 for details.

3.8 Battery Care

To maximize both the life and the performance from the rechargeable battery, deep discharge should be avoided. The battery will maintain peak performance through out the life of the product if the following practices are adopted.

1.Store the instrument connected to the AC line power source if possible. This will maintain the batteries at their full charge level and insure that the instrument is ready to go anytime it is needed.

2.If the instrument cannot be connected to AC line power during storage, fully recharge the batteries at the beginning of the storage interval and store the instrument at 25°C or less if possible. For extended storage, fully recharge the batteries at least annually to compensate for their self- discharge characteristics. Decrease the time between maintenance recharges by one-half for each 10°C increase in the storage temperature above the 25°C baseline.

3.If possible, begin charging the batteries as soon as the “LoBat” annunciator appears and avoid setting the automatic power down interval to a value greater than 15 minutes so that the batteries will not become fully discharged if the instrument is left unattended.

4.Charge the batteries immediately if the instrument is allowed to operate to the 5.4 V automatic power down level. This will avoid self-discharge to levels below which an extended recovery period may be required.

5.If the instrument is used primarily from battery power, provide an extended charging period (24 hours or longer) for every 5 to 10 fast charge cycles.

The instrument will not operate when the battery voltage is below the 5.4 V automatic cutoff level. If the battery voltage level is allowed to drop below this level due to self-discharge, an extended charge period on the order of hours may be required to bring the voltage up to the 5.4 V level. During this period, the

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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 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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