Fluke 90100 manual Basic Operating Equations

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Model 90100

Operators Manual

Pressure		Temperature

mm Hg = inch Hg ∗ 25.4		K = (5/9) ∗ (°F -32) - 273.15
mm Hg = 760 ∗ (54,041	- feet ASL) / (54,041 + feet ASL)	K = °C + 273.15

mm Hg = 760 ∗ (16,472	- meters ASL) / (16,472 + meters ASL)
mm Hg = mB ∗ 0.75006

mm Hg = hPa ∗ 0.75006

3.5 Basic Operating Equations

This section lists the basic operating equations used within the 35360A TRACKER Display to produce its dose and dose rate measurement values for display on the VFD. These equations are expressed in terms of a set of basic operating quantities which are described in Table 3-3.

3.5.1 Charge

Although charge is not a value which can be displayed directly by the 35360A TRACKER Display, it is an intermediate result upon which the dose value directly depends.

Q [nC] = (ADC [counts] - ADZ [counts] ) ⋅ QG [nC/count]

3.5.2 Current

Although current is not a value which can be displayed directly by the 35360A TRACKER Display, it is an intermediate result upon which the dose rate value directly depends.

I [nC/Min] = (ADC [counts] - ADZ [counts]) ⋅ IG [(nC/Min)/count]

3.5.3 Absolute Dose

Q [nC]⋅ICCF[IonChamberCalUnits/nC]

AbsoluteDoseDisplay[DisplayUnits]=⋅ DUCF[DisplayUnits/IonChamberCalUnits]⋅ ADCF⋅ FPGF

3.5.4 Absolute Dose Rate

I [nC/Min] ⋅ ICCF [ Ion Chamber Cal Units/nC]

Absolute Rate Display [Display Units/Min] = ⋅ DUCF [Display Units/ Ion Chamber Cal Units] ⋅ ADCF ⋅ FPGF

3.5.5 Percent-of-Center

Percentage Display for Perhiperal Channel [%] = 100 [%] ⋅ Absolute Rate Display for Perhiperal Channel Absolute Rate Display for Center Channel

3-6

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Contents Model Tracker SystemFluke Biomedical Table of Contents Theory of Operation Maintenance and ServiceAppendix a Using Build-Up CustomizationGeneral Information IntroductionFeatures ModelSpecifications Before You Start Safety PrecautionsSafety Terms Manual AddendaRecommended Operation Conditions Nominal Ion Chamber CharacteristicsMechanical Specifications Ion Chamber Factory CalibrationModel 35360A Tracker Display Measurements ModeDisplay Mode Electrometer / A-D ConverterInterface Cable Detector to Display High Performance Battery ChargerUnpacking and Inspection EnvironmentStandard System Contents Optional EquipmentBlank Operation Rear Panel FamiliarizationPowering the System Detector InputDisplay. Be sure to use the correct end of the cable Positioning the Model 35300A Detector in the Beam 3 RS-232 Computer Interface RJ-45 StyleOperation Positioning the Model 353300A Detector in the Beam Operation Instructions Front Panel ControlsTest/Detector PowerReset Units SelectPowering Down the Model 35360A Tracker Display Powering Up the Model 35360A Tracker DisplayUsing the TEST/DETECTOR Button Using the Units Select Button Test/Detector Screen 2 Ion Chamber Calibration FactorsUsing the AIR Density Button Using the Gain Select Button Normal ModeUsing the Measure Select Button Normal Mode Absolute MeasurementsPercent-of-Center Measurements Battery and Bias Annunciators Underranging and Overranging ConditionsGain Setting Mode 24. Positions of the Battery and Bias AnnunciatorsSaving the Fpgf Changes Aborting the Fpgf ChangesBlank Theory of Operation Power Supply Hardware Block Diagram of the Model 35360A Tracker DisplayProcessor Front Panel Switches2 300-VOLT Electronic Bias Supply VFD DisplayElectrometer Serial Communications PortMultiplexer and A/D Converter Model 35300A Ion Chamber Detectors Air Density CorrectionsBasic Operating Equations Basic Operating Quantities Blank Maintenance & Service Troubleshooting ProblemNo Display Flowchart Low Battery Indication at the Display Low battery Yes Annuciator displayed?Bias Error LoBias or HiBias Indication at the Display 35360A TrackerLeakage Flowchart Line Fuse Replacement Dose Rate Measurement Zero Problem FlowchartIf fuses continue to blow return instrument for repair Cleaning the Instrument Interface Connector CleaningReplaceable Parts Information Replaceable Parts List Recalibration & Repair Information / Technical AssistanceCustomization Starting the Customization Software Make a Working DiskConnection to the Computer Screen FormatsDisplay Customization Items Screen Appearance F6 Print Report Printing F1 Help On-Line Help for using the Customization softwareF2 Edit Item Editing F10 ExitDefinitions Current Gain, Current Zero IG and ADZ Setting the Electrometer Gains and OffsetsCharge Gain QG Ion Chamber Calibration Factor IccfElectrometer Current Gain IG Electrometer Charge Gains QGChanging the Power Down Interval Usage ExamplesChanging the ION Chamber Calibration Factor Units Errors Input ErrorsUsing Build-Up Build-Up, Peg, and Retainer Kit OptionsNominal Number of build-up Solid Water Appendix Fluke Biomedical