Basic Operating Equations | Fluke 90100 guide

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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Fluke 90100 manual Basic Operating Equations

Contents

Model Tracker System Fluke Biomedical Table of Contents Theory of Operation Maintenance and ServiceAppendix a Using Build-Up Customization General Information Introduction Features Model Specifications Before You Start Safety PrecautionsSafety Terms Manual Addenda Recommended Operation Conditions Nominal Ion Chamber CharacteristicsMechanical Specifications Ion Chamber Factory Calibration Model 35360A Tracker Display Measurements ModeDisplay Mode Electrometer / A-D Converter Interface Cable Detector to Display High Performance Battery ChargerUnpacking and Inspection Environment Standard System Contents Optional Equipment Blank Operation Rear Panel Familiarization Powering the System Detector Input Display. 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 Style Operation Positioning the Model 353300A Detector in the Beam Operation Instructions Front Panel Controls Test/Detector PowerReset Units Select Powering 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 Factors Using the AIR Density Button Using the Gain Select Button Normal Mode Using the Measure Select Button Normal Mode Absolute Measurements Percent-of-Center Measurements Battery and Bias Annunciators Underranging and Overranging Conditions Gain Setting Mode 24. Positions of the Battery and Bias Annunciators Saving the Fpgf Changes Aborting the Fpgf Changes Blank Theory of Operation Power Supply Hardware Block Diagram of the Model 35360A Tracker Display Processor Front Panel Switches2 300-VOLT Electronic Bias Supply VFD Display Electrometer Serial Communications PortMultiplexer and A/D Converter Model 35300A Ion Chamber Detectors Air Density Corrections Basic Operating Equations Basic Operating Quantities Blank Maintenance & Service Troubleshooting Problem No Display Flowchart Low Battery Indication at the Display Low battery Yes Annuciator displayed? Bias Error LoBias or HiBias Indication at the Display 35360A Tracker Leakage Flowchart Line Fuse Replacement Dose Rate Measurement Zero Problem Flowchart If fuses continue to blow return instrument for repair Cleaning the Instrument Interface Connector CleaningReplaceable Parts Information Replaceable Parts List Recalibration & Repair Information / Technical Assistance Customization Starting the Customization Software Make a Working DiskConnection to the Computer Screen Formats Display Customization Items Screen Appearance F6 Print Report Printing F1 Help On-Line Help for using the Customization softwareF2 Edit Item Editing F10 Exit Definitions Current Gain, Current Zero IG and ADZ Setting the Electrometer Gains and OffsetsCharge Gain QG Ion Chamber Calibration Factor Iccf Electrometer Current Gain IG Electrometer Charge Gains QG Changing the Power Down Interval Usage Examples Changing the ION Chamber Calibration Factor Units Errors Input Errors Using Build-Up Build-Up, Peg, and Retainer Kit Options Nominal Number of build-up Solid Water Appendix Fluke Biomedical