Fluke 90100 manual Percent-of-Center Measurements

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Model 90100

Operators Manual

Figure 2-18. An Absolute Rate Measurement With Air Density Corrections and the Front Panel Gain Factors Disabled

Prior to making a dose measurement, press the RESET button to zero all ion chamber readings. Pressing this button has no affect when performing dose rate measurements.

2.4.8.2 Percent-of-Center Measurements

The Percent-of-Center Measurement screen displays the central ion chamber's reading in absolute measurement units and the four peripheral ion chamber's readings as a percentage of the center ion chamber's reading.

top

centerx 100%

left	x 100%	right x 100%

center		center

bottomcenterx 100%

center units

Figure 2-19. A Percentage Measurement Showing How the Ratios are Calculated

Figure 2-20. A Percentage Dose Measurement With Air Density Corrections and the Front Panel Gain Factors Enabled

Figure 2-21. A percentage rate measurement with both air density corrections and the front panel gain factor disabled

NOTE

Pressing the RESET button while performing a dose measurement causes all percentages to immediately change to "UNDER". This is normal operation (see section 2.4.8.3 for more information).

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Contents Model Tracker SystemFluke Biomedical Table of Contents Maintenance and Service Appendix a Using Build-UpTheory of Operation CustomizationGeneral Information IntroductionFeatures ModelBefore You Start Safety Precautions Safety TermsSpecifications Manual AddendaNominal Ion Chamber Characteristics Mechanical SpecificationsRecommended Operation Conditions Ion Chamber Factory CalibrationMeasurements Mode Display ModeModel 35360A Tracker Display Electrometer / A-D ConverterHigh Performance Battery Charger Unpacking and InspectionInterface Cable Detector to Display 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 ControlsPower ResetTest/Detector Units SelectPowering Up the Model 35360A Tracker Display Powering Down 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 DisplayFront Panel Switches 2 300-VOLT Electronic Bias SupplyProcessor VFD DisplaySerial Communications Port ElectrometerMultiplexer 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 Interface Connector Cleaning Cleaning the InstrumentReplaceable Parts Information Replaceable Parts List Recalibration & Repair Information / Technical AssistanceCustomization Make a Working Disk Connection to the ComputerStarting the Customization Software Screen FormatsDisplay Customization Items Screen Appearance F1 Help On-Line Help for using the Customization software F2 Edit Item EditingF6 Print Report Printing F10 ExitDefinitions Setting the Electrometer Gains and Offsets Charge Gain QGCurrent Gain, Current Zero IG and ADZ 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