Fluke 90100 manual Using the Measure Select Button Normal Mode, Absolute Measurements

Page 23

Operation

Operation Instructions 2

NOTE

The FPGF for the center ion chamber is displayed on the bottom line of the VFD.

Use the UP and DOWN buttons to toggle the FPG annunciator on or off. The FPG annunciator in the upper right-hand corner of the display signifies that FPG corrections are enabled, see Figure 2-15. When the FPG annunciator appears, the 35360A TRACKER Display multiplies each ion chamber's exposure value by its FPGF before displaying the reading. See section 2.4.10 for information on how to set the front panel gain factors.

2.4.8 Using the MEASURE SELECT Button (Normal Mode)

Press the MEASURE SELECT to display the Measurement screen. The 35360A TRACKER Display can present the measurement data in an absolute form, or as a percentage of the center ion chamber. While the Measurement screen is displayed, press the MEASURE SELECT button to toggle the display mode between the percentage-of-center and absolute presentations.

2.4.8.1 Absolute Measurements

Figure 2-15 shows the ion chamber layout for the Measurement screen in the absolute display mode. The 35360A TRACKER Display displays the four outside ion chamber readings in a diamond pattern above the center channel. All five readings are in the selected units ("rads" in this case).

 

top

 

left

right

 

 

bottom

 

 

center units

 

Figure 2-16.

Measurement Screen Showing the Ion Chamber Layout

 

 

 

 

 

 

 

NOTE

 

 

The measurement value corresponding to the

 

central ion chamber is always displayed on the

 

bottom line of the VFD.

Figure 2-17. An Absolute Dose Measurement With Air Density Corrections and the Front Panel Gain Factors Enabled

2-11

Page 22 Page 24
Image 23
Page 22 Page 24
Contents Tracker System ModelFluke Biomedical Table of Contents Customization Maintenance and ServiceAppendix a Using Build-Up Theory of OperationIntroduction General InformationModel FeaturesManual Addenda Before You Start Safety PrecautionsSafety Terms SpecificationsIon Chamber Factory Calibration Nominal Ion Chamber CharacteristicsMechanical Specifications Recommended Operation ConditionsElectrometer / A-D Converter Measurements ModeDisplay Mode Model 35360A Tracker DisplayEnvironment High Performance Battery ChargerUnpacking and Inspection Interface Cable Detector to DisplayOptional Equipment Standard System ContentsBlank Rear Panel Familiarization OperationDetector Input Powering the SystemDisplay. Be sure to use the correct end of the cable 3 RS-232 Computer Interface RJ-45 Style Positioning the Model 35300A Detector in the BeamOperation Positioning the Model 353300A Detector in the Beam Front Panel Controls Operation InstructionsUnits Select PowerReset Test/DetectorUsing the TEST/DETECTOR Button Powering Up the Model 35360A Tracker DisplayPowering Down the Model 35360A Tracker Display Test/Detector Screen 2 Ion Chamber Calibration Factors Using the Units Select ButtonUsing the Gain Select Button Normal Mode Using the AIR Density ButtonAbsolute Measurements Using the Measure Select Button Normal ModePercent-of-Center Measurements Underranging and Overranging Conditions Battery and Bias Annunciators24. Positions of the Battery and Bias Annunciators Gain Setting ModeAborting the Fpgf Changes Saving the Fpgf ChangesBlank Theory of Operation Hardware Block Diagram of the Model 35360A Tracker Display Power SupplyVFD Display Front Panel Switches2 300-VOLT Electronic Bias Supply ProcessorMultiplexer and A/D Converter Serial Communications PortElectrometer Air Density Corrections Model 35300A Ion Chamber DetectorsBasic Operating Equations Basic Operating Quantities Blank Maintenance & Service Problem TroubleshootingNo Display Flowchart Low battery Yes Annuciator displayed? Low Battery Indication at the Display35360A Tracker Bias Error LoBias or HiBias Indication at the DisplayLeakage Flowchart Dose Rate Measurement Zero Problem Flowchart Line Fuse ReplacementIf fuses continue to blow return instrument for repair Replaceable Parts Information Interface Connector CleaningCleaning the Instrument Recalibration & Repair Information / Technical Assistance Replaceable Parts ListCustomization Screen Formats Make a Working DiskConnection to the Computer Starting the Customization SoftwareDisplay Customization Items Screen Appearance F10 Exit F1 Help On-Line Help for using the Customization softwareF2 Edit Item Editing F6 Print Report PrintingDefinitions Ion Chamber Calibration Factor Iccf Setting the Electrometer Gains and OffsetsCharge Gain QG Current Gain, Current Zero IG and ADZElectrometer Charge Gains QG Electrometer Current Gain IGUsage Examples Changing the Power Down IntervalChanging the ION Chamber Calibration Factor Units Input Errors ErrorsBuild-Up, Peg, and Retainer Kit Options Using Build-UpNominal Number of build-up Solid Water Appendix Fluke Biomedical
Top Page Image Contents