Bias Error, Go to, Line | Fluke 35040 instruction

35040

Operators Manual

4.5 Bias Error

				Go to
				line:
	1.	Is "??Bias" displayed?	YES	2
	1.	Is "??Bias" displayed?	NO	6
			NO	6
	2.	Has the instrument been on for more than one minute?	YES	3
	2.	Has the instrument been on for more than one minute?	NO	8
			NO	8
	3.	Turn off the power. Wait 10 seconds. Turn on the power. Wait 1 minute. Is	YES	4
	3.	"??Bias" displayed?	NO	--
		"??Bias" displayed?	NO	--
	4.	PROBLEM: Electrometer fault. See Section 4.10.	YES	5
	4.	PROBLEM: Electrometer fault. See Section 4.10.	NO	--
			NO	--
	5.	Change the bias voltage to a different setting and then change back. Wait
	5.	about 10 seconds. Is the error on the display?
		about 10 seconds. Is the error on the display?
		Change the bias voltage to 0.0 V. Disconnect all triax cables. Cap the	YES	7
	6.	connectors. Change bias voltage to desired setting. Wait about 10 seconds.	YES	7
	6.		NO	8
		Is the error on the display?	NO	8
		Is the error on the display?
	7.	Change the bias voltage to 0.0 V. Examine the triax connectors on the
	7.	instrument, both front and rear, for foreign matter. Is foreign matter present?

	8.	See Section 4.7.	YES	9
	8.	See Section 4.7.	NO	18
			NO	18
	9.	Normal operation established.	YES	10
	9.	Normal operation established.	NO	11
			NO	11
	10.	Do you use a separate cable to connect the ion chamber to the instrument?

		Change the bias voltage to 0.0 V. Connect only the cable to the instrument.	YES	12
	11.	Change the bias voltage to the desired setting. Wait about 10 seconds. Is the	YES	12
	11.		NO	13
		error on the display?	NO	13
		error on the display?
	12.	PROBLEM: Bias fault in cable. See Section 4.10.

		Change the bias voltage to 0.0 V. Connect the ion chamber. Change the bias	YES	14
	13.	voltage to the desired setting. Wait about 10 seconds. Is the error on the	YES	14
	13.		NO	16
		display?	NO	16
		display?
	14.	PROBLEM: Bias fault in instrument. See Section 4.10.	YES	15
	14.	PROBLEM: Bias fault in instrument. See Section 4.10.	NO	17
			NO	17
	15.	PROBLEM: Bias fault in ion chamber. See Section 4.10.

	16.	This message is displayed until the signals from the isolated side are valid.

4-8

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Fluke 35040 manual Bias Error, Go to, Line

Contents

35040 Therapy Dosimeter Fluke 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 Addenda Timed Charge Measurements Full Scale Range Display Resolution Noise ± countsFull Scale Range Display Resolution Current Measurements Specifications 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 Description MicroController Power SupplyFront Panel Serial Communications Port Bias Supply Basic Operating EquationsElectrometer Multiplexer and A/D Converter QAccum Quantity Description Units CommentsQExposure QAccumprevious Charge and Current Measurements Leakage Measurements= time of electrometer conversion s Exposure Charge and Dose Timed Charge and Dose Accumulated Charge and Dose Setting ThresholdsPredicted Timed Charge and Dose Exposure Current and Rate Exposure Time DoseRate = I a × Iccf Units/C × Adcf × RateMultiplier s Air Density Correction Factor ⎝ PMm Hg = inch Hg x Standard Resolution Error Units Display Minimum Maximum Front Panel Familiarization SetupSetup Introduction Powering The System Rear Panel Familiarization Power-Up Self-Test and Display Messages Ion Chamber Connector Basic Measurement Techniques General ConsiderationsMaking Non-Timed Exposure Measurements Timer Setup Timer Use3Making Timed Exposure Measurements Battery Care Using Other Ion Chambers Operation Instructions PowerBattery Care Front Panel Controls Powering 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 Compensation Calibrated by Keithley RMD Nov 15 6Timer Setup 17. The Test Function Screen Showing the Timer Settings Using the Detector Select Button Using the AIR Density Button Using the Units Select Button Using the Bias Select Button Set 300.0 V 100% Central Electrde Pos IC Bias 300.0 V CEP Using the RESET/MEASURE Button Overranging Conditions Reset 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 Measurement Connection to the Computer Installing/Uninstalling Customization SoftwareCustomization Starting the Customization Software Downloading Menu Items and ControlsCOM Port Drop Down List Ion Chambers Close or File CloseFile Save AS and File Print Edit OK and Cancel Special Items Download and Cancel 36. The Special Items Menu Calibration Temperature has focus Measurement Displays Operators Manual Available Display Lines Display Line Selecting an Item and Placing It Using the APPEND, DELETE, and Insert ButtonsDisplay Line Group Selection Changing a Line on a Display Timer Intervals 38. The Timer Intervals Form Bias Settings 39. The Bias Settings Form Examples Appending a Display Changing the Pressure UnitsCustomizing a Measurement Display Deleting a Display Errors Troubleshooting and Service Troubleshooting Symptom HiBias annunciator displayed Symptom Display does not light up when Power is pressedSymptom ??Bias annunciator displayed Symptom LoBias annunciator displayed Bit Description Action Symptom Internal Reset Error displayedSymptom Configuration Error displayed Do not make Symptom Bias voltage measurement changes by one digit Symptom Current Overrange DisplayedSymptom Dashes displayed instead of digits Measurements. Return Example 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 Replacement Interface Connector Cleaning Cleaning The InstrumentReplaceable Parts Information Recalibration, Repair Information & Technical Assistance Warranty InformationReplaceable Parts List Replaceable Parts Information Blank Sample Customization Reports Sample Documents 35040 Appendix Sample Customization Reports 35040 Appendix Sample Customization Reports Blank Introduction New Features OverviewTimed Measurements Specifications Update Setup New Features B Timer Setup Procedure Timer Use ProcedureMaking Timed Exposure Measurements RESET/MEASURE Setup B ADC ALC Automatic Leakage Compensation Start NA pA Stop Thres Current Operation Instructions B Timer Setup Decimal Places Annunciators, Indicators, and Overrange Conditions Table B-2. Measurement Indicators and ConditionsTable B-1. Annunciators Table B-3. Overrange Conditions Condition Overranged Measurement1 Theory Of Operation Theory of Operation Configuration 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