Fluke 35040 - page 76

35040

Operators Manual

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Contents

Main Page Table of Contents Page Appendix B: Addendum Features of Firmware Version 27JAN00 or Later............. B-1 Page Section 1 General Information 1.1 Introduction 1.2 Features 1.3 Before You Start - Safety Precautions 1.4 Safety Symbols And Terms 1.5 Manual Addenda 1.6 Specifications Charge Measurements Timed Charge Measurements Current Measurements Average Current Measurements Effective Exposure Time Measurements General Measurements High Performance Power Supply and Battery Charger Internal Electronic High Voltage Ion Chamber Bias Supply General Environment Mechanical 1.7 Unpacking and Inspection Standard System Contents Page Section 2 Theory of Operation 2.1 Introduction 2.2 Functional Description 2.2.1 Power Supply 2.2.2 Front Panel 2.2.3 MicroController 2.2.4 Serial Communications Port 2.2.5 Electrometer 2.3 Basic Operating Equations Page Charge and Current Measurements () ( ) () ( ) Leakage Measurements = I () ( Timed Charge and Dose ()() )() Predicted Timed Charge and Dose 2.3.1 Setting Thresholds Thresholds other than those used by the calibration agency may render inaccurate measurements. 2.3.2 Exposure Time 2.3.3 Air Density Correction Factor Page Section 3 Operation 3.1 Setup Introduction 3.2 Front Panel Familiarization Figure 3-1. The Model 35040 Therapy Dosimeter Front Panel 3.3 Rear Panel Familiarization 3.4 Powering The System 3.5 Power-Up Self-Test and Display Messages Leakage: 0.001 pA 3.6 Ion Chamber Connector ADC IC Bias: 300.0V CEP Batt: 6.8 V +0.10 A 3.7 Basic Measurement Techniques 3.7.1 General Considerations 3.7.2 Making Non-Timed Exposure Measurements 3.7.3 Making Timed Exposure Measurements Timer Setup Timer Use The instrument will not permit the timer to be started while leakage is being measured. 3.8 Battery Care 3.9 Operation Instructions 3.9.1 Front Panel Controls 3.9.2 Powering Up the Model 35040 Therapy Dosimeter *Optional Text Line2 3.9.3 Powering Down the Model 35040 Therapy Dosimeter *Optional Text Line1 3.9.4 Using the TEST FUNCTION Button ADC FW Rev: 10JUN93 A Leakage: 0.001 pA ADC IC Bias: 300.0 V CEP Batt: 6.8 V +0.10 A QScaleFactor=1.0000 IScaleFactor=1.0000 Start Thres: 1.0pA Stop Thres: 0.9pA Current: 0.0pA Start Thres: 1.0 pA Stop Thres: 0.9 pA Current: 0.0 pA ADC ALC Interval: 60 s Count: UP Decimal Places: 0 ADC ALC Exp Time: HR/MIN/SEC Calibrated by Keithley RMD Nov 15, 1993 3.9.6 Timer Setup 3.9.7 Setting Thresholds Interval: 60 s Count: UP Decimal Places: 0 ADC ALC 3.9.8 Using the DETECTOR SELECT Button The ion chambers calibration unit includes the radiological measurement unit. 3.9.9 Using the AIR DENSITY Button Farmer - S/N 12345 Co-60 ICCF=4.678E+09 R/C 22.5 C 760 mmHg ADCF = 1.002 3.9.10 Using the UNITS SELECT Button dose unit: R 3.9.11 Using the BIAS SELECT Button 22.5 C 760 mmHg ADCF = 1.000 OFF rate unit: R/min Set: 300.0 V 100% Central Electrde Pos IC Bias: 300.0 V CEP WARNING Set: 0.0 V 0% Bias Off IC Bias: 0.0 V OFF Set: -150.0 V -50% Central Electrde Neg IC Bias:-150.0 V CEN 3.9.12 Using the RESET/MEASURE Button 39.995 nC 59.891 s 659.8 pA OVER pA OVER nC OVER s Figure 3-29. The Measurement Overrange Screen OVER nC OVER min OVER s OVER pA Current Overrange Reduce exposure and Internal Reset Error and Repeat Exposure Press RESET/MEASURE 3.9.16 Annunciators ADC ALC Internal Reset Error 39.995 nC 59.891 s ADC LoBias Tmr ALC 659.8 pA 3.10 Customization 3.10.1 Introduction 3.10.2 Installing/Uninstalling Customization Software 3.10.3 Connection to the Computer 3.10.4 Starting the Customization Software 3.10.5 Downloading 3.10.6 Menu Items and Controls Ion Chambers, Bias Settings, Special Items, Measurement Displays, or Timer Intervals COM PORT Drop Down List 3.10.7 Ion Chambers EDIT 3.10.8 Special Items DOWNLOAD and CANCEL 3.10.9 Measurement Displays Page Page Page 3.10.11 Bias Settings 3.10.12 Examples Changing the Pressure Units Customizing a Measurement Display Appending a Display Deleting a Display Inserting a Display 3.10.13 Errors Printing Error Com Initialization Error Serial Link Error Download Errors Troubleshooting and Service 4.1 Introduction 4.2 Troubleshooting Page and Repeat Exposure Press RESET/MEASURE Service Required Error Number : 16 Internal Reset Error Reduce exposure and Reduce exposure and Press RESET/MEASURE Current Overrange ADC Current Overrange Page 4.3 Display Will Not Light 4.4 Low Battery 4.5 Bias Error 4.6 Line Fuse Replacement 4.7 Interface Connector Cleaning 4.8 Cleaning The Instrument 4.9 Replaceable Parts Information 4.10 Recalibration, Repair Information & Technical Assistance 4.11 Warranty Information Page Appendix A Sample Customization Reports Page Page Page Page Page Appendix B Features of Firmware Version27JAN00 or Later B.1 Introduction B.2 New Features B.2.1 Overview B.2.3 Specifications Update Charge Measurements Timed Charge Measurements Current Measurements Average Current Measurements B.3 SETUP B.3.1 Making Non-Timed Exposure Measurements With Automatic Leakage Compensation Disabled Procedure With Automatic Leakage Compensation Enabled B.3.2 Making Timed Exposure Measurements B.4 Operation Instructions B.4.1 Front Panel Controls Page Start Thres: 1.0 pA Stop Thres: 0.9 pA Current: 0.0 pA ADC ALC Start Thres: NA pA Stop Thres: NA pA Current: 0.0 pA ADC OFF B.4.4 Timer Setup Interval: 60 s Count: UP Decimal Places: 0 ADC ALC Press RESET/MEASURE and Repeat Exposure ADC ALC Internal Reset Error 39.995 nC 59.891 s ADC LoBias Tmr ALC 659.8 pA Page B.5 Theory Of Operation Basic Operating Equations Leakage Measurements Timed Charge and Dose ()() B.6 Troubleshooting Service Required Error Number : 16 ADC Configuration Error B.7 Customization Reduce exposure and Press RESET/MEASURE B.7.1 The Main Menu B.7.2 The Measurement Menu Page Timer Intervals