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Troubleshooting and Service

Troubleshooting

4

 

 

 

 

4-5

 

 

 

Example:  299.9 to 300.0

 

Cause: 

Rounding error in measurement. 

Action: None. 

Explanation:   The bias voltage is not actually changing.  The control for the bias is in discrete steps.  

The measurement is also in discrete steps.  The control program may select a setting 
that causes the measurement to be very near the transition between one measurement 
step and the next. 

Summary of Contents for 35040 Operators

Page 1: ...40 Therapy Dosimeter Operators Manual February 2005 Manual No 37870 Rev 10 2004 2005 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective compani...

Page 2: ...Fluke Biomedical Radiation Management Services 6045 Cochran Road Cleveland Ohio 44139 440 498 2564 120 Andrews Road Hicksville New York 11801 516 870 0100 www flukebiomedical com rms...

Page 3: ...Front Panel Familiarization 3 1 3 3 Rear Panel Familiarization 3 2 3 4 Powering the System 3 2 3 5 Power Up Self Test and Display Messages 3 3 3 6 Ion Chamber Connector 3 3 3 7 Basic Measurement Techn...

Page 4: ...ntroduction 4 1 4 2 Troubleshooting 4 1 4 3 Display Will Not Light 4 6 4 4 Low Battery 4 7 4 5 Bias Error 4 8 4 6 Line Fuse Replacement 4 9 4 7 Interface Connector Cleaning 4 10 4 8 Cleaning the Instr...

Page 5: ...ter B 1 B 4 5 Reset Error with Automatic Leakage Compensation Enabled B 8 B 4 6 Annuciators Indicators and Overrange Conditions B 9 B 5 Theory of Operation B 11 B 6 Troubleshooting B 12 B 7 Customizat...

Page 6: ...Blank page...

Page 7: ...ur timed measurement quantities which may be added to any of the measurement displays with the Customization software Triaxial ion chamber input connectors are furnished on both the front and rear of...

Page 8: ...riod when operating from battery power 1 3 Before You Start Safety Precautions The Model 35040 Therapy Dosimeter should be used only by people who are Aware of and understand the limitations of the de...

Page 9: ...integrated using a capacitive feedback electrometer whose output is measured by means of a 20 bit bipolar A D converter A high speed reset circuit removes the integrated charge on the feedback capacit...

Page 10: ...A 2 2 000 nA 0 001 nA 2 20 00 nA 0 01 nA 1 200 0 nA 0 1 nA 1 1 000 A 0 001 A 1 Measurement Method The basic current measurement is derived by monitoring the change in the integrated charge level over...

Page 11: ...d as the quotient of the charge and average current measurement values A minimum exposure duration of 3 5 seconds is required to produce an effective exposure time measurement value Measurement Accura...

Page 12: ...the 10 s period immediately prior to the start of the exposure Current Leakage Dosimeter input leakage is warranted to be less than 10 fA over both the full operating temperature range of 8 C to 38 C...

Page 13: ...45 style jack mounted on rear panel Interface operates at 9600 bps with 8 bits no parity and one stop bit Xon Xoff handshaking is employed Display 4 line by 20 character vacuum florescent type Environ...

Page 14: ...35040 Operators Manual 1 8 CD 35040 Standard Customization 37870CD 9 pin connector adaptor 37616 7 foot RJ 45 Cable 105 260...

Page 15: ...and current Calibrated ion chamber factors convert charge and current to directly measure radiation dose and dose rate in the user specified radiological units The reading may be corrected for air de...

Page 16: ...attery annunciator LoBat is displayed on the front panel Less than 30 minutes of operating time are left When the voltage drops to 5 4 volts the firmware automatically turns off the instrument The har...

Page 17: ...designed to drive a capacitive load of less than 5000 pf Attaching a larger capacitance may create a potential shock hazard For operator safety the output of the bias supply is energy and current limi...

Page 18: ...red when no incident radiation is present I Current A Calibrated electrical current IAvg Average Current A The constant electrical current required to accumulate charge Q over time TStart to T ICCF Io...

Page 19: ...ge measurements QOffset ILeakage and TOffset are only applicable when automatic leakage compensation is enabled The leakage current is defined as the current present between exposures The displayed le...

Page 20: ...The exposure charge variable QExposure is set to zero at the start of an exposure either manually by pressing the RESET MEASURE button or automatically if the start and stop thresholds are used Over t...

Page 21: ...um Q Q Q ADCF ICCF Q DoseAccum Accum Units C C Exposure Current and Rate The current 3 1 2 digit and dose rate displayed when the exposure is in progress are updated once per second The current and do...

Page 22: ...time RESET MEASURE was pressed and charge will accumulate due to leakage current Thresholds other than those used by the calibration agency may render inaccurate measurements 2 3 2 Exposure Time Histo...

Page 23: ...the bottom line of the Air Density screen When the user has customized the Model 35040 Therapy Dosimeter to use other temperature and pressure units the corresponding values entered by the user at th...

Page 24: ...ft 1200 10 000 0 25 0 07 altitude in meters m 360 3050 0 10 0 09 millibars mbar 697 1060 1013 1 0 0 07 hectoPascals hPa 697 1060 1013 1 0 0 07 Units Display Minimum Maximum Standard Resolution Error...

Page 25: ...selecting the desired ion chamber calibration factor temperature units pressure units and bias voltages Procedures for carrying out the customization are covered in Section 3 10 3 2 Front Panel Famili...

Page 26: ...NOT attach ion chambers to both the front and rear connectors at the same time The signals will be the summation of the two inputs and may result in erroneous readings 3 4 Powering The System The Mod...

Page 27: ...els on the screen 2 10 seconds 2 Calibration information showing the calibration agency and the calibration date 2 seconds 3 Firmware revision date 2 seconds 4 Instrument bias leakage and battery leve...

Page 28: ...imeter must be placed on a solid non vibrating surface Both the dosimeter and the operator must be outside the radiation field Any cable movement will induce a current that may interfere with proper m...

Page 29: ...TEST FUNCTION button to display the f cursor at the timer interval field and use the UP and DOWN arrows to select a timer interval from the programmed list Refer to Section 3 10 for information on ho...

Page 30: ...at their full charge level and insure that the instrument is ready to go anytime it is needed 2 If the instrument cannot be connected to AC line power during storage fully recharge the batteries at t...

Page 31: ...40 Therapy Dosimeter The front panel consists of a triax connector control buttons and a display The following paragraphs describe the operation of each control button and the corresponding display sc...

Page 32: ...ggles the timer Pressing and holding the RESET MEASURE button for one second zeroes all exposure measurements the instrument also zeroes leakage measurements if leakage was being measured Up S The fun...

Page 33: ...pecified warm up time must elapse before specified accuracy is warranted 3 9 3 Powering Down the Model 35040 Therapy Dosimeter Pressing the POWER button turns the instrument off As part of the power d...

Page 34: ...ches its full charge the charging circuit switches to float charge stage with a corresponding voltage of approximately 7 volts The unit will remain in the float charge stage as long as the instrument...

Page 35: ...the cursor and save the selection 3 9 5Automatic Leakage Compensation Automatic compensation for leakage currents can be enabled and disabled from the front panel Automatic leakage compensation allows...

Page 36: ...off OFF Figure 3 15 the start and stop threshold settings cannot be changed and display Not Available NA as do the leakage measurements Figure 3 14 Automatic Leakage Compensation Enabled Figure 3 15...

Page 37: ...and one 1 Zero decimal places displays time in whole seconds while one decimal place displays time to a tenths of a second Presently the timer counts only in whole seconds 3 9 7 Setting Thresholds Th...

Page 38: ...ter a new ICCF with the appropriate units The descriptive text should contain enough information to let the operator correctly select an ICCF that is appropriate for the measurement desired e g energy...

Page 39: ...ted for Dose Measurements Ion chambers having dose rate calibration units will not have a rate divisor e g Curies Ci becquerles Bq or kerma Sk The dose rate units will be multiplied by seconds to prod...

Page 40: ...top line of the display will read WAIT Bias Not Ready until the measured voltage matches the selection If the RESET MEASURE button is pressed while the bias voltage is changing the bias may be set to...

Page 41: ...hold automatically zeros all measurement readings Figure 3 26 The Measurement Screen Press RESET MEASURE from the Measurement screen to restart the leakage measurement process after moving the triax c...

Page 42: ...d dose current 100 0 nA all except leakage time 59 min 59 s effective exposure time 3 9 14 Reset Error Pressing the RESET MEASURE button while on the Measurement Screen causes the Model 35040 Therapy...

Page 43: ...is dedicated to status annunciators The Model 35040 Therapy Dosimeter continuously monitors the ion chamber bias and battery voltages If either one of these values is outside the specified range the...

Page 44: ...rge is injected at the beginning of the exposure NA Leakage The leakage measurement is not available since automatic leakage compensation is disabled OVER Non leakage1 The quantity or one of its depen...

Page 45: ...he Control Panel On the Install Uninstall tab select 35040 Customization in the list of programs and click the Add Remove button You will have to manually delete any Dosimeter Settings text files TXT...

Page 46: ...to what it sent down in order to verify that the screen display and instrument contents are the same In some cases the downloading process may last several seconds 3 10 6 Menu Items and Controls Refe...

Page 47: ...ion All the Bias Settings CLOSE or FILE CLOSE Select CLOSE to terminate the Customization program The program verifies the choice of Close before terminating the program Select Yes to exit select No t...

Page 48: ...two buttons OK and CANCEL Refer to Figure 3 35 The following description of the Parameter Editor may be followed when editing appending or inserting ion chamber parameters Figure 3 35 The Program Ion...

Page 49: ...apy Dosimeter select CANCEL to discard the ion chamber and stop the append operation DELETE If you want to delete an ion chamber select it from the List Box When you click on DELETE you are asked to c...

Page 50: ...rop down list by clicking on it When a Special Item has been edited or changed its text box background color will change from white to yellow Permanent storage in the Dosimeter s memory is made only a...

Page 51: ...gure 3 37 shows the Measurement Displays Form Figure 3 37 The Measurement Displays Form right click the mouse on an item in the Display Line List to show the format of the Display Line The display lin...

Page 52: ...Optional Text 2 Optional Text Line 2 Battery Voltage Batt V A Leakage Current Leakage pA Bias Voltage IC Bias V CEP Charge nC Current pA Accumulated Charge nC ACCUM Average Current pA AVG Timed Charg...

Page 53: ...a Display in the instrument During these operations different Displays will appear A maximum of four 4 displays can be viewed at any time To see other Displays use the vertical scroll bar in the Disp...

Page 54: ...als Form that contains the timer interval settings general editing information and DOWNLOAD and CANCEL buttons Figure 3 38 The Timer Intervals Form Select a field by clicking on it with the mouse Ente...

Page 55: ...ntains 11 bias setting fields general editing information and DOWNLOAD and CANCEL buttons Figure 3 39 The Bias Settings Form Select a field by clicking on it with the mouse Enter a bias voltage settin...

Page 56: ...e program enters the Edit mode where you may change the parameters as described in the first example Select OK to complete the APPEND operation select CANCEL to abort it INSERT 1 Click on an ion chamb...

Page 57: ...display text into the third line of Display 2 and downloads the new contents of Display 2 to the Model 35040 Therapy Dosimeter To preview the display text place the mouse icon over a display line des...

Page 58: ...if the Customization software cannot initialize the printer Check the computer connection to the printer and try printing again Com Initialization Error The selected serial COM port could not be initi...

Page 59: ...s steps that the operator may take to identify and correct problems It also gives instructions on how to order replacement parts or arrange for service if necessary For the purpose of troubleshooting...

Page 60: ...ing Since there is no question you are done Symptom Display does not light up when POWER is pressed Cause The battery voltage may be very low Action See Section 4 3 Explanation The instrument will not...

Page 61: ...splayed Cause The instrument has lost the calibration or customization data Action Convert the configuration error number to a binary value using a program such as the Windows Calculator and use the t...

Page 62: ...uce the current Explanation The instrument has a 1 000 uA limit on measurable current and will continue to measure charge for currents up to 1 200 uA The instrument can accept an input current up to 3...

Page 63: ...rement Action None Explanation The bias voltage is not actually changing The control for the bias is in discrete steps The measurement is also in discrete steps The control program may select a settin...

Page 64: ...on battery the instrument will turn itself off This is to protect the battery from becoming severely discharged 7 Replace cord with known good cord or establish that the line cord is good Is line cord...

Page 65: ...tery current between 0 10 A and 3 00 A YES NO 7 8 7 The battery is charging LoBat indicator will turn off when the battery voltage is above 5 9 volts 8 Is the battery current between 1 00 A and 0 10 A...

Page 66: ...ax connectors on the instrument both front and rear for foreign matter Is foreign matter present 8 See Section 4 7 YES NO 9 18 9 Normal operation established YES NO 10 11 10 Do you use a separate cabl...

Page 67: ...ure 4 1 Model 35040 Therapy Dosimeter Fuse Replacement 2 Remove the fuse drawer With your fingernails squeeze together the two ends of the fuse drawer and pull it out of its slot 3 Replace the fuses w...

Page 68: ...suitable source of dry air is available where camera accessories are sold They are intended for use in cleaning fine and delicate camera equipment If this cleaning method fails to produce satisfactory...

Page 69: ...your instrument require warranty service contact Fluke Biomedical at 440 248 9300 Description Part Number AC Line Cord USA CO 19 AC Line Cord Europe CEE 7 7 86512060 AC Line Cord UK Ireland 86583000 A...

Page 70: ...35040 Operators Manual Blank Page...

Page 71: ...Appendix A Sample Customization Reports A 1 Sample Documents This section contains sample documents that the Customization Software can produce It produced these documents on a HP LaserJet All of them...

Page 72: ...35040 Operators Manual A 2...

Page 73: ...Appendix Sample Customization Reports A A 3...

Page 74: ...35040 Operators Manual A 4...

Page 75: ...Appendix Sample Customization Reports A A 5...

Page 76: ...35040 Operators Manual Blank page...

Page 77: ...automatic leakage compensation status and promotes easy recognition of leakage compensation status Increased maximum effective time from 59 min 59 9 s 3 599 9 s to 5 h 33 min 19 9 s 19 999 9 s B 2 2 T...

Page 78: ...on Repeatability counts 200 00 pC 0 01 pC 5 2 0000 nC 0 0001 nC 1 5 20 000 nC 0 001 nC 2 5 200 00 nC 0 01 nC 1 2 0000 C 0 0001 C 1 20 000 C 0 001 C 1 200 00 C 0 01 C 1 2 0000 mC 0 0001 mC 1 20 000 mC...

Page 79: ...xposure time measurement value B 3SETUP B 3 1 Making Non Timed Exposure Measurements With Automatic Leakage Compensation Disabled The instrument must be manually reset before each exposure when automa...

Page 80: ...mer interval field and use the UP and DOWN arrows to select a timer interval from the programmed list Refer to Section B 7 for information on how to program the interval list Press the TEST FUNCTION b...

Page 81: ...ision charge and current scale factors battery and bias voltages automatic leakage compensation settings and timer settings When the Test Function screen is displayed pressing the TEST FUNCTION button...

Page 82: ...ective exposure time display setting To change the effective time format setting press the TEST FUNCTION button to show the cursor and use the UP and DOWN arrow buttons to select either seconds SECOND...

Page 83: ...buttons to increment and decrement the value respectively Nominal values for the start and stop thresholds are 1 3 and 1 2 pA respectively However depending on the system leakage other values may be...

Page 84: ...aces setting Use the UP and DOWN arrow buttons to toggle the setting between zero 0 and one 1 Zero decimal places displays time in whole seconds while one decimal place displays time to a tenth of a s...

Page 85: ...annunciator when more than one is applicable Figure B 8 Annunciator Positions Table B 2 lists the indicators the instrument uses to signal that a measurement quantity has not been compensated for leak...

Page 86: ...tity Table B 3 Overrange Conditions Condition Overranged Measurement1 charge 19 999 mC charge average current accumulated charge effective exposure time accumulated charge 1 0000 C accumulated charge...

Page 87: ...the timer interval s s A C C 1 2 Leakage 1 2 Timed T T I Q Q Q ADCF ICCF Q Dose Timed Timed Units C C Q1 represents the next sample of charge at time T1 following the activation of the timer Q2 corres...

Page 88: ...t for repair 4 Bias calibration settings are invalid Do NOT make measurements Return instrument for repair 5 Ion chamber customization settings are invalid Reinstall ion chambers using the Customizati...

Page 89: ...from the Model 35040 Therapy Dosimeter The menu items are Ion Chambers Special Items Measurement Bias Settings Print and Exit B 7 2 The Measurement Menu The Measurement menu provides items Displays Ti...

Page 90: ...r function The groups consist of Configuration Amps Coulombs Volts Dose Rate and Time Table B 4 provides a listing of all the display lines available for each group along with a representation of the...

Page 91: ...ge Current Leakage pA Bias Voltage IC Bias V CEP Charge nC Current pA Accumulated Charge nC ACCUM Average Current pA AVG Timed Charge nC s Amps Coulombs Volts Predicted Timed Charge nC PREDICT Leakage...

Page 92: ...the Measurement menu Select CANCEL or press ESC to discard any changes and return to the Measurement menu The Model 35040 Therapy Dosimeter displays the timer intervals in the same order they are ente...

Page 93: ......

Page 94: ...Fluke Biomedical Radiation Management Services 6045 Cochran Road Cleveland Ohio 44139 440 498 2564 120 Andrews Road Hicksville New York 11801 516 870 0100 www flukebiomedical com rms...

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