Micro-Analyst Micro R Survey Meter User`s Manual
Contents
1. 6801 Cochran Road Solon Ohio 44139 USA Telephone 440 248 7400 Toll Free 800 472 5656 Fax 440 349 6581 http www bicron com BICRON NE Micro Analyst Micro R Survey Meter User s Manual Publication No 1019 0 U 1198 002 Release Date November 20 1998 Part No 1019900 Rev C SAINT GOBAIN INDUSTRIAL CERAMICS m Saint Gobain Industrial Ceramics Inc ISO 9001 Quality System Certified Publication Number 1019 0 U 1198 002 Part No 1019900 Rev C Replaces and supersedes 1019 0 U 1297 001 Part No 1019900 Rev B Original Issue July 1984 NOTICE reserves the right to make changes to any product to improve reliability function or design and does not assume any liability arising from either application or use of any product or circuit described herein Information presented in this publication has been carefully checked and is believed to be entirely reliable however no responsibility is assumed for inaccuracies Furthermore the information does not convey to the user any license under the patent rights of BICRON NE or others Specifications subject to change without notice LIMITED RIGHTS LEGEND The data in this manual is considered proprietary data It may be duplicated and used by or on behalf of the customer with the express limitations the proprietary data may not be disclosed outside the customer or be used for purpose2. ERE a 9 986031 SULDER 60 40 1 R26 8568104 68 OHM 1 4W FILM 8 7 8800004 0 RESISTER 1 6 sn 9720001 SOUNDER sd REF 5 ________ 9700004 7 PDSITIDN REF DRAWING ra e ________ 9780002 24 PIN HEADER 1i Li ________ 9410011 5 BOARD QTY TOLERANCES UNLESS 50 OTHERWISE SPECIFIED 2 5 SWITCH BOARD SUB ASSEMBLY H Pohe caca re 1019020 DO NOT sc pant
3. BOT COO FAN SOLON OHO 44130 UBA 0 1019920 Eod RE COMPONENT __ _ ____ _____ _9410010 1 P C BOARD MAN 1 z 9940651 2 Nuts TCR Ty 532 8 1 70 24 PIN CONNECTOR T 1 SOC Pres 49 9K 1 4W 1 ean enou 3 787772 150K 1 4W 5 Po 811004 5 RES ____ R20 R27 R5 10 8549914 5 RES 4 99 1 4w 1 R 8147014 CLOSEST TO R2 TRIMPOT Ee TO PROVIDE TEST POINT R58 14 2568104 1 RES 6810 1747 1 Pees 3 umor sa Ri Riz R2 21 8110054 4 R25 RM RIS LEER etr RES IMEG 1 4W a HIER T Ce anis _ 25 8582524 1 mes 52 5K 1 4W 1X 26 9595011 1 R30 27 8524904 1 1 4W 1X eas 28 85104 1 1 RES 1 4W 1 ___246 54 8520054 1 RES 200K 1 4W 1 R49 35 8525724 1 RES 23 7 1 48 1 Eis mo fas 652744 z RES 276K ___ RNI 37 8822051 RES NETWORK 220K x 7 c22 2 cz C19 39 9201022 5 CAPACITOR 0 001 _ pcs 4o c6 C7 c23 45 9211031 5 3 ___ 44 9232251 1 CAPACITOR 224 ___69
4. When the control is set fully counter clockwise the window lever and LLD level are equal By turning the control clockwise a larger range of energies can be detected Adjusting this control does not affect the LLD setting nor is the control functional in the UR h mode Note If the energy range set by the window and LLD is too wide energies adjacent to those of interest may be counted by the SCA resulting in lower discriminating ability The window should be set to provide the maximum discriminating ability which will produce usable readings for given surveying situation 4 3 HV Adjustment The high voltage to the internal detector is factory set during calibration and should not require adjustment An internally mounted trim pot is provided for adjusting the HV during calibration Clockwise rotation of this control increases the HV while counterclockwise rotation decreases it It may take a few seconds for the HV to decrease following a counterclockwise adjustment Note The user will invalidate the factory calibration by changing the HV setting Note An setting in excess of 1500 may cause damage to the internal detector 5 0 Radiation Measurements To make a radiation measurement 1 Perform all safety practices 2 Select the response time see Section 7 0 Selectable Response Time audio see Section 6 0 Audio mode and measurement range settings appropriate to the survey situation 3 Multiply
5. Acceptance Procedure found in Appendix A Recalibration is required after servicing and at regular intervals specified by appropriate regulatory agencies Micro Analyst Micro R Survey Meter Page 12 1019 0 U 1198 User s Manual BLANK PAGE Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page A 1 User s Manual Appendix A QC Acceptance Procedure No 1019937 1 0 Preparation impedance internal detector HV wire 1000 megohms to the Adjust the 1 Perform a visual inspection of the finished high voltage supply using R45 50 Kohm product pot to 1000 VDC 43 2 Remove all 9V batteries and connect a 6 Leave the Control Switch set to HV 9 30V 05V power source across the and adjust R29 500 ohm span pot until main battery terminals on the battery the meter reads 1 0 KV board 7 Test linearity decreasing the high voltage 2 0 Preliminary Setup to 400 V The meter should read 0 4K V Perform the following calibrations 5 1 Turn the control switch OFF 8 Turn the Control Switch to bat The ically zero the meter using the zero meter should read approximately full scale adjustment screw at the rear of the meter with the 9 30 V power supply Reduce barrel the power supply to 6 50 V 0 5 V The meter should read near the bottom of the 2 Turn the control switch to 1000 Check bat ok band the 5V supply at Pin 1 of U6 ICL 7663 The reading should be 5 VDC 3 0 Response Switch Test 0 5 V 1
6. are within the window 4 0 Setup The mode requires no user setup adjustments since the single channel analyzer is not used in this mode The SCA mode has user adjustable controls and may be set up as follows 1 Position a reference source of the energy of interest in a fixed geometry near the case front 2 Adjust the lower level discriminator Sec 4 1 Lower Level Discriminator until a maximum reading is obtained on the meter 3 Check the contribution of other energies to the reading by removing the source If the reading remains high further adjustments may have to be made The window setting may also require adjustment Sec 4 2 Window Note Any user adjustment to the HV setting will invalidate the unit s factory calibration 4 1 Lower Level Discriminator This control an internally mounted trim pot is used to determine the lower boundary level of energies that can be detected in the SCA mode Energies below the LLD setting will not be detected Turning the control clockwise raises the lower energy level threshold Adjusting this control does not affect the window setting nor is the control functional in the mode 4 2 Window This control on the internally mounted trim pot is used to determine the upper boundary level of energies that can be detected in the SCA mode Micro Analyst Micro R Survey Meter Page 10 1019 0 U 1198 User s Manual 4 0 Setup cont d 4 2 Window cont d
7. battery holder may be used as storage for spare or parallel wired for longer service before replacement Battery Life Greater than 100 hours or greater than 200 hours with parallel option Micro Analyst Micro R Survey Meter Page 8 1019 0 U 1198 User s Manual 1 0 General Description cont d 1 2 Specifications cont d Display Ruggedized recessed high torque 1 mA meter with 3 35 inch 8 51 cm scale marked 0 5 and 0 2 0 kilovolts with bat ok band Meter protected by impact resistant Lexan polycarbonate window Geotropism Within 2 of full scale Shock 100g per lightweight machine of MIL STD 202C method 202B Vibration 5g in each of three mutually orthogonal axes at one or more frequencies from 10 33 Hz Construction Splash proof shock proof two piece all metal case Scratch resistant laminated control panel and BICRON Kleen Krome trim on case tip durable black polyurethane painted handle and case bottom Size 4 25 X 8 X 7 5 in including handle 10 8 X 20 3 X 19 1 cm Weight 2 7 Ibs 1 2 kg Audio built in speaker with panel mounted on off switch provides audible click for each detector pulse With the speaker off an audible alarm sounds if desired when meter reading is greater than full scale on any range 2 0 Battery 2 1 Type 9 volt Mallory MN1604 or equivalent 2 2 Replacement Procedure 1 Turn instrument off 2 Open pull catches at ends of case
8. the response switch to fast and the 3 Adjust the high voltage supply to its Control Switch to X1000 lowest value by turning R45 completely counterclockwise 2 Connect a variable frequency pulse generator to test point 2 pin 5 of the 24 4 Leave the control switch set at X1000 pin connector or use a small check Connect a voltmeter between pins 1 source in conjunction with the internal ground and 15 of the 24 pin connector scintillation detector Adjust R31 50 kohm zero pot until the voltmeter reads 1 mVDC 2 5 mV 1 3 Vary the frequency while switching mV between fast and slow and check for appropriate differences in response time 5 Turn the control switch to HV and connect a high voltage measuring device 4 Repeat Step3 for the X100 X10 and X1 ranges Micro Analyst Micro R Survey Meter Page A 2 1019 0 U 1198 User s Manual Appendix A QC Acceptance Procedure No 1019937 cont d 4 0 Audio Test the window R4 5 kohm pot fully clockwise 1 Turn the audio switch ON and ensure that it functions properly on all four 5 Adjust the HV control R45 a 50 kohm counting ranges using the pulse generator pot until the meter begins to respond to or a check source Also check that the the pulses Observe that the pulse height audio remains silent when the selector is 100 to 150 millivolts switch is on bat and HV 6 Set the lower level discriminator control 2 Turn the audio switch to OFF and the
9. OF AND DOES NOT PROVIDE RELIEF FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KINDORNATURE INCLUDING BUT NOT LIMITED TO LOSS OF USE LOSS OF SALES OR INCONVENIENCE THE EXCLUSIVE REMEDY OF THE PURCHASER IS LIMITED TO REPAIR RECALIBRATION OR REPLACEMENT OF THE SYSTEM AT BICRON NE s OPTION This warranty specifically excludes the following items which are covered by their original manufacturers warranties photomultiplier tubes GM and proportional tubes crystal and other solid state detectors and batteries Micro Analyst Micro R Survey Meter Page 6 1019 0 U 1198 User s Manual PROCEDURES and CAUTIONS The equipment herein described is designed and manufactured in compliance with all applicable safety standards Nevertheless certain hazards are inherent in the use of electronic and radiometric equipment Adequate warnings are included in this manual and on the product itself to cover hazards that may be encountered in normal use and servicing of this equipment No other procedures are warranted by Bicron It shall be the owner s or user s responsibility to ensure that the procedures and cautionary notes are heeded Failure on the part of the user in any way to follow the prescribed procedures shall absolve Bicron and its agents from any resulting liability This instrument is intended solely for the detection and measurement of ionizing radiation It should be used only by persons who have been trained in the proper interpretatio
10. Survey Meter Page 4 1019 0 U 1198 User s Manual BLANK PAGE Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page 5 User s Manual BICRON NE WARRANTY STATEMENT COVERING PORTABLE MONITORS Instruments and options manufactured by BICRON NE are warranted against defects in materials and workmanship for a period of two years from the date of shipment unless otherwise agreed upon by BICRON NE and the customer in writing BICRON NE s obligation with regard to such products shall be limited to repair or replacement FOB BICRON NE factory or authorized repair station at BICRON NE s option The calibration when applicable for each system is warranted to be within its specified accuracy at the time of shipment If this initial calibration is determined to be in error the system will be recalibrated at no charge The aforesaid warranty does not cover systems options or probes which are subject to excessive physical abuse or are used for purposes other than those intended In no event shall BICRON NE be liable for consequential or special damages transportation installation adjustment work done by customer or other expenses which may arise in connection with such defective product or parts EXCLUSION OF LIMITED WARRANTY THERE ARE NO WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF THIS EXPRESS WARRANTY EXCLUDES COVERAGE
11. ___ 45 9251051 1 CAPACITOR 107 _____ c10 C13 617 46 9212241 3 OF paver an p r 14 MT eapacrton 2202 1780 FUA E ____ 50 8800004 24 0 onm RES 0 4 SPACING 151 8800000 4 0 ohm RES 0 5 SPACING 52 8800000 1 er locas ee Hi 964000 t 3302 0 ___02 1541 9650004 1 wc 14558 BCP 1 Ls 55 9650001 raos v4 u3 55 9640001 2 51602 ____06 ____ 57 sr 1 765 cpa ic 139 960000 Eie ope 63 95000 1 1 TRAN FORM R_MB149 C26 __ 64 9213321 1 CAPACITOR 0 0033uF gt CAPACITOR ET 2 C Sas ss 9550001 SWITCH SPST 9610005 1 TRANSISTOR 285210 mponent Side 5 MANUEL UPDATE REQUIRED EN zu exo S BOARD ASSEMBLY 30 RES MICRO ANALYST S bam e 2 TOP HOLES LONG PIN C 602 NOTE INSTALL HEADER P N 2 IN PCB USING ASSEMBLY FIXTURESCON CIRCUIT SIDE 0001 AND 0002 3 15 9297301 5 PINS ee YLON WASHER W SETTING REF DRAWING 2 12 9820002 WIRE RED 24 TEFLON un 19820001 2 WIRE BLACK 246A TEFLON
12. and separate case bottom from top 3 Install battery in appropriate clip on bottom circuit board clip for spare battery is so marked observing proper polarity 4 Replace bottom orienting rubber pad under battery close catches Parallel Wired Option Instruments with this option have both battery clips wired into the circuit Installing a second battery thus provides twice the operational hours of one battery However only one battery is needed to power the instrument 2 3 Safety Practices 2 3 1 Battery Test Turn control switch to the bat position a meter reading within the bat OK range should be observed This test allows monitoring of the battery 2 3 2 High Voltage Measurement Turn control switch to the HV position The detectors high voltage is directly displayed on the lower meter scale The high voltage is set by the factory during calibration Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page 9 User s Manual 3 0 Operational Modes 1 uR h Mode In this mode the observed meter reading is the total exposure rate produced by all the energies the internal probe is capable of detecting in The single channel analyzer is automatically overridden and its con trols have no effect on the readings 2 SCA Mode In this mode the instrument will discriminate against all energies not in the analyzer window The exposure rate readings observed in are for those energies which
13. battery in the appropriate battery holder either holder may be used when holders are parallel wired A R h 2 Complete date and sign a Certificate of 14 Adjust the frequency of the pulse Calibration generator so that it is 1 400th of the value noted in step 10 The meter should read 1 uR h 10 15 Note the four observed calibration points from the X10 calibration on a Certificate of Calibration 16 Disconnect the pulse generator Set the high voltage to the value recorded in Section 5 0 Analyzer Test Adjustment Step 5 Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page A 5 00 UsersManal __ Appendix B Suggested Spare Parts List We recommend that you keep some quantity of the following spare parts in inventory The number of instruments you own and the severity of your operating conditions should guide you in determining specific quantities Description Part No Main PC Board Assembly 1019010 Switch PC Board Assembly 1019020 Detector Battery PC Board Assembly 1019030 Case Top Assembly 2029140 Meter 9400020 Meter Window 940001 1 Case Bottom Assembly 1019050 Knob Function 9770003 Knob Audio Response Analyzer 9770001 Micro Analyst Micro R Survey Meter Page A 6 1019 0 U 1198 User s Manual BLANK PAGE Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page A 7 User s Manual Appendix C Parts List No 1019910 Description Part No Main PC Board Assembly 1019010 Swit
14. been properly set approximately 1 volt be tween pin 1 according to Section 5 0 Analyzer Test and ground and pin 5 test point 2 of the Adjustment Step 5 24 pin connector 1 Set the control switch to the X1000 10 Adjust the frequency of the pulse range Set the Mode Switch to the generator until the meter reads 400 A R h position Note this frequency 2 Expose the unit to a Cs field of 4000 11 Set the Control Switch to the X10 4 mR h Adjust R21 X1000 range Adjust the frequency of the pulse calibration pot until the meter reads 4000 generator so that it is one tenth of the AR h value noted in step 10 Adjust R17 X10 calibration pot until the meter reads 40 3 Expose the unit to a Cs field of 1000 1 mR h The meter should read 1000 10 12 Adjust the frequency of the pulse generator so that it is 1 40th of the value 4 Set the Control Switch to the X100 noted in step 10 The meter should read range 10 410 Micro Analyst Micro R Survey Meter Page A 4 1019 0 U 1198 User s Manual Appendix A QC Acceptance Procedure No 1019937 cont d 6 0 Instrument Calibration cont d 7 0 Wrap Up 13 Set the Control Switch to the X1 range 1 Remove all test equipment Turn the Adjust the frequency of the pulse generator so that it is 1 100th of the value noted in step 10 Adjust R15 XI calibration pot until the meter reads 4 instrument off and install a new 9V
15. ch PC Board Assembly 1019020 Detector Battery PC Board Assembly 1019030 Detector Assembly 1019230 Mounting Bolts 9100046 Case Top Assembly 2029140 Handle 9710001 Meter 9400020 Meter Window 9400011 Meter Support Bracket 9850002 Case Bottom Assembly 1019050 Miscellaneous Battery 9V alkaline MN1604 9750001 Knob Function 9770003 Knob Audio Response Analyzer 9770001 Micro Analyst Micro R Survey Meter Page A 8 1019 0 U 1198 User s Manual BLANK PAGE Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page A 9 User s Manual Appendix D The drawings listed below follow this page Drawing Name Number Rev Schematic Circuit Diagram 01019920 Main Board Assembly 01019010 Switch PC Board Assembly B1019020 C Micro Analyst Micro R Survey Meter Page A 10 1019 0 U 1198 User s Manual BLANK PAGE 10K 1 SWIA gae u R2 3 R 10K WINDOW N R46 200K 11 Raa sore apuust SOK 470K 02 U1 8 N us 6 2 7K c23 013 014 015 R36 1000 1 Bos 16 R39 1x 7 6 ore 100K 1M 15 617 22uF 1 47K N R41 150K 500 1500 019 10 FRONT 144001 BOARD AUXILIARY x 9 VOLT BATTERY 25 U1 2 14 N 284124 626 9033uF 5 244126 7 RS7 10K TIVES RADIATION
16. ety of the operator with respect to this product responsibility for any safety consequences as a result of erroneous data lies solely with the operator NOTE notices always appear in italics Micro Analyst Micro R Survey Meter 1019 0 U 1198 User s Manual TABLE OF CONTENTS Section Standard Warranty Exclusion of Warranty Procedures and Cautions 1 0 Introduction 1 1 General Description 1 2 Specifications baie ede 2 0 Battery ZW MVD eleme nU WS ARUM tes 2 2 Replacement Procedure 2 3 Safety Practices 2 31 Battery ERA 2 3 2 High Voltage Measurement 3 0 Operational Modes 4 0 Setup 4 1 Lower Level Discriminator 6 43 Adjustment v othe oes athe 5 0 Radiation Measurements 6 0 Audio eu Rid 7 0 Selectable Response Time 8 0 Circuit Description 9 0 Calibration Appendices Appendix QC Acceptance Procedure Number 1019937 Suggested Spare Parts 181 Parts List Number 1019910 cox ects bh pid Page 3 Micro Analyst Micro R
17. g the instrument more versatile than a standard micro R meter 1 2 Specifications Radiation Detected gamma X ray Range 0 5000 in four linear ranges Accuracy Within 1046 of reading between 2096 and 100 of full scale on any range Detector Internally mounted 1 X 1 in Nal Scintillator High Voltage Electronically stabilized factory set during calibration with readout on the meter Warmup Time None Modes Selected by front panel rotary switch as follows AR h Readings based factory calibration for Cs in micro roentgens per hour overrides single channel analyzer SCA settings SCA Readings in for energies within the analyzer window only Single Channel Analyzer Settings Lower Level Discriminator Adjustable over a 1V range above factory set minimum with internal potentiometer Window Adjustable from 0 to 1V above the lower level discriminator with internal potentiometer Pulse Pair Resolution Typically 10 us or less Response Time Switch selectable optimized for each range 0 90 of final reading as follows Range Time Fast Slow X1 12 sec 20 sec X10 1 sec 8 sec X100 1 sec 2 sec X1000 1 sec 1 sec Temperature Operational from 20 to 50 Humidity Less than 5 change in reading from 10 95 RH Control Seven position rotary switch off bat HV X1000 X100 X10 Battery Complement Single nine volt MN1604 or equal The additional
18. internal 11 Unless otherwise specified set the HV scintillation detector control until the pulses observed on the oscilloscope are 2 0 volts in amplitude 4 Set the lower level discriminator R2 5 The gain in now set to measure energies kohm pot fully counterclockwise and above approximately 50 keV in the Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page A 3 User s Manual Appendix A QC Acceptance Procedure No 1019937 cont d 5 0 Analyzer Test and Adjustment cont d 5 Expose the unit to a Cs field of 400 Adjust R19 X100 calibration pot UR h position Measure and record the until the meter reads 400 high voltage setting on the Certificate of Calibration 6 Expose the unit to a Cs field of 100 The meter should read 100 12 When the sca position is selected the 10 lower level discriminator may be set by the user from 50 keV fully counter 7 the four observed calibration points clockwise to approximately 350 keV on a Certificate of Calibration fully clockwise and the window width may be set from 0 fully counter 8 Turn off the system high voltage by clockwise to approximately 350 keV rotating R45 fully counterclockwise always constant above the LLD 9 Leave the Control Switch on the X100 6 0 Instrument Calibration range Connect a variable frequency Before performing this procedure be sure negative going pulse generator amplitude the high voltage has
19. low X1 12 sec 20 sec X10 1 sec 8 sec X100 1 sec 2 sec X1000 1 sec 1 sec 8 0 Circuit Description The electronic circuitry in the micro analyst is contained on three interconnected printed circuit boards Modern solid state integrated circuitry is used throughout The major components are 1 High voltage power supply A feedback regulated electronically stabilized supply for the detector potential Additional circuitry provides HV readout on the meter scale 2 Count rate meter linear charge pump ratemeter converts the detector pulses to an exposure rate reading on the calibrated meter scale The circuitry includes a unique resolving time compensation technique to provide linear response over the full range automatic and manual time constant selection and temperature compensation 3 Audio circuitry for individual pulse counting and over range alarm 4 Single channel pulse height analysis 9 0 Calibration The instrument is normally calibrated in the uR h mode to read in micro for Cs Since it is difficult or impossible to obtain precise exposure rates for the calibration of the X10 and X1 ranges a combination of isotopic Cs field and electronic pulse generator means is used to fully calibrate the unit Individual calibration controls provided for each range The locations of these controls are shown on a label in the case bottom A detailed calibration procedure is part of the QC
20. n of its readings and the appropriate safety procedures that should be followed in the presence of radiation All instructions and warnings contained in this manual or on the instrument must be read before use and must be strictly followed Failure to follow these instructions and warnings may result in inaccurate readings and or user hazard Indicated battery and other operations tests must be performed prior to each use to assure that the instrument is functioning properly CAUTION FAILURE TO CONDUCT PERIODIC PERFORMANCE TESTS IN ACCORDANCE WITH ANSI N323 1978 PARAGRAPHS 4 6 AND 5 4 AND TO KEEP RECORDS THEREOF IN ACCORDANCE WITH PARAGRAPH 4 5 OF THE SAME STANDARD COULD RESULT IN ERRONEOUS READING OF POTENTIAL DANGER ANSI N323 1978 BECOMES BY THIS REFERENCE A PART OF THIS OPERATING PROCEDURE INSPECTION Instruments should be examined and tested as soon as received Claims for transportation damages if any should be filed at once with the delivery carrier Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page 7 User s Manual 1 0 Introduction 1 1 General Description The BICRON NE model is a state of the art micro R survey meter featuring an internal Nal scintillation detector built in audio HV readout on the meter and a single channel analyzer with uR h readout The addition of the single channel analyzer provides energy discrimination and background reduction capabilities makin
21. rocedures B a Suggested Spare Parts List C a complete Parts List so the instrument can be repaired on site and D schematic and pictorial drawings to facilitate repair procedures Micro Analyst Micro R Survey Meter Page 2 1019 0 U 1198 User s Manual FOREWORD cont d In order to maintain consistency throughout this and all BICRON NE manuals certain writing conventions have been followed for safety warnings They are divided into three categories and defined as follows DANGER indicates an imminently hazardous situation which if not avoided will result in death or serious injury DANGER NOTICES ALWAYS APPEAR IN BOLD ITALICIZED UPPER CASE LETTERS WARNING indicates potentially hazardous situation which if not avoided could result in death or serious injury WARNING NOTICES ALWAYS APPEAR IN UPPERCASE BOLD LETTERS CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices CAUTION notices always appear in bold italicized letters The definition of these safety warnings is according to ANSI Z535 4 The style of the warnings bold italicized etc is 5 In addition to the above we have added the following warning NOTE indicates a situation which has the potential for erroneous data collection or damage to equipment but which does not directly affect the saf
22. s of manufacture without prior permission of the seller This legend shall be marked on any reproduction of this data in whole or in part C Copyright Saint Gobain Industrial Ceramics Inc 1998 All rights reserved Printed in U S A Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page 1 User s Manual FOREWORD This manual provides basic installation operation and maintenance procedures for the Bicron Micro Analyst Micro R Survey Meter Section 1 0 Introduction provides a general description of the instrument and its operation and a detailed listing of its physical and performance specifications Section 2 0 Battery describes the procedure for installing and testing the batteries Section 3 0 Operational Modes describes the uR h and SCA operating modes of the instrument Section 4 0 Setup describes the user adjustable controls for the SCA mode Section 5 0 Radiation Measurements describes how to measure radiation Section 6 0 Audio describes the function and control of the internal speaker Section 7 0 Selectable Response Time describes how to tailor response times to specific survey situations Section 8 0 Circuit Description provides a brief description of the four major compon ents of the instrument s electronic circuitry Section 9 0 Calibration provides directions for calibration of the instrument The Appendices QC Acceptance Procedure which includes calibration p
23. the meter reading by the range setting to obtain the reading in microroentgens per hour Radiation incidents on the front sides and bottom of the case will be detected Note The exposure rate readings obtained when using the mode are based on factory calibration performed in Cs radiation field see Section 9 0 Calibration Note To determine proper operation of the instrument you must use an external source of ionizing radiation of the type the instrument was designed to measure 6 0 Audio An internal speaker will produce an audible click for each detector pulse This speaker is controlled by a panel mounted on off switch labeled audio An audible alarm will sound when the meter is approximately 30 percent or more above full scale on any range This over range alarm can be disabled by turning off the internal on off switch located on the main circuit board The over range alarm will function only when the panel mounted audio control is turned off and the internal switch is turned on When the speaker control is in the on position the over range alarm is disabled Micro Analyst Micro R Survey Meter 1019 0 U 1198 Page 11 User s Manual 7 0 Selectable Response Time In addition to the built in circuitry that optimizes response time for each range a front panel switch labeled response fast slow may be used to tailor response time to the survey situation as shown below Range Time Fast S
24. to its mid range position Alarm On off Switch mounted on the main PC board to ON Drive the meter 7 Increase the HV control until the meter well beyond full scale with the pulse begins to respond to the pulses Observe generator or check source and confirm that the pulse height is 800 to 1200 that a continuous tone is heard Do this millivolts on all four ranges 8 Without changing the HV setting turn the 3 Disconnect the pulse generator if used lower level discriminator control counterclockwise and observe that the 5 0 Analyzer Test and Adjustment meter reading increases 1 Turn the Mode Switch to sca the 9 Turn the window control counter Range Switch to 1000 and the audio clockwise and observe that the meter off reading drops to zero 2 Connect an oscilloscope with an X10 10 Unless otherwise specified set the lower probe impedance gt 10 megohms level discriminator at 250 mV and the capacitance lt 20 pf between test points window control at 400 mV To measure 2 pin 5 of the 24 pin connector and the lower level discriminator voltage ground pin 1 of the 24 pin connector connect a voltmeter between the center Set up the oscilloscope to measure 1 wiper of R2 and pin 6 of U1 To measure microsecond per division AC coupled the window setting connect a voltmeter negative triggered between the center wiper of R4 and pin 6 of Ul 3 Place a small Cs check source typically 8 near the front end of the
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