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Surveyor M Portable Count-Rate Meter With Digital Scaler Option User's Manual
Publication No. 1064-0-U-0594-001 * * * Release Date * * * May 19, 1994
Part No. 1064902 Bicron Saint-Gobain/Norton Industrial Ceramics Corporation 6801 Cochran Road ! Solon, Ohio, U.S.A. 44139 1-800-472-5656 1-216-248-7400
Publication Number: 1064-0-U-0594-001 Part No. 1064902 Original Issue
NOTICE Bicron 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 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 purposes 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/Norton Industrial Ceramics Corporation, 1994 All rights reserved Printed in U.S.A.
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual FOREWORD This manual provides the basic installation, operation, and maintenance procedures for the Bicron Surveyor M Portable Count-Rate 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 Installation describes the procedure for changing the battery and checking its performance. Section 3.0 Setup describes the settings for the GM Probe and the Scintillation Probe, and how to set the High Voltage. Section 4.0 Operation provides a detailed description of all the features, settings, and complete operating instructions for the Surveyor M. Section 5.0 Circuit Description provides a brief description of the three electronic circuits that make up the instrument. Section 6.0 Calibration provides directions for calibration of the instrument. The Appendices are: A) QC Acceptance Procedure which includes calibration procedures, B) a complete spare parts list so instruments can be repaired on-site, and C) schematic and pictorial diagrams to facilitate repair procedures. Page 1
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Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual TABLE OF CONTENTS Section Page Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Procedures and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.0 Introduction 1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.0 Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Battery Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 High Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . 9 9 9 9 Page 3
3.0 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 GM Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Scintillation Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 High Voltage Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.0 Operation 4.1 Radiation Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 External Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.3 Internal Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.0 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.0 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Appendices QC Acceptance Procedure, Number 1064930 . . . . . . . . . 17 Spare Parts List, Number 1064910 . . . . . . . . . . . . . . . . . . 21 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
A B C
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STANDARD WARRANTY Instruments and options manufactured by Bicron 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 and the customer. Bicron's obligation with regard to such products shall be limited to repair or replacement, FOB Bicron factory or authorized repair station, at Bicron's option. The calibration (when applicable) for each instrument is warranted to be within its specified accuracy at the time of shipment. If this initial calibration is determined to be in error, the instrument will be recalibrated at no charge, provided it is returned as described above.
EXCLUSION OF WARRANTY The aforesaid warranty does not cover instruments, options or probes that are subject to excessive physical abuse or are used for purposes other than those intended. In no event shall Bicron be liable for consequential or special damages, transportation, installation, adjustment, work done by the customer or other expenses that may arise in connection with such defective product or parts. There are no warranties, express or implied, including without limitation any implied warranty of merchantability or fitness, which extend beyond the description of the face hereof. This express warranty excludes coverage of and does not provide relief for incidental or consequential damages of any kind or nature, 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 instrument at Bicron's option. This warranty specifically excludes the following items which are covered by their original manufactures' warranties: photomultiplier tubes, GM and proportional tubes, crystal and other solid-state detectors, and batteries.
Surveyor M Portable Count-Rate Meter Page 6 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 the 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 interpretation 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. 1064-0-U-0594
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.
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual 1.0 Introduction 1.1 General Description The Bicron SURVEYOR M is a versatile, portable, count-rate meter used for the detection and measurement of ionizing radiation when equipped with an appropriate GM (Geiger-Mueller) or scintillation probe. Its adjustable high voltage with readout on the meter enables the user to interchange GM and scintillation detectors with ease. The optional built-in digital scaler provides counting times of 0.1, 1.0, and 10 minutes. The scaler features a crystal-controlled timebase for greater accuracy. The unit features a recessed meter movement, single ON-OFF-range selector switch, MHV probe connector, mounted probe holder, front-panel high voltage adjustment, switch-selectable response time, and built-in audio. Also included are internally mounted controls for GM tube anti-saturation, dead-time compensation, and full scale alarm. 1.2 Specifications Radiation Detected: Alpha, beta, gamma, and X-ray, depending upon detector used. Range: Four linear ranges of 01000, 0-10,000, 0-100,000, and 01,000,000 CPM (Counts per minute). Accuracy: Within 10% of reading between 20% and 100% of full scale on any range. Detector: Choice of GM and scintillation probes. Figure 1 External Controls High Voltage: Electronically stabilized, adjustable to at least 1600V with readout on the meter. External Controls: Seven-position rotary switch: off, battery check, high voltage, scales X1000, X100, X10, X1; rotary audio and response switches; rotary high voltage adjustment control (Figure 1). Internal Controls: Slide ON/OFF switches for controlling GM probe anti-saturation, dead-time compensation, and full-scale alarm. Page 7
Surveyor M Portable Count-Rate Meter Page 8 User's Manual 1.0 Introduction (cont'd) 1.2 Specifications (cont'd) Connector: MHV. Warm-up Time: None. Saturation: Switch selectable; typically greater than 1000 R/h on the X1, X10, and X100 ranges - for most GM probes; greater than 5 R/h for pancake GM detectors. Response Time: Switch-selectable, optimized for each range, 0-90% of final reading as follows:
Range X1 X10 X100 X1000 Fast 12 sec. 1 sec. <1 sec. <1 sec. Time Slow 20 sec. 8 sec. 2 sec. 1 sec.
1064-0-U-0594 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 10-33Hz. Construction: Splash-proof, shock-proof, two-piece all-metal case. Scratch-resistant laminated control panel and Bicron KleenKrome® trim on case top, durable black polyurethane paint on handle and case bottom, stainless steel probe clip. Audio: A 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 is greater than full scale on any range. Scaler: 6-digit, 0.2" high LCD display with three internally set time periods - 0.1, 1.0, and 10 minutes; crystal-controlled time base has an accuracy better than 0.1%. Size: 10.8 X 20.3 X 17.3cm (4.25 X 8 X 6.8 inches), including handle and probe clip. Weight: 1 kg. (2.2 lbs.), excluding probe.
Temperature: Operational from -20 to +50 oC. Humidity: No more than 5% change in reading from 10-95% Relative Humidity. Battery Life: Typically 100 hours (200 hours with parallel option) for GM probes in normal background, and 50 hours (100 hours with parallel option) for scintillation probes. Sustained use of audio may reduce life to less than these values. Display: Ruggedized, recessed, high-torque 1 mA meter with 8.5 cm (3.35 inches) scale marked 01000 counts per minute and 0-2.0 kilovolts, with "bat. ok" band. Meter protected by impact resistant Lexan® polycarbonate window.
Figure 2 Meter Scale
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual 2.0 Battery Installation The Surveyor M is delivered with a 9-volt Mallory MN 1604 battery, or equivalent. This section defines the procedures for replacement and testing of the battery. Note that some instruments have a parallelwired battery option. In this case, two batteries are wired into the circuit. Installing a second battery thus provides twice the operational hours. Only one battery is needed to power the instrument, however. 2.1 Procedure 1. Turn the instrument off. 2. Open pull catches at both ends of the case and separate the bottom of the case from the top. Install the battery in the appropriate clip on the bottom circuit board, observing proper polarity. The spare battery clip is appropriately marked. Replace the bottom part of the case, orienting the rubber pad under the battery; close the catches. 2.2 Battery Test Turn the control switch (Figure 1) to the "bat." position; the meter should display a reading within the "bat. ok" checkband. 2.3 High Voltage Measurement Turn the control switch (Figure 1) to the "HV" position. Detector high voltage is directly displayed on the lower meter scale. Page 9
Surveyor M Portable Count-Rate Meter Page 10 User's Manual 3.0 Setup Both GM and scintillation probes can be used with the Surveyor M. The choice of probe determines which setup procedure should be followed. 3.1 GM Probes The setup for GM probes requires that the high voltage be set (usually to 900V) before the probe is connected to the instrument. See Section 3.3 High Voltage Adjustment for procedural details. Recommended internal switch settings are shown in Table 1. Refer to Figure 3 for the location of the switches. CAUTION Do not use the X1000 range with GM probes. Erroneous readings may result. Do not exceed the GM probe's maximum high voltage rating. 3.2 Scintillation Probes The setup for scintillation probes requires that the high voltage appropriate to the application first be determined. To determine this high voltage setting: 1. 2. Turn the response switch to "fast". Place a small reference source of the type to be measured near the window of the probe, in a fixed geometry. Set the high voltage to zero. (See Section 3.3 High Voltage Adjustment.) With the instrument on one of its counting ranges, slowly increase the high voltage setting until counting begins. Switch to high voltage and note the voltage. Increase the high voltage by 100 volts. Switch to an appropriate counting range and note the counting rate.
GM Probe Setting either ON ON either Scintillator Probe Setting either ON OFF either
Switch ID SW3 SW6 SW7
Name Full Scale Alarm Deadtime Compensation Anti-saturation Audio
Factory Setting ON ON (Turn OFF for calibration) ON OFF
Table 1 Internal Switch Settings
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual 3.0 Setup (cont'd) 3.2 Scintillation Probes (cont'd) 8. Repeat Steps 5, 6, and 7 until you find a region where the counting rate remains relatively constant when the high voltage is varied by +50 volts (counting rate plateau). Once this plateau has been found, record the counting rate and the high voltage setting for future reference. CAUTION Do not exceed the scintillation probe's maximum high voltage rating. Recommended internal switch settings are shown in Table 1. Refer to Figure 3 for the location of the switches. 3.3 High Voltage Adjustment This control is located on the front panel for easy adjustment of the detector high voltage. The actual high voltage setting is read on the meter scale when the selector switch is in the "HV" position (Figure 1). Clockwise rotation of this control increases the high voltage, while counterclockwise rotation decreases it. Note that it may take a few seconds for the voltage to decrease following a counterclockwise adjustment. The normal factory high voltage setting is 900V. CAUTION A high voltage setting higher than the maximum high voltage specified for the probe being used may cause damage to the probe! Page 11
Surveyor M Portable Count-Rate Meter Page 12 User's Manual 4.0 Operation 4.1 Radiation Measurement 1. Determine which type probe you will be using. Check the high voltage setting (Section 2.3 High Voltage Measurement) and connect the probe. Set the appropriate external controls: audio, response, and counting range settings. See Section 4.2 External Controls for details. Set the internal switches to the appropriate settings for your operation. See Section 4.3 Internal Controls for details. Perform the survey, making sure to multiply the meter reading by the counting range setting to obtain the reading in counts per minute. Note: When using GM probes, select only the X1, X10, or X100 counting ranges; do not use the X1000 range. Any of the four ranges may be selected when using scintillation probes. 6. 2. If your meter is equipped with the optional Digital Scaler, press the Count Button on top of the case to activate the digital scaler. The Count Light will illuminate, indicating that a count is in progress. When the light turns off, the count time has been completed. Once a count is started, the Count Pushbutton is electronically locked out to prevent accidental restarting. If you wish to reset the scaler during a count, turn the instrument off for a few seconds, then turn it back on and press the Count Pushbutton again. 1064-0-U-0594
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual 4.0 Operation (cont'd) 4.2 External Controls All the external controls are located on the top of the instrument (Figure 1). Audio The Surveyor M is equipped with an internal speaker that will produce an audible click for each detector pulse. This speaker is controlled by a panel-mounted ON/OFF switch labeled "audio". If the Audio Switch is in the OFF position, an audible "over-range" alarm will sound when the meter is approximately 30% or more above full scale on any range. When the Audio Switch is in the ON position, the Over-range Alarm in not operational. The Over-range Alarm also can be disabled by turning the Internal Alarm Switch (SW3) OFF. See Section 4.3 Internal Controls for details. Response Time In addition to the built-in circuitry that optimizes response time for each range, a front panel switch labeled "response", with position "fast" and "slow" may be used to tailor response time to the survey situation. Mode/Range Selector This seven position knob selects the operating mode and the counts per minute scaling when used in survey mode. The off setting turns off all power to the unit. The bat. position tests the voltage of the battery; it should read in the "bat. ok" range of the meter. The HV setting displays the output of the high voltage circuit in kilovolts. The X1000, X100, X10, and X1 settings are various scale ranges to be selected based on the radiation being surveyed. Note that the X1000 range should be used only with the Scintillator Probe. Digital Scaler For those units equipped with a Digital Scaler, the top mounted totalizer has six digits available for displaying the total count. The Count pushbutton is used to initiate a count; the light indicates when a count is in progress. Page 13
Surveyor M Portable Count-Rate Meter Page 14 User's Manual 4.0 Operation (cont'd) 4.3 Internal Controls Three internal switches are included with the basic Surveyor M to allow user customization of some of the instrument's features. If the Scaler Option is installed, a fourth internal switch is included. Full Scale Alarm Switch This ON/OFF switch is SW3 on Figure 3. When this switch is in the ON position, the full-scale alarm circuit is enabled, and will sound only when the Audio Switch is OFF and the count rate exceeds the upper end of the meter's range by 30%. To disable the Full-scale Alarm, turn this switch OFF. The factory setting of this switch is ON. Anti-saturation Switch This ON/OFF switch is SW7 on Figure 3. When this switch in ON, the anti-saturation circuitry is enabled. This circuit is used to prevent over-range foldback of GM probes due to GM tube saturation. With Bicron EWGM and SWGM probes, over-range foldback is prevented in fields typically up to 1000R/h; for the Bicron PGM, it is prevented in fields typically up to 5R/h. The Anti-saturation Switch must be turned OFF whenever a Scintillation Probe is used; otherwise, the voltage divider in the probe may engage the anti-saturation circuitry erroneously. The factory setting of this switch is ON. 1064-0-U-0594
Figure 3 Main Circuit Board Assembly
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual 4.0 Operation (cont'd) 4.3 Internal Controls (cont'd) Dead-time Compensation Switch This ON/OFF switch is SW6 on Figure 3. When this switch is ON, the dead-time compensation circuit is enabled. This circuit provides dead-time loss correction for both GM and scintillation probes. Note: This switch will affect the frequencies used to calibrate the instrument on the four count-rate ranges due to the effect of the dead-time correction circuit on the analog meter reading. Typically, calibration will be performed with this switch OFF. Refer to the Q.C. Acceptance Procedure (Appendix A) for more information. The factory setting of this switch is ON. Digital Scaler Count Time Switch This three position switch (SW102 on Figure 3) controls the length of time during which the counts are totaled when using the Digital Scaler Option. The available times are 0.1, 1, and 10 minutes, as indicated on the circuit board. Be sure the instrument is turned OFF when changing the position of this switch. The normal factory setting for this switch is one minute. 5.0 Circuit Description The electronic circuitry in the Bicron Surveyor M with Digital Scaler Option is contained on four interconnected printed circuit boards. Modern solid-state integrated circuitry is used throughout. The major components are the following: 1. High-voltage power supply. This is a feedback-regulated, electronically stabilized supply for the detector potential. Additional circuitry provides high voltage readout on the meter scale. Count-rate meter. A linear charge pump ratemeter converts the detector pulses to a count rate reading on the calibrated meter scale. The circuitry includes a unique resolving time compensation technique to provide linear response over the full range with both scintillation and GM probes, automatic and manual time constant selection, and temperature compensation. Audio circuitry. This circuit provides for individual pulse counting and the Overrange Alarm. Digital scaler circuitry. Page 15
6.0 Calibration The SURVEYOR M, being a count-rate instrument, is normally calibrated electronically in counts per minute. Detailed calibration procedures are part of the Q.C. Acceptance Procedure found in Appendix A.
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Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual Appendix A Bicron QC Acceptance Procedure Number 1064930 Model: Surveyor M with Digital Scaler Option 1. Perform a visual inspection of the finished product. e. +3% via R45 (20 kohm panel mounted pot, "HV"). Leave the control switch set to "HV" and adjust R29 (500 ohm span pot, "SPAN") until the meter reads 1.0 KV. To test linearity, increase high voltage to +1600 V. The meter should read 1.6 KV +5%. Decrease the high voltage to +400 V. The meter should read 0.4 KV +5%. Page 17
Note: See Figure 3 for the location of all Circuit Board components not labeled on the board. 2. Remove the 9V battery and connect a 9.30V+.05V power source across the battery terminals on the battery board. Perform the following adjustments: 4. a. Turn the control switch OFF. Mechanically zero the meter via the rear adjustment screw on the meter barrel. Turn the control switch to X1000. Check the +5V supply at Pin 1 of U6 (ICL 7663). The reading should be 5VDC +0.5 V. Leave the control switch set at X1000 and connect a voltmeter between pins 1 (ground) and 15 of the 24-pin connector. Adjust R31 (50 kohm zero pot, "ZERO") until the voltmeter reads 1 mVDC +2 1/2, -1 mVDC. Check the voltage reading on the X100, X10, and X1 ranges. Little change should occur. Turn the control switch to "HV" and connect a high voltage measuring device with an impedance greater than 1000 megohms to the probe connector center pin. Adjust the high voltage supply to +1000 VDC
Perform a CPM Calibration. a. Turn ON SW6 (dead-time compensation), turn OFF SW7 (antisaturation). Connect a variable frequency pulse generator (amplitude of -1.5 v, pulse width of 10 microseconds) between Pin 5 and Pin 1 of the 24-pin connector header. Adjust the frequency of the pulse generator to the value listed in Table T1 required to calibrate the unit at 80% of full scale on the meter. Adjust R21 (the 5 Kohm calibration pot, X1000) until the meter reads 80% of full scale. Readjust the frequency of the pulse generator to the value listed in Table 1 required to calibrate at 20% of full scale.
Surveyor M Portable Count-Rate Meter Page 18 User's Manual Appendix A (cont'd) f. Note the meter readings from steps 4d and 4e on a Certificate of Calibration. Repeat Steps 4c through 4f for the X100 range using R19 (the 50 Kohm, X100 calibration pot). Repeat Steps 4c through 4f for the X10 range using R17 (the 500 Kohm, X10 calibration pot). Repeat Steps 4c through 4f for the X1 range using R15 (the 5 megohm, X1 pot). Turn SW6 OFF. Check the above four-range calibration, except using Table T-2 for the calibration frequencies. No adjustment to any of the four potentiometers should be required; this is a test of the linearity of the circuit without dead-time compensation. Leave the pulse generator connected when calibration is complete. Mark all trimpot bodies to show the general position of the adjustment screws after calibration. c. 7. b. 6. Test the audio as follows: a. Turn the Audio Switch ON and check to see that the audio functions properly on all four counting ranges, using the pulse generator. Also, check that the audio remains silent when the selector switch is on "bat." and "HV". Turn the Audio Switch OFF and SW3 (alarm ON/OFF switch) on the main PC board to ON. Drive the meter well beyond full scale with the pulse generator and observe that a continuous tone is heard. Do this on all four counting ranges. Disconnect the pulse generator. 1064-0-U-0594
Turn the control switch to "HV" and adjust the high voltage to +900 VDC via the front panel control. Test the antisaturation circuit as follows: a. Turn the control switch to the "X1000" position and connect a 500 megohm resistor across the probe connector (from +900V to ground). The meter should peg beyond full scale. Replace the 500 megohm resister with a 2000 megohm resistor. The meter should remain at zero. Remove the 2000 megohm resistor and reinstall the 500 megohm resistor.
Turn the response switch to "fast" and the control switch to "X1000". Vary the frequency of the pulse generator to obtain a reading near full scale and switch between "fast" and "slow" to check the operation of the response switch. Do the same for the X100, X10, and X1 ranges. Leave the pulse generator connected.
Remove all test equipment. Turn the instrument OFF and install a new 9 volt battery in the appropriate battery holder. (Either holder may be used if the holders are parallel-wired.)
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual Appendix A (cont'd) 9. Attach a probe to the instrument, observing the proper high voltage precautions. Place the probe near an appropriate check source and turn the selector switch to each of the four ranges in turn. A meter reading should be obtained for each range. "count" pushbutton. Time the count period; it should be 0.1 minutes. c. Set the digital scaler for a 1 minute count time. Turn the control switch to one of the four counting ranges and press the "count" pushbutton. Time the count period; it should be 1.0 minutes. Compare the CPM reading on the analog meter to the digital scaler total count; they should be the same. Page 19
10. If the instrument is equipped with the Digital Scaler Option, perform the following tests: a. Connect a frequency counter to pin 11 of U101 (4011 IC). The frequency should be 32.768 kHz + 0.1%. Set the digital scaler for a 0.1 minute count time. Turn the control switch to one of the four counting ranges and press the
11. Turn the instrument OFF and disconnect the probe. Make sure that the internal switches are set as follows: SW3 (alarm) ON, SW6 (dead-time compensation) ON, and SW7 (anti-saturation) ON. 12. Complete, date, and sign a Certificate of Calibration.
Surveyor M Portable Count-Rate Meter Page 20 User's Manual Appendix A (cont'd) 1064-0-U-0594
TABLE T-1 Calibration with SW6 (Dead-time Compensation) ON
Range X1000 (80%) X1000 (20%) X100 (80%) X100 (20%) X10 (80%) X10 (20%) X1 (80%) X1 (20%) Pulse Generator Output (HZ) 11,110 3,185 1,310 330 133 33.3 13.3 3.3 Actual CPM 800,000 200,000 80,000 20,000 8,000 2,000 800 200 Acceptable Meter Reading (CPM) 720,000 -880,000 180,000 -110,000 72,000 - 88,000 18,000 - 22,000 7,200 - 8,800 1,800 - 2,200 720 880 180 220
TABLE T-2 Calibration with SW6 (Dead-time Compensation) OFF
Range X1000 (80%) X1000 (20%) X100 (80%) X100 (20%) X10 (80%) X10 (20%) X1 (80%) X1 (20%) Pulse Generator Output (HZ) 13,333 3,333 1,333 333 133 33.3 13.3 3.3 Actual cpm 800,000 200,000 80,000 20,000 8,000 2,000 800 200 Acceptable Meter Reading (cpm) 720,000 -880,000 180,000 -220,000 72,000 - 88,000 18,000 - 22,000 7,200 - 8,400 1,800 - 2,200 720 880 180 220
Note: The values in the above tables may not correspond to those for other Bicron or competitive models.
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual Appendix B Spare Parts List No. 1064910 Bicron Surveyor M with Digital Scaler Option
Description Main PC Board Assembly C1, C22 Capacitor, C2, C18, C19 Capacitor, C3 Capacitor, C5, C20 Capacitor, C6, C7, C23 Capacitor, C8 Capacitor, C9, C25 Capacitor, C10, C13, C17 Capacitor, C11, C12, C21, C24 Capacitor, C14 Capacitor, C15, C16 Capacitor, D1, D2, D4-10, D13-D17, D20 Diode, D11, D12 Rectifier, Q1 Transistor, Q2 Transistor, Q3 Transistor, R1 Resistor, R2 Resistor, R3 Resistor, R4 Resistor, R5 Resistor, R6, R56, R57 Resistor, R7, R8 Resistor, R9 Resistor, R11, R12, R22 Resistor, R13, R50 Resistor, R14 Resistor, R15 Trimpot, R16, R38 Resistor, R17 Trimpot, R18, R39 Resistor, R19, R31 Trimpot, R20, R27 Resistor R21 Trimpot, R23, R34-R36, R41, R55, R58 Resistor, R24, R40, R44, R54 Resistor, R28, R46 Resistor, R29 Trimpot, R30 Resistor, Schematic Symbol 0.1 FF, 0.001 FF, 0.001 FF, 33 FF, 0.01 FF, 2.2 FF, 1.0 FF, 0.22 FF, 0.047 FF, 180 pF, 0.01 FF, 1N4148 2kV PIV 2N4124 2N5210 2N4126 10k, 200 ohms, 27k, 1.3k, 4.7k, 10k, 4.7k, 10k, 100k, 274k, 4.99 meg, 5 meg 499k 500k 100k, 50k, 4.99k 5k, 1 meg, 470k, 82.5k, 500 ohm 249 ohm, Film 3kV cer. Film 16 V tan. Film 16 V tan. 35 V tan. Film Film N750 cer. 3 kV cer. Part No. 1029010 9211041 9201022 9211021 9233362 9211031 9232251 9231051 9212241 9214731 9202011 9201032 9600004 9600001 9610001 9600005 9610002 8110022 8120002 8127024 8113012 8147012 8110024 8147014 8510024 8110034 8527434 8549941 9395051 8549934 9395041 8549924 9395031 8549914 9395021 8110044 8147034 8582524 9395011 8524904
1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w, 1/4w,
5% 5% 5% 5% 5% 5% 5% 1% 5% 1% 1%
1/4w, 1% 1/4w, 1% 1/4w, 1% 1/4w, 5% 1/4w, 5% 1/4w, 1% 1/4w, 1%
Surveyor M Portable Count-Rate Meter Page 22 User's Manual Appendix B (cont'd) Spare Parts List No. 1064910 Bicron Surveyor M with Digital Scaler Option
Schematic Symbol R32 R33 R37 R42, R43 R47, R51, R52 R48 R49 RN1 SW3, SW6, SW7 U1 U2 U3 U4, U5 U6 U7, U8 XFMR Description Resistor, Resistor, Resistor, Resistor, Resistor, Resistor, Resistor, Res. Network, Switch, Int. Ckt., Int. Ckt., Int. Ckt., Int. Ckt., Int. Ckt., Int. Ckt., Transformer, Connector, Switch PC Board Assembly Resistor, Switch, Switch, Sounder Header, 1 meg, 1/4w, 1% 11k, 1/4w, 1% 1000 meg, 1% 2.7k, 1/4w, 5% 3.3meg, 1/4w, 5% 100k 1/4w, 1% 23.7k, 1/4w, 1% 7 x 220k Slide, SPST MC3302PDS MC14538BCPDS MC14093BCPDS CA5160BEX ICL7663CPA CD4016BEX M8149 24-pin Part No. 8510044 8511024 8810071 8127014 8133044 8510034 8523724 8822031 9550001 9640002 9650004 9650001 9640001 9640003 9650002 9500001 9780001 1029020 8568104 9560003 9560001 9720001 9780002 9420001 9420002 1029140 9710002 9400026 9400011 9850002 9782001 9460004 1064140 9550008 9960018 9710002 9400056 9400011 9850002 9782001 9460004
R26 SW2, SW4 SW5
681 ohm, Rotary, Rotary, 24-pin
1/4w, 1% 2 pos. 7 pos.
Battery PC Board Subassembly (standard) Battery PC Board Subassembly (parallel-wired option) Case Top Subassembly (standard) Handle Meter Assembly Meter Window Meter Support Bracket MHV Connector Probe Clip Case Top Subassembly (with Scaler Option) Switch, Pushbutton Rubber Boot Handle Meter Assembly Meter Window Meter Support Bracket MHV Connector Probe Clip
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual
Appendix B (cont'd)
Spare Parts List No. 1064910 Bicron Surveyor M with Digital Scaler Option
Schematic Symbol Description Case Bottom Assembly Digital Scaler PC Board Assembly (required only with Digital Scaler Option) Capacitor 22pF cer. Capacitor, 33FF 16 V tan Capacitor, 0.01FF film Capacitor, 0.047FF film Diode, zener IN5231B Resistor, 10 meg 1/4w, 5% Resistor, 470k 1/4w, 5% Resistor, 100k 1/4w, 5% Resistor, 1k 1/4w, 5% Resistor, 3.3meg 1/4w, 5% Resistor, 200 ohm 1/4w, 5% Resistor, 4.7k 1/4w, 5% Switch, Slide 3-position Int. Ckt. MC14011BCPDS Int. Ckt. MC74HC4040NDS Int. Ckt. MC14093BCPDS Int. Ckt. ICM7240IPE Crystal, 32.786kHz LCD Display Miscellaneous Battery, 9V alkaline, MN1604 Potentiometer 20k Cable, Probe, MHV-MHV, 36-inch Knob, Round, w/pointer Knob, Function Knob, Round Guard, Round Knob Manual, Technical Spare Parts List Schematic Circuit Diagram QC Acceptance Procedure Part No. 1029050 9420013 9202201 9233362 9211031 9214731 9600011 8110054 8147034 8110034 8110014 8133044 8120004 8147014 9550010 9650029 9650009 9650001 9650021 9729002 9685001
C101, C102 C103 C104 C105 D102, D103 R101 R102 R103, R105 R104, R107, R108 R106 R109 R110 SW102 U101 U102, U103 U104 U105 XTAL
BT1, BT2 R45
9750001 9382031 9801001 9770001 9770003 9770004 9100034 1064900 1064910 1064920 1064930
Surveyor M Portable Count-Rate Meter Page 24 User's Manual BLANK PAGE 1064-0-U-0594
Surveyor M Portable Count-Rate Meter 1064-0-U-0594 User's Manual Appendix C The drawings listed below follow this page. 1029920 9700241 9700242 9700225 9700226 Schematic Circuit Diagram Main PCB Assembly Switch PCB Assembly Schematic Circuit Diagram Digital Scaler Option Component Location, Digital Scaler Option Page 25
Surveyor M Portable Count-Rate Meter Page 26 User's Manual BLANK PAGE 1064-0-U-0594