Related Manuals for Ludlum Measurements 3-98
Summary of Contents for Ludlum Measurements 3-98
- Page 1 LUDLUM MODEL 3-98 SURVEY METER June 2020 Serial No. 346285 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 3-98 SURVEY METER June 2020 Serial No. 346285 and Succeeding Serial Numbers...
- Page 3 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
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Page 5: Table Of Contents
M3-97 Survey Meter TABLE OF CONTENTS 1.GENERAL ..................................1 2.SPECIFICATIONS ................................1 3.DESCRIPTION OF CONTROLS AND FUNCTIONS ....................2 4.OPERATING PROCEDURES ............................3 5.CALIBRATION ................................4 5.1 Detector Operating Point ............................4 5.2 Calibrating CPM Meter Dial ..........................4 6.MAINTENANCE ................................5 7.THEORY OF OPERATION ............................ -
Page 6: General
Model 3-98 Survey Meter June 2020 1. GENERAL The Model 3-98 is a portable survey instrument Each range multiplier has its own calibration with four linear ranges up to 500,000 cpm. The potentiometer. instrument features an internal pancake tube along with the capability of utilizing an... -
Page 7: Description Of Controls And Functions
Model 3-98 Survey Meter June 2020 3. DESCRIPTION OF CONTROLS AND FUNCTIONS Range Multiplier Selector Switch: a seconds. In the "F" position, there is a six-position switch marked OFF, BAT, fast response and large meter deviation. X100, X10, X1, X0.1. -
Page 8: Operating Procedures
Turn the INT/EXT switch to EXT. for confirming correct operation. Confirm the proper reading on each scale. Connect a detector to the Model 3-98. If the instrument does not read within 20% of the proper reading, it should be sent in to a calibration facility for recalibration. -
Page 9: Calibration
Model 3-98 Survey Meter June 2020 5. CALIBRATION 5.1 Detector Operating Point 5.2 Calibration CPM Meter Dial To calibrate the cpm scale, a Ludlum Model CAUTION: The detector operating voltage is 500 pulse generator is required. connected to both detectors at all times, ... -
Page 10: Maintenance
Model 3-98 Survey Meter June 2020 6. MAINTENANCE Instrument maintenance consists of keeping the The batteries should be removed and the instrument clean and periodically checking the battery contacts cleaned of any corrosion at batteries and the calibration. least every three months. If the instrument has... -
Page 11: Theory Of Operation
Model 3-98 Survey Meter June 2020 7. THEORY OF OPERATION 7.1 Input Positive pulses from Pin 7 of U4 are The external detector pulses are coupled coupled to the discriminator. from the detector through C3 to emitter follower Q5. R10 and R20 provide bias. -
Page 12: Meter Drive
Model 3-98 Survey Meter June 2020 7.7 Meter Drive 7.11 Low Voltage Reference The meter is driven by the emitter to Q3, U7 provides a 1.22 V precision reference coupled voltage follower for HV supply. conjunction with Pin 1 of U3. For the battery test, the voltage follower is 7.12 High Voltage Supply... -
Page 13: Parts List
Model 3-98 Survey Meter June 2020 PARTS LIST Ref. No. Description Part No. Ref. No. Description Part No. TLC372IP 06-6265 Model 3-98 Survey Meter CD4098BE 06-6066 LM385Z-1.2 05-5808 UNIT Completely Assembled Model MAX631 06-6249 3-98 Survey Meter 48-1135 CMXT3904TRLF 05-5888... -
Page 14: Calibration Board, Drawing 363 X 528
2001-066 100k Trimmer 09-6813 PORT BEZEL FRONT PANEL ASSY 4363-188 RESISTOR NETWORK PORT DEEP CAN ASSEMBLY 4363-615 NETWORK-10k SIP MODEL 3-98 CAN ASSY 4363-737 8PIN 12-7720 Model 3-98 CASTING 9363-739 Model 3-97/3-98 MAIN MISCELLANEOUS HARNESS 8363-700 PORTABLE KNOB 08-6613 CONN-640456-5... - Page 15 Model 3-98 Survey Meter June 2020 Ref. No. Description Part No. PROBE KNOB- MS 91528 08-6606 PORT BEZEL GLASS W/O SCREWS 4363-352 METER MOVEMENT (1mA) 15-8030 PORTABLE METER FACE 7363-136 HARNESS-PORT CAN WIRES 8363-462 PORTABLE BATTERY LID WITH STAINLESS CONTACT 2009-036 PORT.
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Page 16: Drawings And Diagrams
Model 3-98 Survey Meter June 2020 DRAWINGS AND DIAGRAMS Main Circuit Board, Drawing 464 x 633 Main Circuit Board Component Layout, Drawing 464 x 636 (2 sheets) Calibration Board, Drawing 363 x 528 Calibration Board Component Layout, 363 x 529 (2 sheets)
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