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Summary of Contents for Ludlum Measurements 3A
- Page 1 LUDLUM MODEL 3A SURVEY METER June 2020 Serial No. 336641 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 3A SURVEY METER June 2020 Serial No. 336641 and Succeeding Serial Numbers...
- Page 4 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 6: Table Of Contents
5.3 Alarm Circuit ..............................3 MAINTENANCE ..............................3 PARTS LIST ................................4 Model 3A Survey Meter ............................4 Main Circuit Board, Drawing 464 x 639 ......................4 Calibration Board, Drawing 363 x 650 ......................5 Wiring Diagram, Drawing 363 x 653 ........................ 5 DRAWINGS AND DIAGRAMS ............................ - Page 7 Model 3A Survey Meter page iii...
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Page 8: General
Model 3A Survey Meter 1. GENERAL The Model 3A Survey Meter is a portable range multiplier has its own calibration poten- radiographic survey instrument with the additional tiometer. feature of an audible and visual alarm. The alarm circuit is adjustable from a meter scale deflection of Any GM probe offered by the company will operate 0 to above full scale for each range multiple. -
Page 9: Operating Procedures
Model 3A Survey Meter F-S Toggle Switch: Provides meter response. Range Calibration Adjustments: recessed Selecting the “F” position of the toggle switch potentiometers located under the calibration cover provides 10-90% of final meter reading in 4 on the right side of the front panel. These seconds. -
Page 10: Alarm Circuit
Model 3A Survey Meter rate-plot on semi-log paper. Set the operating voltmeter for this adjustment unless an external, voltage at the flattest position of the curve near high-voltage multiplier probe is used. the knee of the curve. 5.3 Alarm Circuit ... -
Page 11: Parts List
Part No. Model 3A Survey Meter TLC372 06-6265 CD4098 06-6066 CMXT3906TRLF 05-5890 UNIT Completely Assembled ICM7555 06-6136 Model 3A Survey Meter 48-1408 TLC27M7IP 06-6248 MAX631 06-6249 Main Board, Drawing 464 X 639 CMXT3906TRLF 05-5890 U9-U11 CMXT3904TRLF 05-5888 BOARD Assembled Circuit... -
Page 12: Calibration Board, Drawing 363 X 650
Model 3A Survey Meter Ref. No. Description Part No. Ref. No. Description Part No. R177 200 OHM 10-7006 Wiring Diagram, Drawing 363 x 653 R189 301 OHM 12-7855 R196 10-7016 AUDIO R203 10-7070 R204-R205 100k 10-7023 UNIMORPH #6030 21-9251 R206... - Page 13 Model 3A Survey Meter Ref. No. Description Part No. HARNESS-PORT CAN WIRES 8363-462 PORT HANDLE (ROLLED) W/SCREWS 4363-139 PORT HANDLE FOR CLIP W/SCREWS 7363-203 REPLACEMENT CABLE (STD 1 m [39 in.]) 40-1004 CLIP (44-3 TYPE) W/SCREWS 4002-026-01 CLIP (44-7 TYPE)
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Page 14: Drawings And Diagrams
Model 3A Survey Meter DRAWINGS AND DIAGRAMS Main Circuit Board, Drawing No. 464 x 639 Main Circuit Board Component Layout, Drawing 464 x 642 (2 sheets) Calibration Board, Drawing No. 363 x 650 Calibration Board Component Layout, Drawing 363 x 651 Wiring Diagram, Drawing No.
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