Models 375 (Including Series One), 375/1, 375/2 & 375/4 Section 4
Ludlum Measurements, Inc. Page 4-5 May 2017
Model 375/4
Typical response and set points for the model 375 with internal energy-
compensated LND 71412 GM detector is as follows:
Operating Voltage: 550 Vdc
Threshold: 100 mVdc
Calibration Constant: 100 cpm/mR/hr
Dead Time Correction: 30 µsec-150 µsec
Linear Range with DTC: 1 mR/hr - 8 R/hr
Typical Checkpoints:
2 mR/hr
8 mR/hr
20 mR/hr * set calibration constant
80 mR/hr
200 mR/hr
800 mR/hr
2,000 mR/hr
8,000 mR/hr * set dead time correction
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