Models 375 (Including Series One), 375/1, 375/2 & 375/4 Section 2
Ludlum Measurements, Inc. Page 2-2 May 2017
If the RS-232 feature is used, plug in a suitably wired 9-pin
connector cable. (See Page 4-4 for the pin assignment of the 9-pin
connector.) Turn power ON with the left side panel switch. Do
not turn power OFF unless the unit is to be removed from service.
Read and then remove the sticker (illustrated to the left) from the
instrument calibration cover. Checking and setting of the alarm
point(s) is discussed in detail below and on pages 2-3 and 7-1 of
this manual.
Initial power-up will momentarily activate the internal front-panel lights,
sound the audio, and display "8888" on the 4-digit LED display. The
firmware version number (396Nyy) is then displayed as "396" and "xxyy"
(where xx and yy represents the current version number).
When the instrument has finished measuring background, it will display the
current radiation reading and begin checking for an alarm condition.
Radiation Units
The Model 375 may be calibrated for almost any desired radiation units of
measure. Common units of measure include mR/hr, µR/hr, R/hr, mSv/h,
µSv/h, cps, cpm, and kcpm. In each case, the unit of measure is indicated
underneath the four-digit display. Throughout the rest of this manual, the
notation <units> will be used as a substitute.
Checking Parameters
Check the low alarm point setting by pressing the LOW ALARM button. The
low alarm point will be displayed as long as the button is pressed. The low
alarm point is in units of <units>. The low alarm point can be set from 0.1
<units> to 9999 <units>*.
Check the high alarm point setting by pressing the HIGH ALARM button. The
high alarm point will be displayed as long as the button is pressed. The
highalarm point is in units of <units>. The high alarm point can be set from
0.1 <units> to 9999 <units>*.
Check the calibration constant by pressing the
CAL CONST button. The
calibration constant will be displayed as long as the button is pressed. The
calibration constant is in units of cpm (counts per minute) per <units>*.
The calibration constant can be set from 0.1 cpm/<units> to 9999
cpm/<units>*.
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