Model 14C Survey Meter
Ludlum Measurements, Inc. Page 6 July 2022
In the following picture, the needle is on the first tick mark past the 4 kcpm mark. Therefore, if the
instrument selector switch is on the ×0.1 range, the reading is 4.2 kcpm (multiplied by) ×0.1 = 420
cpm.
The same needle indication on successive ranges would be:
×1 = 4.2 kcpm (or 4200 cpm)
×10 = 42 kcpm (or 42,000 cpm)
×100 = 420 kcpm (or 420,000 cpm)
If you use the mR/hr scales, then the readings would be:
×0.1 = 0.13 mR/hr
×1 = 1.3 mR/hr
×10 = 13 mR/hr
×100 = 180 mR/hr*
×1000 = 1.3 R/hr (using internal detector)
Note:
*This reading is using the bottom (non-linear) scale.
Many different dials are available, but each can be used as described above.
OPERATIONAL CHECK
To assure proper operation of the instrument and detector(s) between calibrations, an instrument
operational check including battery test and instrument test (as described on Page 4) should be
performed at least daily or prior to use, whichever is less frequent. A reference reading (or readings)
with a check source should be obtained at the time of calibration
If at any time the instrument fails to read within 20% of the reference reading when using the same
check source, it should be sent to a calibration facility for recalibration and/or repair.
If desired, multiple readings may be taken at different distances and/or with different sources so
that other ranges or scales are checked.
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