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Model 3-IS & 3-IS-1 Technical Manual
Section 2
Ludlum Measurements, Inc. Page 2-7 October 2010
The same needle indication on successive ranges would be:
×1 = 4.2kcpm (or 4,200 cpm)
×10 = 42kcpm (or 42,000 cpm)
×100 = 420kcpm (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*
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 operation of the instrument and detector(s) between calibrations, an
instrument operational check including battery test and instrument test (as
described above) 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 with the detector(s) in a constant and reproducible manner at the
time of calibration or at the time the instrument is received in the field.
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.