Model 3 Technical Manual Section 6
Ludlum Measurements, Inc. Page 6-1 April 2016
Calibration and Maintenance
Calibration
Calibration controls are located on the front of the instrument under the
calibration cover. The controls may be adjusted with a 0.32 cm (one-
eighth inch) blade screwdriver.
Note:
Local procedures may supersede the following.
The instrument may be calibrated using Exposure Rate Calibration or
CPM Calibration. Both methods are described below. Unless otherwise
specified, the instrument is calibrated to exposure rate at the factory.
Note:
Measure high voltage with a Model 500 pulser or a high-
impedance voltmeter with a high-meg probe. If one of
these instruments is not available, use a voltmeter with a
minimum of 1000 megаohm input resistance.
Calibration shall include response evaluations and adjustment for two
points of each scale of the instrument. The points should be separated by at
least 40% of the full-scale value and should be represented by points of
approximately equal distance from the mid-point of the scale. For example,
25% and 75%, or 20% and 80% could be used.
Sectio
6
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