Model 2363
Technical Manual
Section 6
Ludlum Measurements, Inc.
Page 6-1
January 2015
Calibration and Maintenance
Calibration
Note:
Local procedures may supersede the following.
Meter Calibration
A Ludlum Model 500 Pulser or equivalent is required. If the pulser does not
have high-voltage readout, use a-high impedance voltmeter with at least 1000
megohm input resistance to measure the detector voltage.
Ensure that the meter movement has proper mechanical zero. The
adjustment is on the front of the meter bezel. It must be adjusted to
˝
0
˝
with
the
ON
/
OFF
selector switch in the
OFF
position.
Connect the Model 500 Pulser to the Model 2363 with the appropriate cable.
Rotate the Model 2363 range selector switch to the ×100 position. Select the
˝
N
˝
channel position.
Adjust the pulser for 400 cpm and the pulse amplitude to -20 mV. Connect
the instrument to a computer using a straight-thru 9-pin cable. Using the
Ludlum Model 2363 interface software, adjust
˝
SE10001
˝
for 1 cpm per
mrem/hr.
Remove the instrument cover and adjust the
MTR
potentiometer until the
meter reads 400 cpm. Adjust the pulser to 100 cpm and ensure the rate meter
reads 100
10%. Decade the pulser and the Model 2363 range selector switch
to check meter linearity on the ×10, ×1, and ×0.1 positions. Linearity should
be within
10% of each reading.
Adjust the
NHV
and
NTHR
controls for the appropriate set points as described
in the following subsection, “Establishing an Operating Point.”
Section
6
