Ludlum Measurements 18, Manual

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Model 18 Analyzer Technical Manual
Section 4
Ludlum Measurements, Inc. Page 4-2 March 2012
HV selector switch
: A three-position switch located below the
WIN
IN
/
OUT
switch, used for the selection of any one of the desired preset
high voltage settings.
HV Adjustments
: Recessed potentiometers located under the calibration
cover, which provides a means of setting the high voltage from 400 to
2500 volts for each individual setting selected by the
HV
selector switch.
Range Calibration Adjustment
: Recessed potentiometers located under
the calibration cover. These controls allow for individual calibration of
each range multiplier.
THR
: Recessed potentiometer located under the calibration cover, which
allows the input sensitivity (threshold) to be adjusted from -2 to -60
millivolts. The threshold is normally set at the factory for -10 millivolts.
WIN
: Recessed potentiometer located under the calibration cover, which
allows the window width to be adjusted from 0 to 2.0 times the
threshold setting (input sensitivity). The window is normally set for 1.5
times the threshold.
OL (optional)
: An internal potentiometer that allows for calibration of
the optional detector overload function.