Model 2200 Scaler Ratemeter
Ludlum Measurements, Inc. Page 4 March 2016
Description of
Controls and Functions
Front Panel
COUNT LAMP: a red LED, indicating that the scaler is in the count cycle.
COUNT SWITCH: resets and starts the scaler counting. The scaler turns off at the end
of the preset time.
COUNT TIME: Time base is normally in minutes from 0-999 with multiples of X0.1
and X1. It may be changed to seconds by an internal dipswitch.
MINUTES: a three-decade thumbwheel switch used for presetting count time.
Ratemeter Function Selector: a three-position switch labeled RATE, HV, and BAT.
The function of this switch is to allow the operator to have ratemeter readout on the
meter, HV readout on the meter, or battery check status on the meter.
THRESHOLD: A 10-turn potentiometer is used to set the basic pulse discrimination
point of the scaler. This control is linear in the range of 1.00 through 10.00. If set below
1.00, in addition to non-linearities, the system noise can cause errors.
WINDOW: a 10-turn potentiometer used for adjusting the window width. It is
calibrated with the THRESHOLD control so that one turn of the window control is
equivalent to one turn of the THRESHOLD control.
WINDOW ON-OFF: a toggle switch allowing insertion (ON) or removal (OFF) of the
window.
Detector Input Connection: a series “C” coaxial connector; other connectors are
available upon request.
DISCR: a one-turn potentiometer for setting the range of the threshold potentiometer.
It is a non-indicating control, allowing a wide selection of operating points without
exceeding the linear ranges of the threshold/window circuits or detector voltage rating.
Maximum amplifier sensitivity occurs at maximum clockwise setting.
RANGE Selector Switch: a four-position switch providing range multipliers of X1,
X10, and X1K. With a scale of 0-500 cpm, the full range of the instrument is 0-500,00
cpm.
Sectio
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