Front-Panel Controls - LUDLUM MODEL 2241-2 Technical Manual

Model 2241-2
Ludlum Measurements, Inc.
Technical Manual
mode when the six-digit display (four digits display and two overflow digits
in right corner) reaches 999999 and starts to roll over again.
OVERLOAD : indicates that the detector is being exposed to radiation
intensities greater than the detector maximum operating limit. For alpha
and/or beta type scintillation detectors, an
detector face has been punctured allowing external light to saturate the
photomultiplier tube inside the detector. The overload alarm point is set by
adjusting the
OVL
Low-battery icon
minimum operating voltage of 2.2 ±0.1 Vdc. Instrument will continue to
operate for approximately 24 hours thereafter.
COUNTING : Indicates that the scaler
that the scaler is accumulating counts for the pre-determined count time.

Front-Panel Controls

DET1/DET2 (Detector Select) Switch
used to select between
pulled up and then over to the desired selection.
OFF/RATEMETER/SCALER Switch
applies power to the instrument and selects
counting mode
AUD ON/OFF Switch
enabled via this front-panel toggle switch. The audible alarm is independent
of the /
AUD ON OFF
An audible alarm can only be silenced by depressing the
F/S (Fast/Slow) Response Switch
fast or slow counting response time
control located underneath the calibration cover.
: indicates that the batteries have decreased to the
COUNT
: a protected (locking) toggle switch
1 and
DET DET
: a three-position rotary switch that
: The clicks-per-event audio may be silenced or
switch and will override the audible clicks-per-event.
: a two-position toggle switch that selects
Page 4-2
may indicate that the
OVERLOAD
switch has been depressed and
2 parameters. The switch can be
RATEMETER
button.
RESET
January 2016
Section 4
or
SCALER