Ludlum Measurements 2241-3, Manual

Page: 13 / 77

Model 2241-3 & 3i Technical Manual
Section 2
Ludlum Measurements, Inc. Page 2-4 January 2016
approximately five times slower than the
F
position (for fixed response
mode) and three times slower when in variable response mode. The slow
response position is normally used when the Model 2241-3 is displaying low
numbers, which require a more stable display. The fast response position is
used at high count levels.
Place the
SCA
/
RATE
switch to the
SCA
position. Depress the
COUNT
switch
located in the end of the carrying handle in order to initiate a count cycle.
The word “
COUNTING
” should be flashing on the LCD during the count
cycle and should disappear at the end of the predetermined count time. If a
scaler
ALARM
condition occurs, the
RESET
switch can be depressed to
acknowledge the alarm; however, the
COUNT
switch must be depressed to
clear the visual
ALARM
and to restart the count cycle.
Depress and release the
LIGHT
switch. The backlight located behind the
LCD should illuminate (for pre-programmed
ON
time). Select the desired
F
/
S
,
AUD ON
/
OFF
, and
RATE
/
SCA
parameters and proceed to use the
instrument.