Model 2363
Technical Manual
Section 4
Ludlum Measurements, Inc.
Page 4-1
January 2015
Description of Controls and
Functions
Operator Controls
OFF/BAT/X100/X10/X1/X0.1 Switch
(or Range Selector Switch): a six-
position rotary switch to select the analog meter range multipliers and
check the battery status. When switched to the
˝
BAT
˝
position, the meter
pointer should deflect above the left vertical mark on the
˝
BAT OK
˝
line.
Moving the range selector switch to one of the range multiplier positions
(×0.1, ×1, ×10, ×100) provides the operator with an overall range of 0-
1000 mrem/hr. Multiply the scale reading by the multiplier to
determining the actual reading.
During initial instrument turn-on, the meter will be driven full scale for
about two seconds and then return to 0. The LCD will show “88:8.8:8.8,”
display the current sample number, and then
˝
0
˝
. If the count button is
pressed while the display is showing all 8s, then the following numbers
are shown: firmware number, date, time, neutron rate meter alarm,
gamma rate meter alarm, n gamma rate meter alarm, integrated
dose alarm, current sample number, and then
˝
0
˝
.
Liquid Crystal Display (LCD)
: six-digit display that displays the count rate
for the selected channel
VOL
: Turning this control clockwise will increase the speaker volume and
counterclockwise will decrease the volume.
Note:
The volume should be turned down when not required, in order
to reduce battery drain.
N/N+G/G Switch
: a three-position toggle switch used to select the sum of
neutron and gamma count channels (
N
+
G
), neutron count only (
N
), or
gamma count only (
G
), for display. This switch affects both the analog
Section
4
