MODEL 2224-1
Technical Manual
Section 4
Ludlum Measurements, Inc.
Page 4-1
January 2012
Description of Controls and
Functions
Operator Controls
OFF/BAT/X1000/X100/X10/X1 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
or
BAT
TEST
line. Moving the range selector switch to one of the range multiplier
positions (×1, ×10, ×100, ×1000) provides the operator with an overall
range of 0-500 kcpm. Multiply the scale reading by the multiplier to
determining the actual reading.
During the initial turn-on, the meter is driven full-scale for about two
seconds and then returns to zero. The LCD will then show
“
888888,
”
display the processor program version, and then
“
0
.”
Liquid Crystal Display (LCD)
: six-digit display that shows the scaler count
for the selected channel. The display also indicates when a count is in
progress by displaying two colons. The colons are turned off when the
count is completed. If the counter exceeds 999999, an arrow in the upper
left corner of the display turns on to indicate the overflow, and the
counter rolls over to zero and continues counting.
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, to
reduce battery drain.
α / α+β / β Switch
: a three-position toggle switch used to select the sum
of both alpha and beta count channels (α+β), alpha count only (α), or
beta count only (β)
for display. This switch affects both the ratemeter
and the counter. The separate ratemeter and counter channels are active
Section
4