Operational Check - LUDLUM MODEL 19 Manual

Model 19 MICRO R METER
Ludlum Measurements, Inc.
Technical Manual
Note the (+) and (-) marks inside the battery door. Match the battery
polarity to these marks. Close the battery box lid, push down and turn the
quarter-turn thumb screw clockwise a quarter of a turn.
Note:
Center post of a flashlight battery is positive. The batteries are
placed in the battery compartment in opposite directions.

Operational Check

Turn the range selector switch to the "25" position. Depress the "
pushbutton switch and ensure that the meter needle falls within the "
" marks. Check for a proper background reading. A typical reading would
OK
be: 5-15 uR/hr
Turn the range selector switch to the "5000" position. Expose the
instrument to a check source and verify that the instrument indicates within
20% of the check source reading obtained during the last calibration.
Switch the " /
AUD ON OFF
external unimorph speaker produces an audible click for each event
detected. The "
AUD ON
" " position. It is recommended that the "
OFF
in the " " position when not needed in order to preserve battery life.
OFF
Turn the range selector switch to the "250" position and increase the source
activity for a meter reading of 10-100 uR/hr. While observing the meter
fluctuations, select between the fast and slow response time (
to observe variations in the display. The "
approximately five times slower than the "
Note:
The slow response position is normally used when the
instrument is displaying low numbers, which require a
more stable meter movement. The fast response position is
used at high rate levels.
Check the meter reset function by depressing
needle drops to "0."
Page 2-2
" switch to the " " position and confirm that the
ON
/ " switch will silence the audible clicks if in the
OFF
AUD ON
" position.
F
RESET
Section 2
/ " switch be kept
OFF
/ ) positions
F S
" position should respond
S
and ensuring the meter
February 2012
"
BAT
BAT