Model 12-4 Technical Manual Section 2
Ludlum Measurements, Inc. Page 2-3 May 2016
Instrument Test
After checking the batteries, turn the instrument range switch to the ×1000
position. Place the AUD ON-OFF switch in the ON position. The instrument
speaker should emit ˝clicks˝ relative to the rate of counts detected. The AUD
ON
/OFF switch will silence the audible clicks if in the OFF position.
It is recommended that the AUD ON/OFF switch be kept in the OFF position
when not needed in order to preserve battery life.
Rotate the range switch through the lower scales until a meter reading is
indicated. While observing the meter fluctuations, select between the fast
and slow response time (F/S) positions to observe variations in the display.
The ˝S˝ position should respond approximately 5 times slower than the ˝F˝
position.
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 the RES pushbutton switch
and ensuring the meter needle drops to “0.”
Once this procedure has been completed, the instrument is ready for use.
Operational Check
To assure proper operation of the instrument – between calibrations and
periods of nonuse – an instrument operational check, including battery test
and instrument test (as described above), should be performed prior to use.
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