Model 12-4 Technical Manual Section 2
Ludlum Measurements, Inc. Page 2-2 May 2016
counterclockwise a quarter of a turn. Install two ˝
D
˝ size batteries in the
compartment.
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:
The center post of a flashlight battery is positive. The batteries
are placed in the battery compartment in opposite directions.
Connecting the Detector to the Instrument
Caution!
The detector operating voltage (also referred to as HV) is
supplied to the detector via the detector input connector. A
mild electric shock may occur if you make contact with the
center pin of the input connector. Switch the Model 12-4
range selector switch to the
OFF
position before connecting or
disconnecting the cable or detector.
Connect one end of a detector cable to the detector by firmly pushing the
connectors together while twisting clockwise a quarter of a turn. Repeat the
process in the same manner with the other end of the cable and the
instrument.
Battery Test
The batteries should be checked each time the instrument is turned on.
Move the range switch to the
BAT
position. Ensure that the meter needle
deflects to the battery check portion on the meter scale. If the meter does
not respond, check to see if the batteries have been correctly installed.
Replace the batteries if necessary.
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