Connecting A Detector To The Instrument; Battery Test; Instrument Test - LUDLUM MODEL 3 Technical Manual

Model 3
Ludlum Measurements, Inc.
Technical Manual
counterclockwise a quarter of a turn. Install two ˝
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 "D" size battery is positive.

Connecting a Detector to the Instrument

Caution!
The detector operating voltage 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 3 range selector switch to the
position before connecting or disconnecting the cable or
OFF
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

Check the batteries daily or prior to use, whichever is less frequent, to assure
proper operation of the instrument. Move the range multiplier switch to the
position. Ensure that the meter needle deflects to the battery check
BAT
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.

Instrument Test

After checking the batteries, turn the instrument range switch to the X100
position. Place the
detector to a check source. The instrument speaker should emit "clicks"
relative to the rate of counts detected. The ˝
the audible clicks if in the
recommended to keep the AUD ON/OFF switch in the OFF position
- switch in the
AUD ON OFF
position. In order to preserve battery life, it is
OFF
Page 2-2
Section 2
˝ size batteries in the
D
position. Expose the
ON
/ ˝ switch will silence
AUD ON OFF
April 2016