Model 15
Technical Manual
Section 2
Ludlum Measurements, Inc.
Page 2-2
June 2020
Battery Installation
Ensure the Model 15 range selector switch is in the
OFF
position. Open the
battery lid by pushing down and turning the quarter-turn thumbscrew
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, then 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 a Detector to the Instrument
Caution!
The detector operating voltage (
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 15 range selector switch to the
OFF
position before connecting or disconnecting the cable or
detector.
Connect one end of a detector cable to the desired 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.
