MODEL 2224-1
Technical Manual
Section 2
Ludlum Measurements, Inc.
Page 2-2
January 2012
switches for the desired
AUDIO
division and
TONE
as described on Page 4-3.
Replace the cover and fasten the latches.
Battery Installation
Ensure that the range selector switch is in the
˝
OFF
˝
position. Open the
battery lid by pushing down and turning the quarter-turn thumbscrew
counterclockwise one-fourth 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 one-fourth 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 2224-1 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 one-fourth 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 selector switch to the
BAT
position. Verify that the overload
(
OL
) LED on the front panel turns on briefly. The LCD should go through
an initialization sequence displaying
˝
88:8.8:8.8,
˝
then the current sample
number, and finally
˝
0.
˝
Ensure that the meter needle deflects to the battery
check portion on the meter scale. If the meter does not respond, check to
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