MODEL 2224-1
Technical Manual
Section 8
Ludlum Measurements, Inc.
Page 8-3
January 2012
SYMPTOM
Meter goes full-scale
or “pegs out”
(continued)
No Response to
Radiation
No Audio
POSSIBLE SOLUTION
3.
Open the instrument “can” and
check for loose wires.
4.
Ensure that the instrument’s “can”
is properly attached. When attached
properly, the speaker will be located
on the left side of the instrument. If
the can is on backwards, interfer-
ence between the speaker and the
input preamplifier may cause noise.
1. Substitute a “known good” detector
and/or cable.
2. Has the correct operating voltage
been set? Refer to the calibration
certificate or detector instruction
manual for correct operating
voltage. If the instrument uses
multiple detectors, confirm that the
high voltage is matched to the
current detector being used.
1. Ensure that the
VOL
(volume) knob
is turned up.
2. Remove the instrument housing and
check the connection between the
circuit board and the speaker. Plug
in the two-pin connector if
necessary.