Model 14C Survey Meter
Ludlum Measurements, Inc. Page 15 July 2022
nonlinear readings (continued)
meter goes full-scale or “pegs out”
no response to radiation
no audio
POSSIBLE SOLUTION
3. Check for “sticky” meter movement. Does
the reading change when you change the
meter? Does the meter needle “stick” at any
spot?
4. Check the “meter zero.” Turn the power
OFF. The meter should come to rest on
zero.
1. Replace the detector cable to determine
whether or not the cable has failed, causing
excessive noise.
2. Check the HV, and if possible, the input
threshold for proper setting.
3. 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,
interference 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 AUD ON-OFF switch is in
the ON position.
2. Remove the instrument housing and check
the connection between the circuit board and
the speaker. Plug in the 2-pin connector if
necessary.
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