Model 3000 Survey meter User’s Manual Section 2
Ludlum Measurements, Inc. Page 2-5 April 2021
Detector Failure Diagnostic
Note that the Model 3000 has its own diagnostic tests to ensure that the
detector is functioning correctly. The Model 3000 can detect when the
radiation detector is malfunctioning and will flash the display to indicate a
fault. If the detector stops detecting radiation for a settable number of
seconds, the Model 3000 will flash a zero reading for the currently selected
units. This indication is common if the unit is powered up without a
detector connected. If this indication is observed with a connected detector,
remove the unit from service and have it evaluated by a qualified repair and
calibration technician.
Figure 5: Detector Failure display (shown for cpm); will also flash.
Detector Over Range
If the detector is exposed to high levels of radiation or has an internal
malfunction that causes it to count high or excessively, the unit flashes the
maximum rate (999) for the currently selected units as a warning. The user
should ensure whether this is being caused by a high radiation field or by
internal malfunction. With some detectors, this display could be an indicator
of a light leak, possibly caused by a puncture or tear in the detector face. If a
Maximum Display parameter is set, then it is possible for the display to flash
the Maximum Display value under this condition.
Figure 6: Detector Over Range (shown for cpm); will also flash.
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