Model 3000 Survey meter User’s Manual Section 2
Ludlum Measurements, Inc. Page 2-6 April 2021
Detector Overload
As another diagnostic test, the Model 3000 monitors the HV supply's
detector current. A current overload threshold can be set via Setup Mode.
(A setting of 0 disables this alarm.) In general, this alarm setting can be used
to detect when there is some detector failure, a cable failure, or a possible
high level of radiation. When this alarm is triggered, the LCD will display
OL and an alarm tone will sound. Once the detector current goes below the
threshold, the Model 3000 will return to normal operation.
Figure 7: Detector Overload Alarm; will also flash.
Instrument Use and Controls
With four front-panel buttons, the Ludlum Model 3000 is simple and easy
to use with minimal training required. Default operation is RATE mode,
and the display shows the current count rate using the Primary units. Long-
pressing the UNITS button will switch between Primary and Secondary
units. Long-pressing the MODE button will switch the instrument to MAX
mode, which will display the highest count rate detected. Long-pressing the
MODE button again will switch it to COUNT mode, which will display the
COUNT timer. Note that either or both of the MAX and COUNT modes
can be locked out in the setup process.
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