Model 3001 Multi-Detector Survey Meter
User’s Manual
Section 2
Ludlum Measurements, Inc.
Page 2-6 April 2014
Detector Overload
As another diagnostic test, the Model 3001 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 3001 will return to normal operation.
Figure 7: Detector Overload Alarm; will also flash.
Instrument Use and Controls
With four front-panel buttons (as seen in front-panel drawing in front of
manual), the Ludlum Model 3001 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.
ON/ACK button
: Used to power the Model 3001 ON and OFF, reset MAX
mode, start/reset the COUNT Timer, and acknowledge audio alarms.
Power On: Press for approximately one second and release (all
LCD segments will activate, and firmware version will be shown).
Power Off: Press and hold for approximately four seconds. The
display will show a 3, 2, 1 countdown for the final three seconds of
shutdown. Releasing the ON/ACK button during shutdown will
return the device to the previous state of operation. At completion
of the shutdown count, the LCD will go blank.