Ludlum Measurements 25009185, Manual

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2.5. DETECTOR FAILURE DIAGNOSTICS 15
Figure 2.5: Detector Loss of Count Display (Display Will Flash)
2.5.2 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 display value for the
currently selected units as a warning. Additionally, the ALARM icon is displayed at the top
of the screen, an audio alarm sounds (which can be silenced by a long press of the ON/ACK
button ), and the device status OVERRANGE is streamedor logged. The user should ensure
whether this condition is being caused by a high radiation field, by a shorted cable, or by in-
ternal malfunction. If a Maximum Display parameter is set, then it is possible for the display
to flash the Maximum Display value under this condition.
Figure 2.6: Detector Over Range (Display Will Flash)
2.5.3 Detector Overload
As another diagnostic test, the Model 3001 monitors the HV supply’s detector current. A cur-
rent overload threshold can be set via Setup Mode or Lumic Software. (A setting of 0 disables
this alarm.) In general, this alarm setting can be used to detect when there is some detec-
tor failure, a cable failure, or a possible high level of radiation. When this alarm is triggered,
the LCD will display "OL" in place of the numerical values, and an alarm tone will sound.
Once the detector current goes below the threshold, the Model 3001 will return to normal
operation.
December 2021