2.5. INSTRUMENT USE AND CONTROLS
15
Figure 2.6: Detector Over Range-Alpha (Display Will Flash)
2.4.3 Detector Overload
As another diagnostic test, the Model 3002 monitors the HV supply’s detector current. A
current overload threshold can be set via Setup Mode or Lumic Software. (A setting of 0 or
999 disables this alarm.) In general, this alarm setting can be used to detect when there is
some detector failure, a light leak, 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 3002
will return to normal operation.
Figure 2.7: Detector Overload Alarm (Display Will Flash)
2.5 Instrument Use And Controls
With four front-panel buttons and one handle button (as seen in front-panel drawing in front
of manual), the Ludlum Model 3002 is simple and easy to use with minimal training required.
Default operation is RATE mode, and the display shows the current count rate. Pressing the
α
−
β
button will switch between alpha and beta and alpha+beta rate units. Pressing the
MODE button will switch the instrument to MAX mode, which will display the highest count
rate detected. 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. Each button may be pressed and held for a predetermined
length of time, signified by instrument beeps, to access unique instrument features. As the
button is pressed, the instrument will beep to indicate the user has reached a new level of
button access.
• A short press and release, less than 1/2 second and before any instrument beeps occur,
will activate the first level of button operation. When the button is released, a single
beep will occur as an acknowledgement.
December 2021
