Chapter 2 Installation - First Use of System
14 Gem-5 User’s Manual
• This is followed by several consecutive background update cycles. Five
cycles is the default, however the number of background cycles can be
selected in the Setup − Wait Timeouts screen. The LCD display indicates
“Please Wait / Initializing Background”. During this time, if an approach
sensor is triggered, the LCD display indicates “Stay Back” and plays the
STAYBACK.WAV message at intervals until the approach sensor is no
longer triggered. If the unit is occupied then background initialization is not
performed; instead the unit displays “Please Leave” and plays the
LEAVE.WAV message at intervals until the unit is vacated.
•
At the completion of the background update, the screen will display the
screen-saver Mirion Technologies (Canberra CA) Ltd. logo (slowly
drifting). The monitor performs total self-diagnostics at the detector
and board level. Each time the monitor is rebooted all electronics,
including Detector Boards, are queried for proper operation. The
monitor then displays one of the following messages:
•
“Please Wait / Initializing Background” following boot-up indicates the
unit is fully operational. This is also true when returning a unit to service
following testing or setup.
The Setup Menu can then be accessed to set operational parameters for
release limits and the communication functions needed by the facility.
Refer to the chapter, Unit Setup on page 72, as it will provide information
on the different types of plots available for High Voltage (including
Figure of Merit Optimization) and Discrimination setup as well as
calibration requirements and methodology.
• “Out Of Service” indicates a component is missing, has failed, or is not
properly connected, or operational settings have been exceeded, e.g. high
background.
Press the Esc key on the keyboard to display the FAULT screen, which should
identify the problem.
Refer to the chapter, Diagnostics/Maintenance on page 194, as it will give help
on maintaining the unit by discussing the Test menus and how to handle Faults
by troubleshooting.
Where applicable (e.g. not possible with any detector in a GEM-5 except for
the bottom detector since it is the only one which is easily accessible), visually
check the Detector Board for randomly flashing LEDs, which indicate that the
board and detector is functioning. This verifies that the +12 VDC is being
properly supplied through the serial bus from the low-voltage power supply in
the computer box.
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