ELECTRONIC PERSONAL DOSEMETER HANDBOOK
EPD/HB/40521/000
OPERATING INSTRUCTIONS
ISSUE 5
Thermo
Page 33
To perform the EPD confidence test, press and hold the button until this
top-level display appears:
Only one sub-display is available:
♦
Test
This test can be run at any time during operational use as a confidence check that
the EPD is functioning correctly. Throughout the confidence test the heart-beat
(activity) indicator flashes once per second. The confidence test can be stopped
at any time by pressing the button.
Note: During the EPD confidence test a brief detector test is performed, during
which dose accumulation is momentarily inhibited (1 to 2 ms
approximately).
Double-press the button. The EPD will commence its confidence test routine, as
follows:
1. The all-segment display is displayed for approximately 5 seconds. This
allows the user to check that all segments are functional (see Figure 3.2).
2. The alarm will sound and the LED will flash for approximately 2 seconds.
This indicates that the sounder and LED are functional.
3. The all-segment display will disappear. The alarm will continue to sound
and the LED will continue to flash, at an increased rate, for approximately 6
seconds. This indicates that the LCD segments can be turned off, and that
the tone frequencies are functional.
4. The all-segment display will reappear for approximately 5 seconds and the
LED will slow flash.
5. The all-segment display will disappear and the default display will appear.
This indicates that the confidence test has been successfully completed
and that the EPD is ready for operational use.
Upon completion of the confidence test, the unit reverts to the default display. If
the confidence test is unsuccessful a letter ‘F’ followed by three digits is displayed.
Note the failure codes and refer to Section 5 (Failure Modes and Fault Diagnosis).
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