EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 24
3.4 LCD Display Lock-on Facility
Any new display selected using the button remains visible for a set period of time,
(Thermo Electron default time-out is 10 seconds), before returning to the default
display. Some display selections (marked * in Figure 3.4) can be ‘locked-on’, i.e. the
return to the default display is suspended. This facility is especially useful when
displaying dose-rate or when using the count down alarm. If a lock-on facility is
available it must be accepted quickly - when a colon (:) appears just before the
selected display times-out. The colon will only appear for approximately two
seconds. To accept the lock-on facility, press the button when the colon appears. If
the lock-on facility is not required, allow the selected display to time-out. To deselect
the lock-on facility press the button. The display will move on to the next display
selection but will thereafter revert to the default display after time-out.
The seconds count-down timer lock-on facility operates in a slightly different manner
to that described above. In this instance the lock-on facility is available when the
colon disappears. This only occurs for the count-down timer display and, again, is
just before the display times out. To accept the lock-on facility, press the button when
the colon disappears. If the lock-on facility is not required, allow the selected display
to time-out.
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