Manual Number 9018205 Revision F, April 1, 2021
21
Timer Mode
When in Flight Timer mode, pressing the Mode button once changes the unit to Timer mode
and the TIMER annunciation will be backlit (refer to Figure 4.11). The timer function can be
operated as either an elapsed timer (stopwatch) or countdown timer, where a specific
countdown time can be set. Upon power up, the CH93 remembers countdown timer setting
and will default to the last displayed mode (elapsed or countdown). Once in Timer mode,
pressing and holding the Mode button will allow the selection of elapsed or countdown mode.
Note: When either timer is active, the user can change modes (e.g. to Local Time) and the
timer will still remain active. The timer stops and resets if power is cycled or if the timer mode
(elapsed vs. countdown) is changed.
4.5.4.1
Elapsed Timer
When entering Timer mode, the unit is in Elapsed Timer mode if the display shows
00:00:00 or the unit is counting up (and not blinking). The elapsed timer counts up to a
maximum of 99 hours, 59 minutes, 59 seconds and then starts again at zero.
Pressing the
+
button starts and stops the timer. Pressing the
–
button resets the timer
only if the timer is stopped. Refer to Figure 4.12 for detailed instructions.
4.5.4.2
Countdown Timer
Once the countdown mode is selected, the unit immediately allows the setting of the
specific countdown time. The countdown timer can be set to a maximum of 99 hours, 59
minutes, 59 seconds. Pressing the
+
button will start and stop the timer. When the
countdown timer reaches 00:00:00, it will enable the external alarm (ground output on
pin 5; Type 2 units only) and it will begin counting up and will flash every second to
indicate elapsed time since reaching zero. Pressing the
–
button resets the timer only if
the timer is stopped and it will also reset the external alarm. The countdown timer setting
is maintained when the unit is powered off. Refer to Figure 4.12 for detailed instructions.
Figure 4.11
Timer Mode (-5 unit shown)
