TM 1-1510-262-10
(5) Elapsed Time Mode (ET). (Count Up) Select ET for display. Pressing the CTL button will start ET
counting. Elapsed Time counts up to 59 minutes, 59 seconds, and then switches to hours and minutes. It continues
counting up to 99 hours and 59 minutes. Pressing the CTL button again resets to zero. (Count Down) Select ET
for display and enter by pressing both buttons. The countdown timer can now be set. Entering the time is identical
to GMT time setting. When the time is entered and the last digit is no longer lashing, the clock is ready to start the
countdown. Momentarily pressing the CTL button starts the countdown. When the count reaches zero the display
lashes and the external alarm is activated. Pressing either SEL or CTL will deactivate the alarm. ET continues
counting up until the CTL button is pressed.
(6) Test Mode. Hold the SEL button for three seconds and the display will indicate 88:88 and activate all
four annunciators.
Figure 2-43. Chronometer
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