Davtron M880A User manual

MECHANICAL
ELECTRICAL
Full six-digit GMT clock
Universal & Local Time
Elapsed Time - Count Up / Count Down Alarm
SPECIFICATIONS
• GMT full 6 digit, hours/ minutes/ seconds
• Local Time 24 hour, 4 digit
• Four Digit Elapsed Time count up starts
minutes, seconds then hours and minutes
up to 99:59
• Elapsed Time count down settable from
one second to 59 minutes 59 seconds
• Elapsed Time Alarm activates at zero
when counting down and ashes display
• N.V.G. compatible
• Battery type AA alkaline
• Input Current 500ma
• Input Voltage 28 volts D.C.
• Weight 10 oz.
• Warranty one year
FEATURES
•Two-button control system is natural and
error-free. Setting operations are identical
for all features US Patent #4,486,077
•Control switch has remote capability
•Incandescent displays
•N.V.G. f i lter
•Manual dimming of the display
•Full 6 digit display selectable GMT/Local
•Time/Elapsed Time
•Elapsed Time is count up or down
•A 4 Megahertz crystal precision time
reference
•Keep alive battery with 2 year life
NVG DIGITAL CLOCK
M880A
BG7B GREEN A
M880A-S
NVG Compatible Display
427 HILLCREST WAY
REDWOOD CITY (EMERALD HILLS), CA 94062
[phone]
www.davtron.com
M880
2.200
1.350
3.125
TYPE AA
BATTERY
CHRONOMETER
SELECT CONTROL
GMT
LT
3.175
3.885
4-40 CS
82
° TYP
4 PL.
TYP 45
°
4 PL.
ET
DIM
G
M
T
M880A
DAVTRON
2.750
.250
HEAT
SINK
5
4
3
2
1
9
8
7
6
Remote “Control” switch 28VDC activates
28 Volts
GND

CLOCK OPERATION
Normal Operation
The SEL button selects what is to be displayed
on the four digit window and the CTL button
controls what is being displayed. Pressing
select sequentially selects GMT, Local Time,
Elapsed Time and back to GMT. The control
button starts and resets Elapsed Time when
momentarily pushed. Normal operation of the
880A cannot accidentally reset time.
Setting GMT
Select GMT for display in the four digit
window with the SEL button. Simultaneously
press both the select and control buttons to
enter the set mode. The tens of hours digit will
start ashing. The control button has full
control of the ashing digit and each button
push increments the digit. Once the tens of
hours is set, the select button selects the next
digit to be set. After the last digit has been
selected and set with the control button, a
nal push of the select button exits the mode.
The lighted annunciator will resume its
normal ashing, indicating the GMT clock is
running.
Setting LT
Select Local Time, LT, using the SEL button.
Simultaneously push the SEL and CTL buttons
to enter set mode. The tens of hours digit will
start ashing. The set operation is the same as
for GMT, except that minutes are already
synchronized with the GMT clock and cannot
be set in Local Time.
Control/Select Disable
When there is no aircraft power applied to the
clock the SEL and CTL buttons are disabled.
Elapsed Time 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 ET to zero.
Elapsed Time Count Down
Select ET for display and enter set mode by
pressing both buttons simultaneously. A
count down from any time, a maximum 59
minutes and 59 seconds, can be set. The time
is entered the same as UT setting. Once the
last digit is set, pressing the SEL button exits
the set mode and the clock is ready to start
the countdown. Pressing the CTL button now
will start the countdown. The alarm becomes
active at zero, ashes the displys, and enables
the external alarm. Pressing either button, SEL
or CTL, will reset the alarm. After reaching zero
the ET counter will count up.
Test Mode
Hold the SEL button down for three seconds
and the display will indicate 88:88 and
activate all four annunciators.
M880A DIGITAL CLOCK
Elapsed Time
Local Time
GMT Time