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M O D E L 8 1 1 C O P E R AT I O N
Davtron model 811C has an internal lithium battery before it leaves the factory.
All three functions of the clock are activated and working. At this time, Davtron
sets the clock function to accurate time of GMT. The Clock, the Flight time and
the elapse time will work approximately 5 years without any additional power.
No aircraft keep-alive voltage necessary. Aircraft power is required to light the
display only.
DISPLAY SELECT
The switch marked Time/F.T./E.T. is a
three position switch that selects the
function to be displayed. All three
functions operate normally no matter
what function has been selected for
display.
TIME
When the time function is selected,
the proper time will read in hours,
minutes, and seconds. The time chan-
nel may be set to local time or G.M.T.
time.
FLIGHT TIME RECORDER
When the Flight Time channel is
selected, the actual time in flight will
be displayed in hours, minutes, and
seconds. The Flight Time channel is
controlled by applying a voltage to the
Blue Control Lead of the clock. This is
recommended to be operated from an
air switch. When the aircraft starts its
take-off run and the airswitch closes,
the Flight Time recorder will start to
run, recording Flight Time. Anytime
during flight the pilot may check total
time in flight. When the aircraft has
landed, the pilot can record total Flight
´
Time. The pilot can have total flight
time on a trip with a number of stops
if he avoids returning the Flight Time
recorder to zero. The Flight Time
recorder will total time up to 24 hours.
Normally it is recommended that the
Flight Time recorder be zeroed on the
pre start up check list of the aircraft.
ELAPSED TIME METER
When the Elapsed Time channel is
selected the Elapsed Time meter
wi l l r ea d i n h o u rs, mi nu t e s, a n d
seconds. This recorder is fully con-
trolled by the pilot from the front
panel. It may be started, stopped,
and returned to zero for elapsed
time, approach, time, etc. It contin-
ues to operate when aircraft power is
off. Totals time up to 24 hours.
DIM POSITION FOR DISPLAY
For night operation a Dim position is
provided. Normal position is B or
bright.
SETTING TO ACCURATE TIME
Davtron sets the clock to the correct
GMT time when it leaves the factory.
To change hour, push Dim/Bright
switch to 1hr up position. Each
press or just holding it in the 1hr up
position will increase time by one
hour. This setting does not effect the
minutes or seconds.
The switch marked Set is for chang-
ing minutes or seconds. When you
hold set switch in UP mode, minutes
will count one per second until 5 sec-
onds elapse, then minutes speed up
to 5 minutes per second. When you
hold set switch in the D, down posi-
tion, the seconds reset to zero.
During the time the clock is being set
up or down, the Elapsed Time and
Flight Time still continue to operate
normally. The Set switch is a momen-
tary switch and automatically returns
to the center position.
CHANGING CLOCK FROM
24 TO 12 HR
´
With unit off, hold Bright/Dim switch
in 1hr up position, turn on unit. Unit is
now 12HR. Repeat steps to switch
back.
TIME FUNCTION
ELAPSED TIME
This switch makes minor time corrections
Position #1 (up) is a momentary position
and sets the clock one minute forward for every
second held in the up position. After 5 seconds,
minutes speed up to 5 per second.
Position #2 is the normal position.
Position #3 (D) is a momentary position and
resets seconds to zero when selected or held.
This switch selects which
channel is to be displayed
Position #1 (Time) selects real time. This
channel may be set to G.M.T. time or local time.
Reads in hours, minutes and seconds.
Position #2 (F.T.) selects Flight Time, reads
in hours, minutes and seconds of actual flight.
Position #3 (E.T.) selects Elapsed Time,
reads in hours, minutes and seconds.
↑
FLIGHT TIME
This switch sets Bright/Dim, and makes one
hour changes
Position #1 (B) is the Bright position of the
display for daytime use.
Position #2 (Dim) is for night time use.
Position #3 (1 hr. up) is a momentary position
and sets the clock 1 hour ahead for every time the
switch is moved to this position and released.
This switch controls the
Elapsed Time meter
Position #1 (Zero) is a momentary position
and sets the Elapsed Time meter to zero. The
switch returns to position #2 when released.
NOTE: Position #1 will zero Flight Time only if
power to the clock is off. (Standard Setting)
Position #2 (Stop) will stop the Elapsed Time meter.
Position #3 (Run) starts the Elapsed Time meter.
↑
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