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D-16 / Feb 2003
OPERATION
Setting the Time
The setting controls consist of two switches: MODE and SET. To set
the clock, open the meterbridge cover:
1) The control switches (mounted on the bottom part of clock PCB
assembly) are labelled "MODE" and "SET". "MODE" is used to scroll
from seconds to minutes to hours; "SET" is used to set the time. The
procedure is to set the clock slightly ahead of the current time, hold the
second count at "00" until the current time catches up, and then release
the count.
2) Press the MODE button until the hour digits blink. Depress the SET
button until the desired hour is displayed.
3) Press the MODE button until the minute digits blink. Depress the SET
button until the desired minute count is displayed.
4) Press the MODE button until the second digits blink. Depress and hold
the SET button; the seconds display will hold at "00". When the current
time catches up to the display, release the SET button. The clock will start
counting. Hit the MODE button once more to place the clock into
working mode.
Capacitor Backup
With the meterbridge open note the super capacitor at C20. This super
capacitor is self charging. Note that the super capacitor does NOT light up
the clock display; it powers the clock crystal to keep it from losing count
(it will do this for about one hour).
Operational Modes
The standard factory default clock configuration is crystal-controlled,
12 hour mode, stand-alone operation. However, the clock will operate
either from the internal crystal controlled time base or from an ESE master
(TC-89, autodetect) signal. Because crystal time bases are subject to drift
over time, Wheatstone recommends operating the clock in the ESE slave
mode for those applications where the exact time is critical. Connect an
ESE master at connector CT6 (Pin 1 - Signal, Pin 2 - Shield).
The clock can also be synchronized to external 60Hz or 1Hz signals.
To synchronize to a 60Hz signal, connect the signal to CT3 pin 1, using
CT3 pin 2 as the ground reference, and enable synchronization to 60Hz by
turning SW7 position 3 on (SW7 position 2 should be off). To synchronize
to a 1Hz signal, connect the signal to CT4 pin 1, using CT4 pin 2 as the
ground reference, and enable synchronization to 1Hz by turning SW7
position 2 on (SW7 position 3 should be off).
Standard operation is 12 hour mode, but the clock can be switched to
24 hour mode by turning SW7 position 1 on.
For operation in areas with low ambient light, the display can be
dimmed by turning SW7 position 4 on.
D-16 / June 2006
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