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6.
Working principle
The clock contains a receiver, which receives a radio-signal from a radio station
located near Frankfurt, Germany. This long-wave radio-signal (DCF77) is based
on atomic clocks and contains time and date information. The clock automatically
synchronizes with this master clock radio-signal and when necessary adjusts the
positions of second, minute or hour hands of the clock.
Due to its nature, the radio-signal can be received indoors. However, it should be
noted that the signal is weakened by the presence of concrete and metal.
Therefore, the clock must not be installed in concrete basements or inside metal
cages. In large concrete office buildings or apartments, the clock should be
located near a window for better reception.
Also, avoid installing the clock near strong magnetic fields or other devices that
generate a lot of electrical noise (e.g. engines).
7.
Operation
General Operation
1.
Insert a battery in the battery compartment. All hands will move forward
towards 12:00. Note: when the original position of the second hand is
between 11:55 and 12:00, the second hand will make a full turn before
stopping at 12:00. The same happens with the minute hand when the
original position is between 11:52 and 12:00.
Choose a location for the clock (see chapter "Working Principle").
2.
3.
Wait until the clock receives the synchronization signal from the master
clock. This might take up to 7 minutes. Note that the received signal is
usually stronger at night time.
4.
Once synchronized, the hands will start moving towards the correct time.
5.
When the clock does not receive the radio-signal, it will start running
showing the wrong time. However, it will keep attempting to synchronize.
Manual Setting
It is possible to set the time manually, e.g. for use in places where no radio-
signal is received.
1.
Press and hold the manual setting button. After ± 3 seconds the minutes
and hour hands start moving.
2.
Hold down the manual setting button and release a couple of minutes
before desired time setting.
3.
Press the manual setting button repeatedly until the desired time indication
is reached. When no press is detected within 7 seconds, the clock starts
running.
Forced Receiving
1.
To force the clock to synchronize, press and hold the forced receiving
button for ± 3 seconds. The current time is stored in memory and all hands
will start moving towards 12:00. The clock attempts to synchronize with the
master clock.
2.
When synchronization is successful, the hands will move towards the
correct time. If it fails however, the hands will move towards the time that
was memorized.
V. 01 – 07/12/2017
WC30D5
5
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