Working Principle - Velleman WC1857 Notice D'emploi

Rear
A RESET button
B °C/°F button
C Hour/month button
D Minute/date button
E 12h/24h/year button
Remote sensor
S1 LCD
S2 Status LED
S3 °C/°F button

6. Working principle

The WC1857 contains a receiver which receives a radio-signal from a radio station located at
Mainflingen near Frankfurt, Germany. This long-wave radio-signal (DCF77, 77.5 kHz) is based on
atomic clocks and contains time and date information. For more information refer to
(PTB = Physikalisch- Technische Bundesanstalt).
The WC1857 automatically synchronizes with this master clock radio-signal.
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. Installation/operation
Refer to the illustrations on page 2 of this manual.
Clock
• Insert batteries in the battery compartment [I] (see §9).
• Choose a location for the clock (refer to §6). The clock can be wall mounted or placed on a
desktop using the foldable stand (see illustration on page 2 of this manual).
• Wait until the clock receives the synchronization signal from the master clock. This might take up
to 15 minutes. Note that the received signal is usually stronger at night time.
• Once synchronized, the clock will show the correct time. The DCF and WAVE OK indications [2]
are shown.
• When the clock doesn't receive the radio-signal, it will start to run showing the wrong time.
However, it will keep attempting to synchronize for 10 minutes every 3 hours. Meanwhile, the
clock can be set to the correct time manually (see below).
• To force wave detection, press the wave button [F]. Note that frequent use of this feature will
shorten battery life time.
• Default the clock is in 12h format (AM or PM indicated in front of the time). Press the 12/24h
button [E] to switch to 24h format.
Setting the clock manually
• The time can be set manually when the clock is used in a place without DCF reception (e.g. a
basement) or in case synchronization is temporarily not possible. Note that because of
atmospheric conditions at night time the DCF signal is stronger and travels further.
• Slide the time set switch [G] to the TIME SET position (middle).
• The time [1] indication will flash. Set the hour resp. minutes by pushing the hour [C] resp.
minutes [D] buttons.
• Slide the time set switch [G] back to the lock position (left).
03.12.2009
WC1857
F Wave button
G Calendar/time set/lock switch
H Re-sync button
I Battery compartment
J Foldable stand
S4 RESET button
S5 Battery compartment
S6 Foldable stand
S7 Wall mount bracket hook.
4
www.ptb.de
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