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Atomic DCF77 Clock
14
Troubleshooting and maintenance
The DCF PC CLOCK is an advanced high quality product which has been developed to guarantee
the exact time and date under all conditions.
If there are problems with the installation of the DCF PC CLOCK then the next information may be
helpful.
1. Setting the time in the computer/server (requested by the user running the DCFxxx /s program)
when the time is not valid requires the user's confirmation (DCFxxx may be DCFDOS or
DCFNVL).
2. To keep the valid time in the Central Unit it must receive at least 19 correct impulses from the
DCF transmitter per 18 hours.
Losing the valid time requires receiving four times full DCF information to guarantee the correct time
& date again, i.e. four times 59 correct impulses.
3. The Central Unit has an additional battery backed up Real Time Clock, which enables it to
maintain the correct time and date in case of power failure, but not longer than 18 hours since the
last complete DCF transmission.
If the DCF Receiver is correctly oriented and located, it is highly unlikely that it does not receive at
least one proper DCF transmission within the period of 18 hours.
Warning: In a new DCF PC Clock the battery may not be fully charged. The Central Unit should
be switched on for at least several hours (a charging time of ca 48 hours is required for a fully
charged battery).
If the Central Unit is switched off before recharging is completed, the data stored in its memory may
be lost.
4. While the mains is not connected or during a power failure, the Central Unit clock will not receive
the DCF signal and the Central Unit will not be synchronized.
5. Season related time changes are handled automatically.
6. The DCF signal is transmitted at a low frequency (77.5kHz); hence, the radiowave spreads close
to the ground and is susceptible to interference (the weather conditions, time of day, industrial influ-
ences). Therefore it is possible that in some extremely affected regions receiving the signal is only
possible at certain times of the day.
In particular this may concern some big industrial centers.
Interference’s may be aggravated by sunrise, sunset, closeness of other electronic devices (monitors,
computers, TV sets, engines, etc.)
If receiving the signal should prove impossible, you must try to locate the source of the interference.
To exclude the computer or monitor as a source of interference, try the following steps:
Switch off the computer, disconnect the RS232 cable from the computer and see if the DCF
Receiver functions properly.
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