Техническая Спецификация для C&E - Digital Alarm Clock C8245

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The purpose of the radio-controlled travel clock is to decode the DCF-radio signal of the caesium
atomic clock in Braunschweig (Germany), to display the time, date and the external temperature
as well as to provide an alarm function.
It may only be used indoors; do not use outdoors. Contact with moisture, for example in bath-
rooms, must be avoided.
The radio-controlled travel clock is only approved for battery powered operation. Do not use any
other power source. The suitable battery type is listed in the “Technical Data” section.
Any use other than described above is not permitted and can damage the product. In addition,
it can lead to dangers such as short-circuit, fire and electrical shock.
The safety instructions have to be followed without fail!
This product complies with the applicable National and European specifications.

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• For safety and approval (CE) reasons, unauthorised conversion and/or modifications to the

product are not permitted.

• Do not expose the product to high temperatures, strong vibrations or heavy mechanical loads.
• If you have any doubts about the correct operation, or the safety of the product, please con-

sult a specialist.

• Keep the product and the batteries out of the reach of children. They are not toys.
• Do not leave packing materials unattended. They may become dangerous playthings for 

children.

• Please observe the additional safety instructions in the individual chapters of this manual.

(1) SNOOZE/LIGHT button

(6) °C/°F button

(2) Display

(7) RESET button

(3) MODE button

(8) Battery compartment

(4) ALM ON/OFF button

(9) Base

(5) ADJ button

The radio-controlled travel clock has a DCF controlled clock mechanism, which automatically
synchronizes the time display to the DCF-signal.  It is no longer necessary to set the time man-
ually. 
The time is adjusted by synchronising with the DCF-signal from the caesium atomic clock at the
“Physikalisch Technischen Bundesanstalt” in Braunschweig (Germany). This ensures that it
achieves a very high operational precision. The clock also operates as a high precision quartz
clock, when there is failure in the radio reception.

7

8

SNOOZE / LIGHT

1

9

A DJ

R A D I O

C O N T R O L L E D

2

3
4

5
6

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What is DCF?
The DCF-signal is an encoded radio signal, which receives the time information from the cae-
sium atomic clock at PTB Braunschweig.
This atomic clock is so accurate that the theoretical possibility of a deviation of +/- 1 second is
only one in one million years. 
The DCF-signal is encoded and transmitted via a DCF-transmitter in Mainflingen near Frankfurt.
The transmitter has a range of approximately 1,500 km.
Clocks that are equipped with a DCF receiver can receive and decode the DCF-signal within this
transmission range.
It is not necessary to set the time manually with a DCF clock, e.g. changing the time from winter
to summer time.
Reception of the DCF-signal like other broadcasts is dependent on place and position, as well
as on interference, e.g. from computers, televisions or microwaves. 
Rooms with reinforced concrete construction, which weaken the DCF-signal, can also be a fur-
ther reason for poor reception.

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• Open the cover of the battery compartment (8) on the back of the device.
• Insert three new 1.5V micro-batteries (AAA) in the battery compartment, paying attention to the

polarity markings. The correct polarity is indicated in the battery compartment.

• Close the battery compartment (8) again.
• After a few seconds, the clock begins searching for the DCF-signal and starts a reception

attempt. Do not press the buttons during this stage.

• When the display’s contrast fades or when the display light no longer flashes, the batteries are

flat and need to be replaced as described above.

• To ensure long battery life, only use alkaline types.

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The use of rechargeable batteries leads to a reduced operating time, because of
the lower voltage and capacity.

• After inserting the batteries, the clock is automatically set to the current time. 
• Do not press the buttons during this process.
• The reception power of the DCF-signal is shown on the left, next to the seconds display (2),

by an aerial symbol. The more segments that are lit, the better the reception.

• Place the clock so that, where possible, many segments are shown. The best place for a syn-

chronisation is preferably a place by the window, and where possible far away from electron-
ic devices. 

• Normally, this synchronisation process is completed in a few minutes.  The clock then shows

the current time and date on the display. 

• If  DCF-reception is not possible, no segments are displayed above the aerial symbol. 

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If the DCF reception is disturbed, try to find another position and/or leave the clock
near a window during the night. 
At night the reception is better, so the clock is normally synchronized the next 
morning. 

• To start the manual synchronisation process, just press the °C/°F (6) button for longer than

three seconds.

• The aerial symbol flashes and the synchronisation process starts as described above. 

• Press the button ALM ON/OFF (4) while the display shows the time as normal and keep it

pressed, until the hour indication starts flashing. 

• Use the ADJ (5) button to set the hours. 
• Press the ALM ON/OFF (4) button again.
• Set the remaining parameters as described above in the following order:

minutes > seconds > 12/24h-format > year > month > day

• Push the MODE (3) button, to save the settings and to return to the normal time display. 

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By pushing the ADJ (5) button slightly longer, the values for the setting are changed
continuously.
When a button has not been pressed for a longer period during the setting, the clock
will automatically leave the setting mode.

• Press the MODE (3) button with the normal time displayed to change the alarm indication. 
• Press the button ALM ON/OFF (4)  and keep it depressed, until the hour indication flashes. 
• Use the ADJ (5) button to set the hour indication. 
• Press the ALM ON/OFF (4) button again.
• Now, set the minutes as described above, 
• Push the MODE (3) button, to save the settings and to return to the normal time display. 

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By pushing the ADJ (5) button slightly longer, the values for the setting are changed
continuously.
When a button has not been pressed for a longer period during the setting, the clock
will automatically leave the setting mode and saves the set alarm time.

• Push the ALM ON/OFF (4) button to activate or deactivate the alarm function. 
• When the alarm function is activated the alarm symbol will be shown on the left, next to the

seconds display. 

• The alarm signal sounds at the time set, when the alarm function is activated. 
• To deactivate it for 24 hours, just press the SNOOZE/LIGHT (1) button. 
• To activate the snooze function, press de ALM ON/OFF (4) button twice, so the alarm and

snooze symbol appear on the left, next to the seconds display. 

• Press the SNOOZE/LIGHT (1) button, when the alarm signal sounds. After about 5 minutes

the alarm signal sounds again. The max. alarm length is 60 seconds.  The alarm is repeated
five times. 

• To turn off the alarm, push the ALM ON/OFF (4) button, so the alarm and snooze symbol dis-

appear. 

• Push the ADJ (5) button, to change between the date or the year. 

• The room temperature is indicated to the right, at the bottom of the display. 
• Push the °C/°F (6) button to switch between °C and °F.

• Press the SNOOZE/LIGHT (1) button to switch on the display light.
• The light automatically goes out after several seconds.

By purchasing this radio-controlled travel clock, you have acquired a product with state of the art
design that is operationally reliable.
Nevertheless, problems or faults may occur.
This is why we would like to describe here, how possible problems can be solved:

The clock does not synchronise or has a bad reception:
• The distance to the DCF-transmitter is to far or limited by the geographic conditions. 
• Change the position and turn off interfering equipment such as televisions, computers or

microwaves. 

• Avoid placing it in the neighbourhood of large metal surfaces, which can shield the radio sig-

nals.  Further, metal vaporized windows can influence the signal reception. 

• Place the clock in front of a window to synchronise it and point the front or back in the direc-

tion of Frankfurt (Germany).

• Leave the clock to work during the night to reduce the atmospheric disturbance. 

The temperature shown is not right:
• The clock was exposed to direct sunlight. 
• The batteries are flat.

The display shows strange characters or the display is empty. The device no longer
reacts to input:
• Push the RESET (7) button with a pointed object, to reset the installed microprocessor.

This device is maintenance-free. Only clean the exterior of the device with a soft dry cloth or a
little brush.
Never use caustic cleaning agents or chemical solutions as the surface of the housing could be
damaged.

Please dispose the product, when it is no longer in use, according to the current
statutory requirements.

As the end user, you are required by law (Battery Ordinance) to return all
used batteries/rechargeable batteries; disposal of them in the household
waste is prohibited.
Contaminated batteries/rechargeable batteries are labelled with these
symbols to indicate that disposal in domestic waste is forbidden. The sym-
bols for dangerous heavy metal constituents are: Cd = cadmium, Hg = mer-
cury, Pb = lead. You can return used batteries/rechargeable batteries free
of charge to any collecting point of your local authority, to our stores or to
any other store where batteries/rechargeable batteries are sold.

You thus fulfil your statutory obligations and contribute to the protection of the environment.

Operating voltage

4.5 V dc

Batteries

3 x 1.5 V micro-cell (AAA)
Order No: 65 23 03  (order 3x)

Battery life

approx. 1 year

Time protocol

DCF

Thermometer resolution

0.1°C

Dimensions

130 x 85 x 55 mm

Weight

160 g

We, Conrad Electronic, Klaus-Conrad-Straße 1, 92240 Hirschau, hereby declare that this prod-
uct adheres to the fundamental requirements and the other relevant regulations of Directive
1999/5/EC.

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You can find the declaration of conformity at www.conrad.com.

These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240
Hirschau (www.conrad.com). 

All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming, or
the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited. 

These operating instructions represent the technical status at the time of printing. Changes in 
technology and equipment reserved. 

© Copyright 2009 by Conrad Electronic SE.