Casio ID-25B User Manual

MA0405-EA

Operation Guide ID-25B

ILLUSTRATION

SET

RESET

°C °F MSF DCF

WAVE

SET

°C °F MSF DCF

1cm

RESET

WAVE

• A sticker is affixed to the glass of this clock when you purchase it. Be sure to remove the sticker before using the
clock.

• Depending on the clock model, the configuration of your clock may differ somewhat from that shown in the
illustration.

Normal Display

Antenna Icon

Wave OK indicator

Receive indicator

PM indicator

Current time
(Hour, minutes, seconds)

DATE (month – date)

Current Temperature

Day of the week

Current Humidity

Transmitter Indicator
(DCF or MSF)

DST indicator

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Operation Guide ID-25B

GENERAL GUIDE

1 Time Set buttons

Use these buttons to set the current time.

2 SET button

Use this button when setting the current time.

3 RESET button

Press this button to reset the clock after replacing its batteries.

4 WAVE button

Press this button to receive the time calibration signal and adjust timekeeping.

5 Transmitter switch

Slide this switch to toggle between the two receivable time calibration signal transmitters.
DCF : Mainflingen, German transmitter (Clock displays German time.)
MSF : Rugby, England transmitter (Clock displays U.K time.)
*Note that there is one hour difference between German time and U.K time.

Make sure you select the correct setting for your region.

6 °C/ °F switch

Slide to toggle the temperature unit between Celsius and Fahrenheit.

TIME CALIBRATION SIGNAL RECEPTION PRECAUTIONS

• This clock is able to receive the time calibration signals in Mainflingen,
Germany or in Rugby, England. You can select which transmitter should
be used for reception by sliding the transmitter switch to the setting you
want.
Mainflingen: Signal reception is possible within approximately 1800 km

Rugby: Signal reception is possible within approximately 1800 km of the

• Even when the clock is within the reception range, signal reception is
impossible if the signal is blocked by mountains or other geological
formations between the clock and signal source.

• Signal reception is affected by weather, atmospheric conditions, and
seasonal changes.

• The time calibration signal is bounced off the ionosphere. Because of
this, such factors as changes in the reflectivity of the ionosphere, as well
as movement of the ionosphere to higher altitudes due to seasonal
atmospheric changes or the time of day may change the reception
range of the signal and make reception temporarily impossible.

• Reception is best when the back of the clock is facing in the direction of the selected transmitter. Note, however,
that moving the clock while the time calibration signal receive operation is taking place will make stable reception
impossible.

• Think of the clock as acting like a TV or radio when it is receiving the calibration signal.When receiving indoors,
move to a location as near as possible to a window. Proper signal reception can be difficult or even impossible
under the conditions listed below.

of the transmitter.

transmitter.

1,800 kilometers Mainflingen

Rugby

• Signal reception is normally better at night than during the day.

• Radio interference can make signal reception impossible.

• Strong electrostatic charge can result in the wrong time being set.

USING THE CLOCK

Selecting a Transmitter

Slide the Transmitter switch (5) to specify Mainflingen, Germany (DCF) or Rugby, England (MSF) as the
transmitter to be used for reception.
DCF: Select this setting to receive the Mainflingen, German transmitter signal. You should select this setting when

you live outside of the U.K.

MSF: Select this setting to receive the Rugby, England transmitter signal. You should select this setting if you live in

the U.K.

Any of the following procedures can be used to set current date and time.

• Auto receive of the time calibration signal

• Manual receive of the time calibration signal

• Manual setting without using the time calibration signal

Auto Receive

• This clock performs a 1-minute receive operation each hour.

• A signal receive operation takes from two to fourteen minutes under good signal conditions.

• A receive indicator shows the current status of the receive operation.

• More bars in the receive indicator during signal reception indicate better signal reception.

Antenna Icon

The antenna icon appears when at least one signal receive operation is successful during a day. The antenna
icon is cleared at 2 a.m. and 3 a.m. each day, and will reappear as soon as a subsequent signal receive
operation is successful.

Wave OK Indicator

The Wave OK indicator is displayed when there has been a successful receive operation within the last hour.
This indicator disappears at the top of each hour, or when you perform a manual receive operation.

Unsuccessful Signal Reception

The antenna icon disappears from the display if no signal receive operation is successful during a continuous
24-hour period. If this happens, try changing the position or orientation of the clock, and press the WAVE

button (4) to receive again.

Manual Receive

• Press the WAVE button (4) to start a calibration signal receive operation.

• Use the WAVE button (4) to perform a receive operation after replacing the clock’s batteries or if the auto

receive operation was not performed correctly for some reason.

• The antenna icon appears when signal reception triggered by the WAVE button (4) is successful.

Important!

• Do not perform any button or switch operation while a signal receive operation is in progress.

• The time calibration signal includes both Standard Time and Daylight Saving Time (summer time) data.

• The DST indicator appears on the display when Daylight Saving Time (summer time) data is received.

• Note that Daylight Saving Time (summer time) is turned on and off in accordance with the received time

calibration signal only. You cannot turn it on or off manually.

Inside, among
buildings, or near
neon signs

Inside a vehicle Near refrigerators

or other household
appliances, near
office equipment,
mobile phones or
wireless LAN
devices.

Near a
construction site,
airport, or other
sources of
electrical noise,
underground or in
tunnels, near
railroads,
highways, or radio
stations with
interfering
frequencies.

Near high-tension
power lines

Among or behind
mountains

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