Casio 2891 User Manual

MA0509-EA

Operation Guide 2891

Keep your watch exposed to light!

Your watch runs on electrical power generated from light and stored by a chargeable battery. To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.

1. How the solar cell and battery work

When exposed to light

When not exposed to light

Your watch continues to operate, even when it is not exposed to light. Leaving the watch in the dark can run down its battery and cause functions to become disabled.

Light

Rechargeable battery

Power supplied to watch

Rechargeable battery

Power supplied to watch

Solar cell

Electrical energy

Charge

Discharge

2. Avoid overuse of display illumination.

• Over use of display illumination can run down the battery.

Rechargeable battery

Power supplied to watch

The following shows approximately how much exposure to light is required to recharge the battery by the amount used by one display illumination operation.

• Sunlight through a window: 5 minutes

• Indoor fluorescent lighting: 50 minutes

Care is required when using the full auto light switch, which can cause frequent display illumination.

Using Your Watch for Mountain Climbing

Discharge

3. Tips on how to keep the battery charged.

• Try to ensure that the watch is always exposed to enough light to keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the watch’s functions are disabled when battery power drops to LEVEL 3.

Light

Battery Indicator

Level 1 Level 2

Rechargeable battery

• Whenever you are not wearing the watch on your wrist, position it so the face (solar cell) is pointed in the direction of a source of bright light.

Solar Cell

Your watch has a number of built in sensors that allow you to take direction, altitude, barometric pressure, and temperature readings while mountain climbing or hiking.

Light

Level 3 Level 4

Leave the watch under fluorescent lighting, near a window, etc.

All functions enabled

Some functions disabled

• When wearing the watch, try to keep your sleeve from blocking its face (solar cell).

Charging efficiency is significantly reduced even if the face of the watch is only partially covered by your sleeve.

. Before getting started...

Check changes in barometric pressure to get an idea of what kind of weather to expect.

• See “Taking Pressure and Temperature Readings” for more information.

Pressure Tendency Graph

Barometric Pressure

Pressure/Temperature Mode

Temperature

Pressure Differential Graphic

. After you start climbing...

• Monitor the altitude on the display to see how high you have climbed. You can also record altitude records (including date and time) in memory.

• See “Taking Altitude Readings” for

more information.

Altitude Graph

Altitude

Altitude Mode

Differential Graphic

Current Time

• Use the digital compass to keep track of your current bearing.

• See “Taking Direction Readings” for

more information.

Digital Compass

Direction Angle

Compass Mode

Current Time

• You can also keep track of the current barometric pressure and temperature while climbing.

• See “Taking Pressure and

Temperature Readings” for more information.

Pressure Tendency Graph

Barometric Pressure

Pressure/Temperature Mode

Temperature

. After you get back home...

Recall altitude records from memory to retrace your climb and to make plans for your next climb.

• See “Viewing Altitude Memory Records” for more information.

Modes and Display Screens

Operation Guide 2891

• Use the A, B, and C buttons to enter each measurement mode, and automatically start taking the applicable readings. Press the D button to return to the Timekeeping Mode.

• If your do not perform any button operation for about nine or ten hours while in the Altitude Mode, the watch automatically returns to the Timekeeping Mode.

Compass Mode

Use this mode to keep track of your bearing.

Timekeeping Mode

Hour, Minutes

Day of the Week

Button

Pressure/Temperature Mode

This mode measures barometric pressure and temperature. It also displays the pressure tendency graph.

Altitude Mode

This mode measures your altitude. You can store altitude readings in memory for later recall.

PM indicator

(no display

for AM)

Button

Switching between Display Screens

Each press of the button switches the display between the day of the week/day, and the month/day.

Day of the Week Month, Day

Button

(Light)

Button

Seconds

Button

Power Saving

Power Saving causes the watch to enter a sleep state automatically in order to save power whenever it is left in the dark. The Power Saving feature of the watch is turned on at the factory.

• Note that the watch may also enter the sleep state if the watch is blocked from light by your sleeve.

• Each press of the D button causes the watch to beep and cycles through the Recall Mode, World Time Mode, Stopwatch Mode, Timer

Mode, Alarm Mode, and Receive Mode as shown below.

• If you do not perform any button operation for two or three minutes while in the Recall Mode, Alarm Mode, Receive Mode, Compass Mode, or Pressure/Temperature Mode, the watch will return to the Timekeeping Mode automatically.

Recall Mode

Use this mode to recall altitude records.

Receive Mode

Use this mode to check the date and time of the last successful signal reception, and to perform manual receive. You can also turn auto receive on and off in this mode.

Alarm Mode

Use the Alarm Mode to set the alarm, and to turn the hourly time signal on and off.

World Time lets you display the current time in any one of 30 cities (29 time zones) around the world.

The stopwatch performs 1/100 second elapsed time measurement up to 9 hours, 59 minutes, 59.99 seconds (10 hours).

The Timer Mode lets you set a start time up to 60 minutes in 1-minute steps. An alarm sounds for five seconds when the end of the countdown is reached.

World Time Mode

Stopwatch Mode

Timer Mode

How the sleep state works

• Display sleep state

The display sleep state is triggered whenever the watch is left in the dark for about one hour between the hours of 10 p.m. and 6 a.m.

• The watch does not enter the sleep state if it is in the Timer Mode or Stopwatch Mode.

• The display sleep state causes the display to go blank, except for a flashing Power Saving indicator. Alarm, hourly time signal, and Timer Mode progress alert and time up alert operate normally in the display sleep state.

• Function sleep state

The function sleep state is triggered whenever the watch is left in the dark for six or seven days.

• The Power Saving indicator stops flashing and remains on the display. Alarm, hourly time signal, and Timer Mode progress alert and time up alert do not operate in the function sleep state. In the function sleep state, 2-hour barometric pressure readings and auto receive also are not performed.

• Digital timekeeping functions continue to operate normally in

the function sleep state.

Power Saving Indicator

❚

To recover from the sleep state

Place the watch in an area that is well-lit, press any button, or angle the watch toward your face to illuminate the face of the watch using the full auto light switch (“Positioning Your Arm Correctly”).

• It can take up to two seconds before display figures re-appear after you place the watch in a well-lit area.

❚

To turn Power Saving on and off

See the procedure under “To configure Home City settings” for information about turning off Power Saving.

Leaving the watch in a drawer or anywhere else it is dark can cause Power Saving to trigger in order to conserve battery power.

Power Supply

The power supply of this watch uses a solar cell to generate electrical power, which is stored by a rechargeable battery. Using or storing the watch where it is not exposed to light regularly or allowing it to be blocked from light by your sleeve as you are wearing it can cause the power of the rechargeable battery to run down. To ensure stable operation, be sure to allow the watch to be exposed to light as much as possible when you are wearing or storing it.

Note that all data in memory and all settings are cleared whenever you allow the level of the rechargeable battery to drop to Level 5.

Recover Indicator

If you use the light or alarms a number of times during a short period, the RECOV indicator may appear on the display to indicate that the following operations are disabled in order to allow battery power to recover.

• Illumination

• Alarm and hourly time signal

• Timer Mode progress alert and

time up alarm

• Sensor readings

Normal operation will return after the battery recovers.

Recover Indicator

Operation Guide 2891

Battery Indicator

Level

• Exposing the watch to direct sunlight or other strong light may cause the battery level indicator to indicate a level that is momentarily higher than the actual battery level. Because of this, you should wait for a short while after charging to check the battery level indicator.

• Even if the battery level drops all the way to Level 5, you still will be able to recharge the battery and use the watch again.

• If you start charging from Level 5, the display of the watch will flash when the battery reaches Level 4. Note, however, that the watch’s functions will still remain disabled at this time, and you should continue to expose the watch to light so the battery can charge up the Level 2 or Level 1.

All functions enabled.

Illumination, alarms and other tones, sensor readings, and time calibration signal reception disabled.

Digital display, illumination, alarms and other tones, sensor readings, and time calibration signal reception disabled.

All functions, including timekeeping, disabled.

Start charging at Level 4!

Battery Level 4 indicates that remaining battery power is very low. Be sure to expose the watch to light for recharging as soon as possible after the Level 4 indicator starts to flash. Frequent display of the recover indicator also means that the battery is low. Expose the watch to light to charge the battery.

Charging Precautions

Avoid charging the watch in the following locations, and anywhere else where the watch may become very hot.

• On the dashboard of an automobile parked in the sun

• Very close to an incandescent light source or other sources of heat

• In a location exposed to direct sunlight for long periods

Note that the display panel may become black under very high temperatures. This is temporary, and the display will appear normal again at lower temperatures.

Depending on the light source you are using, the case of the watch may become quite hot during charging. Take care to guard against burn injury after charging.

❚

To charge the battery

Point the solar panel (face) of the watch at a light source.

• Remember that even a partial blockage of the solar cell reduces charging efficiency.

Example: Positioning the watch

Solar Cell

• The illustration shows the resin band model.

Charging Guide

Starting from a full charge, the watch should be able to continue operating for about five months without further charging under the example conditions described below.

Example Daily Use

• Illumination: 1.5 seconds/day

• Alarms: 10 seconds/day

• Direction Reading: 10 times/week

• Altitude Readings: 10 hours/month

• Signal Reception: 6 minutes/day

• Digital Display: 18 hours/day

Making sure the watch is exposed to light regularly ensure stable operation.

• Charge Times Required to Advance to a Higher Level

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a

Window (10,000 lux) Overcast Daylight

Through a Window

(5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

• Note that the above charging times are for reference only. Actual charging time depends on a variety of environmental factors.

Approximate Exposure Time

Level 5 \ Level 4 \ Level 3 \ Level 2 \ Level 1

2 hours

4 hours

8 hours

80 hours

Required Daily Charging Time

•

The following is the daily amount of charging required each day to support the operations under “Example Daily Use”.

Exposure Level

(Brightness)

Outdoor Sunlight

(50,000 lux)

Sunlight Through a Window (10,000 lux)

Overcast Daylight

Through a Window

(5,000 lux)

Indoor Fluorescent

Lighting (500 lux)

Approximate

Exposure Time

5 minutes

24 minutes

48 minutes

8 hours

6 hours13 hours

29 hours63 hours

58 hours128 hours

– – – – – –

Power Loss Drop during Sensor Readings

Regardless of whether the current battery level is Level 2 or higher, the watch may determine that the current power level is not enough to driver the sensor in the Compass, Pressure, or Altitude Mode. If this happens, the display will appear as described below.

After Entering the Mode

Compass

Pressure

Altitude

• Normal operation should return after battery power recovers.

Blank

During Readings

– – –

Illumination

An EL (electro luminescent) panel is used for illumination for easy reading in the dark. A full auto light switch turns on illumination automatically when you angle the watch towards your face for reading.

❚

To turn on illumination manually

In any mode, press the button.

• You can specify 1.5 seconds or

2.5 seconds as the duration of display illumination (“To specify the illumination duration”).

• Pressing the L button turns on illumination regardless of

whether the full auto light switch is on or off.

You may hear a faint rattling sound when you move the watch around. This sound is caused by the movement of a metal bulb that controls operation of the full auto light switch, and does not indicate malfunction.

Operation Guide 2891

❚

To turn the full auto light switch on or off

The full auto light switch turns on illumination automatically whenever you angle the watch towards your face for reading, but only when it is dark.

• The full auto light switch does not turn on illumination when surrounding light is bright.

The full auto light switch turns on illumination for the specified illumination duration in all modes when the watch is angled towards the face.

In any mode (except when a setting screen is on the display), hold down the L button for about three seconds to toggle the full auto light switch on ( indicator displayed) and off (no indicator displayed).

Full Auto Light Switch On Indicator

(3 seconds)

❚

Positioning Your Arm Correctly

With the watch on your wrist, position it parallel with the ground.

• You should be wearing the watch on the outside of your wrist when using the full auto light switch.

• Make sure that the left (9 o’clock) and right (3 o’clock) sides of the watch are within ±15 degrees of being parallel with the ground. The full auto light switch may not operate properly if the angle is greater than 15 degrees.

Illumination Precautions

• The light may be difficult to see under bright sunlight.

• Illumination turns off automatically if an alarm sounds, etc.

• You may notice a slight sound from the watch while

illumination is turned on. This is the sound of EL panel vibration and does not indicate malfunction.

• Illumination is disabled during time calibration signal reception, while configuring sensor measurement mode settings, and during direction sensor calibration (“Calibrating the Direction Sensor”).

Rotate your arm so the watch is angled at about 40 degrees, so you can read its face.

At least 40 degrees

Full Auto Light Switch Precautions

• Frequent use of the full auto light switch can run down the battery.

• The full auto light switch may turn on illumination when the face of

the watch is shaded by your sleeve.

• Illumination may not turn on immediately when you angle the watch towards your face. This does not indicate malfunction.

• Illumination remains on for the specified duration (1.5 seconds or

2.5 seconds) only, even if you leave the watch angled towards your face.

• The full auto light switch is disabled automatically whenever the battery indicator reaches Level 4.

• Illumination may turn on unintentionally when you wear the watch on the inside of your wrist, when you shake your arm, or when you raise your arm. Be sure to turn off the full auto light switch whenever you do not need illumination.

• Keep the full auto light switch turned off whenever you are wearing the watch on the inside of your wrist.

• Electro-static charge and magnetism can interfere with full auto light switch operation and even make operation impossible. If this happens, lower your arm to the starting position and then raise it again. If you still have trouble with illumination, try lowering your arm down to your side and then raise it to your face for reading.

• The full auto light switch is disabled during the 20 seconds required to take a direction reading with the digital compass.

To specify the illumination duration

1. In the Timekeeping Mode,

hold down the for about two seconds until the city code and GMT differential start to flash. This is the setting screen.

2. Press the

times so the seconds are flashing.

E button

D button three

(2 seconds)

City Code

(3 times)

3. Press the

• : 1.5 seconds

4. When the setting is the

• The display also will exit the

A button to

toggle the display illumination between 1.5 seconds and 2.5 seconds.

: 2.5 seconds

way you want, press the

E button to exit the

setting screen.

setting screen automatically if you do not perform any operation for about two or three minutes.

1.5 Seconds

2.5 Seconds

Operation Guide 2891

How a Radio-controlled Watch Works

What is a radio-controlled watch?

Your radio-controlled watch is designed to receive a time calibration signal that contains standard time data, and adjust its current time setting accordingly.

Signal is received by

Tr ansmitter

Cesium

atomic clock

After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.

Long-wave time calibration signal

Signal data

Time data

Internally

Watch

built-in antenna.

Decode

Watch decodes received data and converts it to time data.

Time is adjusted according to time data.

Receiving the Calibration Signal

There are two methods you can use to receive the time calibration signal.

• Auto receive (Reception is performed automatically at midnight, 1:00, 2:00, 3:00, and 4:00 each morning.)

•

Manual receive (You initiate reception using a button operation.)

• Once auto receive is successful on a particular day, the auto receive operation for subsequent times are not performed for that day.

•

If reception is not successful for any of the normal auto receive operations shown above, auto receive is performed one more time at 5:00 a.m.

• The watch is set up for auto receive at the factory, so all you need to do is to place it in a location that allows good reception each night.

❚

To position the watch for optimum reception

Remove the watch from your wrist and place it somewhere so its top (12 o’clock, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep it away from metal objects.

Resin Band

Metal Band

• Orienting the watch so it is sideways to the transmitter makes it more difficult to receive the signal.

• Do not move the watch while it is receiving the calibration signal.

Calibration Signal

• The Japanese calibration signal (Call Sign: JJY) is maintained by the National Institute of Information and Communications Technology (NICT). It is transmitted 24 hours a day from the Mt. Otakadoya transmitter (40kHz) located in Tamura-gun, Fukushima Prefecture, and from the Mt. Hagane transmitter (60kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

Though the calibration signal normally is transmitted 24 hours a day, transmission may be interrupted occasionally due to maintenance, lightning, etc.

Time Required for Reception

Signal reception takes anywhere from about two to seven minutes.

•

Under certain conditions, signal reception can take as long as 14 minutes.

• See “Configuring Auto Receive Settings” for more information about auto receive.

❚

To perform manual receive

1. In the Timekeeping Mode, press the

times to enter the Receive Mode.

C button.

C button

2. Hold down the

for about two seconds.

• The watch will beep and reception will start. The display will flash and the receive icon ( ) will start to cycle through its numbers.

❚

To interrupt reception

Press the

• All other buttons besides C are disabled during signal reception.

When reception is successful

The watch terminates reception and adjusts the current time. Next it beeps and then displays the date and time the adjustment was performed.

• The “ ” icon (with all numbered segments visible) on the display also indicates successful signal reception.

When reception fails

The watch does not adjust its current time setting and displays “ERR” when signal reception is unsuccessful for some reason.

•

The display will return to the normal timekeeping screen automatically if you do not perform any operation for about one or two minutes.

D button six

(2 seconds)

Reception Ranges

With this setting, the watch automatically selects either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz), whichever is strongest.

1000km

Receive Icon

500km

1000km

Mt. Otakadoya

(40kHz)

Transmitter Location

Mt. Hagane

(60kHz)

• Under optimum conditions, the calibration signal should be receivable up to 1,000 kilometers from the transmitter. Note that the wave is relatively weak at distances greater than 500km, so reception may be poor at long distances.

• Geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

• Best reception is possible late at night.

500km

Receive Icon

The receive indicator cycles from “Unstable” through “Stable” as shown below while reception is in progress. How far it cycles depends on the signal strength. Keep the watch in a location where reception is stable while reception is in progress.

Unstable Stable

• Even under optimum reception conditions, it can take about 10 seconds for reception to stabilize.

• Use the receive icon to check reception status and to determine the best location for signal reception.

• Note that weather, the time of day, surroundings, and other factors can all affect reception.

Location

Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.

• You should think of your watch operating like a radio or TV when it is receiving the calibration signal.

Among or near buildings

Inside a vehicle (automobile, train, plane, etc.)

In a location where there is radio interference (construction site, airport, etc.)

If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.

❚

To view the last reception date and time

In the Timekeeping Mode, press the enter the Receive Mode.

• This displays the date and time when signal reception was last successful, and the current time and date were last adjusted.

• To return to the Timekeeping Mode, press the D button again.

• The display will return to the normal timekeeping screen

automatically if you do not perform any operation for about one or two minutes.

Reception Time

(6 times)

Near high-voltage lines

Next to a household appliance or office equipment (TV, speaker, fax, computer, cell phone, etc.)

Near mountains

D button six times to

Reception Date

Operation Guide 2891

Configuring Auto Receive Settings

Use the procedure below to turn auto calibration signal reception on and off.

• The following is the procedure for configuring auto receive settings when TYO (Tokyo) is selected as the Home City.

1. In the Timekeeping Mode,

2. Hold down the

press the

D button six

times to display the last reception date and time.

E button

for about two seconds until the current On/OFF setting starts to flash on the display. This is the setting screen.

(6 times)

(2 seconds)

3. Press the

4. When the setting is the

• Press the D button to return

• The display also will exit the setting screen automatically if

C button to

toggle the setting between On and OFF.

way you want, press the

E button to exit the

setting screen and return to the reception date and time screen.

to the Timekeeping Mode.

you do not perform any operation for about two or three minutes.

Troubleshooting

The watch cannot receive the time calibration signal.

• Is the signal being transmitted? Though the time data of the Japanese calibration signal (Call Sign: JJY) is maintained by the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT), it may sometimes be interrupted for periodic maintenance work, or because of lightning or other problems.

• Are you within the reception range of a transmitter? See “Reception Ranges” for information about areas where the watch can receive the signal.

• Is there something in the immediate area that may be interfering with reception? Even if you are within the reception range of a transmitter, objects between you and the transmitter or electrical noise can interfere with reception. Avoid such areas during signal reception. See “Location” for more information.

• Do you have the correct Home City code selected? Signal reception is not performed when the Home City setting is any city code other than TYO (Tokyo). For details about setting the correct Home City, see “To configure Home City settings”.

• Is auto receive turned off? Use the procedure under “Configuring Auto Receive Settings” to turn on auto receive.

• Barometric pressure readings (at the top of each even-numbered hour) take precedence over auto receive. For hours when both are scheduled, auto receive is performed about one minute past the top of the hour.

• Is the watch in any mode other than the Timekeeping Mode or World Time Mode during the auto receive times (midnight, 1:00 a.m., 2:00 a.m., 3:00 a.m., 4:00 a.m., and 5:00 a.m.)? Auto receive is performed only when the watch is in the Timekeeping Mode or World Time Mode. It is not performed if the watch is in any other mode.

Time calibration signal reception is successful, but the hourly time signal and current time are slightly off.

• After the watch receives the time calibration signal, it performs an internal decoding process before updating its time setting. Because of this, the time setting may be slightly off (within one second).

Time calibration signal reception is successful, but the current time is one hour fast.

• Do you have summer time (DST) turned on? Use the procedure under “To configure Home City settings” to change the summer time setting to OFF.

Time calibration signal reception is successful, but the current time setting is wrong.

• Is TYO (Tokyo) selected for your Home City? For details about setting the correct Home City, see “To configure Home City settings”.

Can you configure auto receive settings?

• Auto receive settings cannot be configured when the Home City setting is any city code other than TYO (Tokyo). For details about setting the correct Home City, see “To configure Home City settings”.

When the time zone setting is TYO

• On

Selecting this setting turns on auto receive and auto transmitter selection. The watch automatically selects either the Otakadoya Mountain signal (40kHz) or the Hagane Mountain signal (60kHz), whichever is strongest.

• OFF

Selecting this setting turns off auto receive and auto transmitter selection.

When is auto receive performed?

• Auto receive is performed in the middle of the night, when reception conditions are best. Before going to bed at night, place the watch near a window, with 12 o’clock facing in the general direction of the transmitter.

How can I view the last reception date and time?

• In the Timekeeping Mode, press the D button (lower left) six times to enter the Receive Mode. This will display the date and time that the time calibration signal was last received successfully. To return to the Timekeeping Mode, press the D button again.

How can I perform manual receive?

• In the Receive Mode, hold down the C button (lower right) for about two seconds. The watch will beep to indicate that manual receive has started. Place it near a window, with 12 o’clock facing in the general direction of the transmitter.

Calibration Signal Reception Precautions

• Auto receive can be performed while the watch is in the Timekeeping Mode or World Time Mode only.

• Signal reception is not possible when any one of the following conditions exists.

• Timer operation in progress

• Battery at Level 3 or Level 4

• Recover indicator (RECOV) displayed

• While altitude recording is being performed (Manual signal

reception can still be performed.)

• Operating any button while auto receive is in progress will cause the watch to beep and then exit the receive operation.

• Make sure you are within the range of the calibration signal transmitter before performing the reception operation. Remember that geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

• Proper reception may be impossible if there is something blocking the signal. If reception is unsuccessful, try again.

• This watch is designed to adjust its current time setting in accordance with the calibration signal transmitted in Japan only. Note that you will need to make your own adjustments when using this watch outside of Japan, or in any area that is outside the range of one of the receivable time calibration signal transmitters.

• When the watch is unable to adjust its time signal using the calibration signal for some reason, timekeeping accuracy is within

±15 seconds per month.

• Strong electrostatic charge can cause timekeeping error.

• Signal reception is cancelled if an alert operation is starts while it

is being performed.

• The watch’s calendar shows dates up to the year 2099. Attempting a receive operation after that causes an error.

• If you cannot receive the calibration signal or if the current time setting is incorrect after signal reception, check the current setup of the watch.

• The following are the watch’s factory default settings, which are

configured automatically whenever you have the battery of the watch replaced.

Auto Receive

Home City

Summer Time

Tokyo

Auto (according to signal data)

+ 12 hidden pages