Operation Guide 2872
To turn the auto light switch on and off
In any mode except while a setting is flashing on the display, hold down L for
about two seconds to toggle the auto light switch on ( | displayed) and off | |
( | not displayed). |
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• The auto light switch on indicator (
) is on the display in all modes while the auto light switch is turned on.
• The auto light switch turns off automatically whenever battery power drops to Level 3.
• The backlight may not light right away if you raise the watch to your face while a barometric pressure or altitude measurement operation is in progress.
• The auto light switch is always disabled, regardless of its on/off setting, when any one of the following conditions exists.
While an alarm is sounding
While a direction measurement operation is being performed or while a bearing sensor calibration operation in the Digital Compass Mode
To specify the illumination duration
1.In the Timekeeping Mode, hold down A until the seconds start to flash, which indicates the
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| 2. Press B to toggle the illumination duration |
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| setting between 2.5 seconds ( ) and 1.5 |
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| ll ll | l | seconds ( ). | |
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| l | l | 3. After the setting is the way you want, press A | |
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| l | to exit the setting screen. | |
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Questions & Answers
Question: What causes incorrect direction readings?
Answer:
•Incorrect bidirectional calibration. Perform bidirectional calibration.
•Nearby source of strong magnetism, such as a household appliance, a large steel bridge, a steel beam, overhead wires, etc., or an attempt to perform direction measurement on a train, boat, etc. Move away from large metal objects and try again. Note that digital compass operation cannot be performed inside a train, boat, etc.
Question: What causes different direction readings to produce different results at the same location ?
Answer: Magnetism generated by nearby
Question: Why am I having problems taking direction readings indoors ?
Answer: A TV, personal computer, speakers, or some other object is interfering with terrestrial magnetism readings. Move away from the object causing the interference or take the direction reading outdoors. Indoor direction readings are particularly difficult inside
Question: How does the barometer work?
Answer: Barometric pressure indicates changes in the atmosphere, and by monitoring these changes you can predict the weather with reasonable accuracy. Rising atmospheric pressure indicates good weather, while falling pressure indicates deteriorating weather conditions.
The barometric pressures that you see in the newspaper and on the TV weather report are measurements corrected to values measured at 0 m sea level.
Question: How does the altimeter work?
Answer: Generally, air pressure and temperature decrease as altitude increases. This watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization (ICAO). These values define relationships between altitude, air pressure, and temperature.
Altitude |
| Air Pressure | Temperature | |||||
4000 m |
| 616 hPa |
| About 8 hPa per 100 m |
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3500 m | 701 hPa |
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3000 m |
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| About 9 hPa per 100 m |
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| About 6.5°C | |||
2500 m |
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795 hPa |
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| 2°C |
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2000 m |
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1500 m | 899 hPa |
| About 11 hPa per 100 m | 8.5°C |
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1000 m |
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500 m | 1013 hPa |
| About 12 hPa per 100 m | 15°C |
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0 m |
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14000 ft | 19.03 inHg |
| 16.2°F |
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12000 ft |
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| About 0.15 inHg per 200 ft |
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10000 ft | 22.23 inHg |
| 30.5°F |
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8000 ft |
| About 0.17 inHg per 200 ft | About 3.6°F | |||
6000 ft | 25.84 inHg | About 0.192 inHg per 200 ft | 44.7°F | per 1000 ft | ||
4000 ft |
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2000 ft | 29.92 inHg | About 0.21 inHg per 200 ft | 59.0°F |
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0 ft |
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Source: International Civil Aviation Organization
•Note that the following conditions will prevent you from obtaining accurate readings:
When air pressure changes because of changes in the weather Extreme temperature changes
When the watch itself is subjected to strong impact
There are two standard methods of expressing altitude: Absolute altitude and relative altitude. Absolute altitude expresses an absolute height above sea level. Relative altitude expresses the difference between the height of two different places.
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| Height of building 130 m |
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| (relative altitude) |
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Sea
Precautions Concerning Simultaneous Measurement of Altitude and Temperature
Though you can perform altitude and temperature measurements at the same time, you should remember that each of these measurements requires different conditions for best results. With temperature measurement, it is best to remove the watch from your wrist in order to eliminate the effects of body heat. In the case of altitude measurement, on the other hand, it is better to leave the watch on your wrist, because doing so keeps the watch at a constant temperature, which contributes to more accurate altitude measurements.
The following describes what you should do to give priority to either altitude or temperature.
•To give altitude measurement priority, leave the watch on your wrist or in any other location where the temperature of the watch is kept constant.
•To give temperature measurement priority, remove the watch from your wrist and allow it to hang freely from your bag or in another location where it is not exposed to direct sunlight. Note that removing the watch from your wrist can momentarily affect pressure sensor readings.
Power Supply
This watch is equipped with a solar cell and a special rechargeable battery (secondary battery) that is charged by the electrical power produced by the solar cell. The illustration shown below shows how you should position the watch for charging.
Example: Orient the watch so its face is | Solar cell |
pointing at a light source. |
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• The illustration shows how to position a |
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watch with a resin band. |
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• Note that charging efficiency drops when |
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any part of the solar cell is blocked by |
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clothing, etc. |
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•Normally, you should try to keep the
watch outside of your sleeve as much as possible. Charging is significantly reduced if the face is only partially covered.
Important!
•Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is blocked from exposure to light can cause rechargeable battery power to run down. Be sure that the watch is normally exposed to bright light whenever possible.
•This watch uses a special rechargeable battery to store power produced by the solar cell, so regular battery replacement is not required. However, after very long use, the rechargeable battery may lose its ability to achieve a full charge. If you experience problems getting the special rechargeable battery to fully charge, contact your dealer or CASIO distributor about having it replaced.
•Never try to remove or replace the watch’s special battery yourself. Use of the wrong type of battery can damage the watch.
•All data stored in memory is deleted, and the current time and all other settings return to their initial factory defaults whenever battery power drops to Level 4 and when you have the battery replaced.
•Turn on the watch’s Power Saving function and keep it in an area normally exposed to bright light when storing it for long periods. This helps to keep the rechargeable battery from going dead.
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