Operation Guide 3148
Questions & Answers
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 |
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| 4000 m |
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| 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 |
| About 6.5°C | ||||||
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| 2500 m |
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| 795 hPa |
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| 2°C |
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| 2000 m |
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| About 10 hPa per 100 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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| 14000 ft | 19.03 inHg |
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| 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 |
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| 30.5°F |
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| 8000 ft |
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| 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 | ||||||||
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| 2000 ft | 29.92 inHg | About 0.21 inHg per 200 ft | 59.0°F |
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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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| 230 m above sea level | |||||||||
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Sea Level
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.
•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 affect pressure sensor readings momentarily.
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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•You should try to keep the watch outside
of your sleeve as much as possible. Charging is reduced significantly if the face is covered only partially.
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 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 charge fully, 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 5 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.
Battery Power Indicator and Recover Indicator
The battery power indicator on the display shows you the current status of the rechargeable battery’s power.
| Level Battery Power Indicator | Function Status | |||||||||||
| 1 |
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| All functions enabled. |
| 2 |
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| All functions enabled. |
| 3 |
| l | l l | l | l l | l |
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| l | Illumination, beeper, and |
Battery power |
| ll |
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| ll | ll | lll | sensor operation disabled. | ||||
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indicator |
| l |
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| l | l |
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| l | l | l l | l | l l l |
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| (Charge Soon Alert) |
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| 4 |
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| l l |
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| Except for timekeeping and |
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| the C (charge) indicator, all | ||
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| ll |
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| lcll |
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| functions and display | |||
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| ll l |
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| indicators disabled. |
| 5 |
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| All functions disabled. |
• The flashing LOW indicator at Level 3 tells you that battery power is very low, and that exposure to bright light for charging is required as soon as possible.
• At Level 5, all functions are disabled and settings return to their initial factory defaults. Once the battery reaches Level 2 (indicated by M indicator) after falling to Level 5, reconfigure the current time, date, and other settings.
• Display indicators reappear as soon as the battery is charged from Level 5 to Level 2.
• Leaving the watch exposed to direct sunlight or some other very strong light source can cause the battery power indicator to show a reading temporarily that is higher than the actual battery level. The correct battery level should be indicated after a few minutes.
| • Performing multiple sensor, illumination, or |
| beeper operations during a short period may |
| cause LMH (recover) to appear on the display. |
| Illumination, alarm, countdown timer alarm, |
| hourly time signal, and sensor operations will |
| be disabled until battery power recovers. |
| After some time, battery power will recover and |
| LMH (recover) will disappear, indicating that |
Recover indicator | the above functions are enabled again. |
•Even if battery power is at Level 1 or Level 2, the Barometer/Thermometer Mode or Altimeter Mode sensor may be disabled if there is not enough voltage available to power it sufficiently. This is indicated by LMH (recover) on the display.
•If LMH (recover) appears frequently, it probably means that remaining battery power is low. Leave the watch in bright light to allow it to charge.
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