Operation Guide 3070
About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on, whenever you position your wrist as described below in any mode.
Note that this watch features a “Full Auto EL Light”, so the auto light switch operates only when available light is below a certain level. It does not illuminate the display under bright light.
•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 During sensor measurement
While a bearing sensor calibration operation is being performed in the Digital Compass Mode
While a receive operation is in progress in the Receive Mode
Moving the watch to a position that is parallel to the ground and then tilting it towards you more than 40 degrees causes illumination to turn on.
•Wear the watch on the outside of your wrist.
Parallel to | More than | |
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40° |
Warning!
•Always make sure you are in a safe place whenever you are reading the display of the watch using the auto light switch. Be especially careful when running or engaged in any other activity that can result in accident or injury. Also take care that sudden illumination by the auto light switch does not startle or distract others around you.
•When you are wearing the watch, make sure that its auto light switch is turned off before riding on a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto light switch can create a distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down L for about three seconds to toggle the auto light switch on (A.EL displayed) and off (A.EL not displayed).
•The auto light switch on indicator (A.EL) 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 4.
•Illumination may not turn on right away if you raise the watch to your face while a barometric pressure or altitude measurement operation is in progress.
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 |
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| Temperature |
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| 4000 m |
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| 616 hPa | About 8 hPa per 100 m |
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| 3500 m |
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| 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 |
| 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 |
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| About 0.17 inHg per 200 ft | About 3.6°F |
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| 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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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.
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