Casio 2271 QUESTIONS & ANSWERS, REFERENCE, Auto Display Function, Warning Indicators, To turn the auto light switch on and off, To turn the Auto Display off

To turn the auto light switch on and off

In the Timekeeping, Digital Compass, Barometer/Thermometer, or Altimeter Mode, hold down C for about one second to toggle the auto light switch on

( displayed) or off ( not displayed).

•Pressing C while in the Timekeeping, Digital Compass, or Altimeter Mode initially switches to the Barometer/Thermometer Mode. Keeping C depressed toggles the auto light switch on or off.

• The auto light switch on indicator (	) is on the display in all modes
while the auto light switch is turned on.

•In order to protect against running down the batteries, the auto light switch automatically turns off approximately six hours after you turn it on. Repeat the above procedure to turn the auto light switch back on if you want.

QUESTIONS & ANSWERS

Question: What causes incorrect direction readings?

Answer:

•Incorrect bidirectional calibration. Perform bidirectional calibration. Remember that bidirectional calibration is required whenever batteries are replaced.

•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 high-tension wires are interfering with detection of terrestrial magnetism. Move away from the high- tension wires and try again.

Question: What does it mean when xxx appears in place of a direction ?

Answer: This is the abnormal magnetic field indicator. It means that strong magnetism is being generated nearby. Move away from the source of strong magnetism and try again.

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 taking direction readings are particularly difficult inside ferro-concrete structures. Remember that you will not be able to take direction readings inside of trains, airplanes, etc.

Question: What do the numbers on the watch mean?

Answer: The face of this watch is marked with values

	that increase in a counterclockwise direction.
	These values represent degrees. When you
	take a direction reading, you can use these
90	values to find out how many degrees the 12

o’clock position of this watch (which is the direction indicated in the digital display) differs from magnetic north.

For example, when the Magnetic North Pointer is pointing at “90” on the watch’s face, it means that the 12 o’clock position is 90 degrees from magnetic north (which means that the 12 o’clock pointing due east).

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/mb	About 8 hPa/mb per 100 m			–11°C
3500 m	701 hPa/mb				–4.5°C
3000 m		About 9 hPa/mb per 100 m				About 6.5°C
2500 m
	795 hPa/mb				2°C	per 1000 m
2000 m		About 10 hPa/mb per 100 m
1500 m	899 hPa/mb	About 11 hPa/mb per 100 m			8.5°C
1000 m
500 m	1013 hPa/mb	About 12 hPa/mb per 100 m			15°C
0 m
Source: International Civil Aviation Organization
14000 ft	19.03 inHg		16.2°F
12000 ft		About 0.15 inHg per 200 ft
10000 ft	22.23 inHg	About 0.17 inHg per 200 ft	30.5°F
8000 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
2000 ft	29.92 inHg	About 0.21 inHg per 200 ft	59.0°F
0 ft

Source: International Civil Aviation Organization

2271-6

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.

Height of building 130 m	Rooftop at an altitude of
	230 m above sea level
(Relative altitude)
	(Altitude above sea level)

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 require 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 hand 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.

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 deterioration 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: What should I do if I lose track of which mode I am in or lose my way when making settings?

Answer: Hold down D for about one second to return to the Timekeeping Mode. Next, try performing the operation you want again.

REFERENCE

This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.

Auto Display Function

Auto Display function of this watch continually changes the contents of the digital display. Note that you cannot use any of the watch’s other functions while the Auto Display function is operating.

To turn the Auto Display off

Hold down Dfor about three seconds until the watch beeps.

To turn the Auto Display on

In the Timekeeping Mode, hold down D for about three seconds until the watch beeps three times.

•Note that the Auto Display function cannot be performed while you are making settings.

Warning Indicators

Warning indicators appear whenever any of the conditions described below occur. Appearance of a warning indicator causes any measurement operation that is currently underway to stop. Warning indicators appear in the upper display area, and this causes xxx to replace any directional, temperature, barometer, or altitude values on the display.

Abnormal Magnetic Field Indicator

This indicator appears whenever the watch has a problem obtaining a correct direction reading. This condition could indicate that the watch is within a very high magnetic field, and so you should try moving to another location. Also, see “Digital Compass Precautions” for further information on conditions that cause errors.