Casio 2357 일반 매뉴얼 - 페이지 3

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Using the barometric pressure graph

Barometric pressure is affected by changes in weather and temperature. The

following shows how to interpret the data that appears on the barometric

pressure graph.

A rising graph generally means better weather.

A falling graph generally means deteriorating

weather.

Note that if there are sudden changes in weather or

temperature, the graph line of past measurements

may run off the top or bottom of the display. The

entire graph will become visible once barometric

pressure conditions stabilize.

The following conditions cause the barometric pressure measurement to be

skipped, with the corresponding point on the barometric pressure graph being

left blank.

• Barometric reading that is out of range (460 hPa/mb to 1100 hPa/mb/13.55

inHg to 32.45 inHg).

• Sensor malfunction.

• Dead battery.

Selecting the unit of measurement

1. Use C to enter the Barometer Mode.

2. Hold down A until "OFF" or the current barometric pressure value flashes

on the display.

3. Press C to change to the measurement unit selection screen.

4. Each press of D or B cycles the barometric pressure measurement unit

as shown below.

hPa

5. After you select the measurement unit you want, press A to return to the

Barometer Mode screen.

• Note that all measurement data currently in memory is also deleted

whenever you change the barometric pressure, altitude, or temperature unit

of measurement.

Calibrating the barometric pressure measurement

The sensor of this watch is calibrated at the factory before shipment, and

further adjustment is normally not required. If noticeable error is found in the

barometric pressure readings produced by the watch, you can adjust it to

correct the error.

Important!

Incorrectly calibrating the barometric pressure measurement of this watch can

result in incorrect readings. Compare the readings produced by the watch with

those of another reliable, accurate barometer.

Calibrating the barometric pressure

1. Use C to enter the Barometer Mode.

2. Hold down A until "OFF" or the current barometric pressure calibration

value flashes on the display.

• "OFF" appears when the factory setting is currently set as the current

barometric pressure calibration value.

3. Each press of D increases the displayed barometric pressure by 1 hPa/mb,

while pressing B decreases it. Holding down either button changes the

value at high speed.

• If inHg is currently selected as the unit of measurement, the above

operations change the reading by 0.05 inHg.

• Pressing B and D at the same time returns to the "OFF" setting.

4. After calibrating the barometric pressure, press A to return to the

Barometer Mode screen.

inHg

ALTIMETER MODE

A built-in altimeter uses a pressure sensor to detect the current barometric

pressure, which is then used to estimate the current altitude in accordance

with ISA (International Standard Atmosphere) values for altitude and

barometric pressure. If you preset a reference altitude, the watch will also

calculate the current relative altitude based on your preset value.

Important !

• This watch estimates altitude based on barometric pressure. This means

that altitude readings for the same location may vary if barometric pressure

changes.

• Sudden changes in the weather make it impossible to produce accurate

altitude readings.

• This watch employs a semiconductor pressure sensor, which is affected by

temperature changes. When taking altitude measurements, be sure to do

so while ensuring that the watch is not exposed to temperature changes.

• Do not use this watch while participating in sports where there are sudden

altitude changes. Also, do not use this watch for applications that demand

professional or industrial level precision. This watch should not be used

while engaging in the following activities: skydiving, hang gliding,

paragliding, gyrocopter riding, glider riding, etc.

Applications

When no reference altitude is preset:

• The watch produces approximate altitude readings.

When a reference altitude is preset:

• Before beginning the climb, set the reference altitude to 0 meter at the foot

of the mountain. This makes it possible to determine the difference in

altitude between the reference point and your destination.

• To determine the height of a tall building, set the reference altitude to 0

meter on the ground floor. Note that you

may not be able to get a good reading if

the building is pressurized or air-

conditioned.

• To determine the difference in altitude

between your house and another location, set the reference altitude to 0

meter at your house, and then check the reading when you arrive at the

other location.

• When mountain climbing, you can input

the altitude from a marker as your

reference altitude, which will then let you

know your altitude as your climb

proceeds. The following conditions will

prevent you from obtaining accurate

readings:

When barometric pressure changes because of changes in the weather

Extreme temperature changes

When the watch itself is subjected to strong impact

About altitude measurements

The watch measures altitude every five seconds for the first two minutes after

you enter the Altimeter Mode. The Altimeter Mode indicator 1 flashes on the

display during these two minutes.

After the first two minutes, the Altimeter Mode indicator 1 stops flashing, and

the watch automatically takes measurements every two minutes (on even

numbered minutes).

The display unit for Altimeter Mode measurements is 5 meters (20 feet), and

the display range is 0 to 6,000 meters (0 to 19,680 feet).

• The measured altitude may be a negative value in cases where there is a

reference altitude value set or because of certain barometric pressure

conditions.

Altimeter Mode

indicator 1

Remaining memory

Altimeter Mode indicator 2

2307/2335-3

400

Current altitude

Unit of measurement

5 seconds

later

1 50

Press A.

1 50

Altitude graph