Handleiding Casio Pro Trek PRW-50YFE-2AER Horloge

Handleiding

E-71

Barometric Pressure Differential Pointer

This pointer indicates the relative difference between the most recent

barometric pressure reading indicated on the barometric pressure graph

(page E-69), and the current barometric pressure value displayed in the

Barometer Mode (page E-68).

To show and hide barometric pressure differential

1. Use

B

to enter the Barometer Mode (

BARO

), as shown on page E-30.

2. Press

D

.

Note

• Press

D

to toggle the second hand between its two functions (indicating seconds or indicating the

barometric pressure differential).

Barometric

pressure

differential

pointer

E-70

Reading the Barometric Pressure Graph

The barometric pressure graph shows a chronological history of pressure readings.

• The horizontal axis of the graph represents time, with each dot

standing for two hours. The rightmost dot represents the most recent

reading.

• The vertical axis of the graph represents barometric pressure, with

each dot standing for the relative difference between its reading and

that of the dots next to it. Each dot represents 1 hPa.

The following shows how to interpret the data that appears on the barometric pressure graph.

Rising barometric pressure indicates that upcoming weather will improve.

Falling barometric pressure indicates that upcoming weather will deteriorate.

Note

• If there are sudden changes in weather or temperature, the graph line of past reading

may run off the top or bottom of the display.

• The following conditions cause the barometric pressure reading to be skipped, with

the corresponding point on the barometric pressure graph being left blank.

– Barometric reading that is out of range (260 hPa to 1,100 hPa or 7.65 inHg to 32.45

inHg)

– Sensor malfunction

• The barometric pressure graph is not displayed while the barometric pressure change indicator is

displayed.

Barometric

pressure

Time

Not visible on

the display.

E-69

Barometric Pressure

• Barometric pressure is displayed in units of 1 hPa (or 0.05 inHg).

• The displayed barometric pressure value changes to

- - -

if a measured

barometric pressure falls outside the range of 260 hPa to 1,100 hPa

(7.65 inHg to 32.45 inHg). The barometric pressure value will reappear

as soon as the measured barometric pressure is within the allowable

range.

Display Units

You can select either hectopascals (hPa) or inchesHg (inHg) as the

display unit for the measured barometric pressure. See “To specify

altitude, barometric pressure, and temperature units” (page E-51).

Barometric Pressure Graph

Barometric pressure indicates changes in the atmosphere. By monitoring

these changes you can predict the weather with reasonable accuracy.

This watch takes barometric pressure reading automatically every two

hours. Readings are used to produce barometric pressure graph and

barometric pressure differential pointer readings.

Barometric pressure

change indicator

Barometric pressure

Barometric pressure graph

E-68

Taking Barometric Pressure Readings

This watch uses a pressure sensor to measure air pressure (barometric pressure).

To take barometric pressure readings

Use

B

to select the Barometer Mode (

BARO

), as shown on page E-30.

•

BARO

will appear on the display, indicating that barometric pressure

reading is in progress. The results will appear on the display after

about one second.

• After a barometric pressure reading operation is started, the watch will

take readings every fi ve seconds for the fi rst three minutes, and then

every two minutes after that.

• To restart a reading operation from the beginning, press

A

.

• The watch will return to the Timekeeping Mode automatically if you do

not perform any operation for about one hour after entering the

Barometer Mode.

Note

• When you press

B

above, the second hand may indicate seconds (of

the current time) or the barometric pressure differential (page E-71).

The initial second hand function will be the same as what was selected

the last time you took a barometric pressure reading. To toggle

between the two second hand functions (indicating seconds or

indicating the barometric pressure differential) press

D

.

Barometric

pressure graph

Barometric

pressure

E-67

Precautions Concerning Simultaneous Altitude and Temperature Readings

For the more accurate altitude readings, leaving the watch on your wrist is recommended in order to

maintain the watch at a constant temperature.

• When taking temperature readings, keep the watch at as stable a temperature as possible. Changes in

temperature can affect temperature readings. See product specifi cations (page E-107) for sensor accuracy

information.

E-66

Altimeter Precautions

• This watch estimates altitude based on air pressure. This means that altitude readings for the same

location may vary if air pressure changes.

• Do not use this watch for altitude reading or perform button operations while sky diving, hang gliding,

or paragliding, while riding a gyrocopter, glider, or any other aircraft, or while engaging in any other

activity where there is the chance of sudden altitude changes.

• Do not use this watch for measuring altitude in applications that demand professional or industrial level

precision.

• Remember that the air inside of a commercial aircraft is pressurized. Because of this, the readings

produced by this watch will not match the altitude readings announced or indicated by the fl ight crew.

E-65

How does the altimeter work?

Generally, air pressure decreases as altitude increases. This watch bases its altitude reading on

International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization

(ICAO). These values defi ne relationships between altitude and air pressure.

• 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, which expresses an absolute

height above sea level, and relative altitude, which expresses the difference between the altitudes of two

different places. This watch expresses altitudes as relative altitude.

Sea Level

Rooftop at an altitude of

230 m above sea level

(absolute altitude)

Height of building 130 m

(relative altitude)

Regular calibration of the watch in accordance with values provided by local altitude (elevation) indications

is recommended before taking readings in order to maximize reading accuracy (page E-55).

E-64

• Entering the Altimeter Mode starts a new altitude auto reading session, but it does not reset the current

ASC

and

DSC

values or change them in any way. This means that the starting

ASC

and

DSC

values for

a new Altimeter Mode auto reading session are the values that currently are in memory. Each time you

complete an altitude auto reading session by exiting the Altimeter Mode, the total ascent value of the

current session (920 meters in the above example) is added to the session’s starting

ASC

value. Also,

the total descent value of the current auto reading session (–820 meters in the above example) is

added to the session’s starting

DSC

value.

Note

• The high altitude, low altitude, total ascent, and total descent values are retained in memory when you

exit the Altimeter Mode. To clear values, perform the procedure under “To delete a specifi c record”

(page E-83).

Operation Guide 5620

Meer over deze handleiding

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