Operation Guide 2767
3
About Barometric and Temperature Measurements
•
Barometric pressure and temperature measurement operations are
performed as soon as you enter the Barometer/Thermometer Mode. After
that, barometric pressure and temperature measurements are taken every
five seconds for the first three minutes.
•
The indicator to the left of “BAROMETER” on the display flashes while a
measurement is in progress.
•
The barometer automatically takes measurements every three hours
(starting from midnight), regardless of what mode you are in. The results of
these measurements are used for plotting points on the barometric
pressure history graph.
•
You can also perform a barometric pressure and temperature measurement
at any time by pressing
B
in the Barometer/Thermometer Mode.
Barometer and Thermometer Precautions
•
The pressure sensor built into this watch measures changes in air
pressure, which you can then apply to your own weather predictions. It is
not intended for use as a precision instrument in official weather prediction
or reporting applications.
•
Sudden temperature changes can affect pressure sensor readings.
•
Temperature measurements are affected by your body temperature (while
you are wearing the watch), direct sunlight, and moisture. To achieve a
more accurate temperature measurement, remove the watch from your
wrist, place it in a well ventilated location out of direct sunlight, and wipe off
all moisture from the case. It takes approximately 20 to 30 minutes for the
case of the watch to reach the actual surrounding temperature.
•
You can select either hectopascals (hPa) or inchesHg (inHg) as the display
unit for the measured barometric pressure. See “Changing the Barometric
Pressure and Temperature Units” for details.
•
You can select either Celsius (
°
C) or Fahrenheit (
°
F) as the display unit for
the measured temperature value. See “Changing the Barometric Pressure
and Temperature Units” for details.
Altimeter
A built-in altimeter uses a pressure sensor to detect the current air pressure,
which is then used to estimate the current altitude. The watch is pre-
programmed with ISA (International Standard Atmosphere) preset values,
which are used to convert air pressure readings to altitude values. If you
preset a reference altitude, the watch will also calculate the current relative
altitude based on your preset value. Memory is also provided for the storage
of altimeter data.
Important!
•
This watch estimates altitude based on air pressure. This means that
altitude readings for the same location may vary if air pressure changes.
•
This watch employs a semiconductor pressure sensor, which is affected by
temperature changes. Make sure that the watch is not being exposed to
temperature changes while you are taking altitude measurements.
•
To avoid the effect of sudden temperature changes on measurement, wear
the watch so it is in direct contact with your wrist during measurement.
•
Do not rely upon this watch for altitude measurements or perform button
operations while engaging in sports where there are sudden altitude
changes, while sky diving, hang gliding, or paragliding, or while riding a
gyrocopter, glider, or any other aircraft.
•
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 flight crew.
How the Altimeter Works
With the Preset Values (No Reference Altitude)
•
The watch measures the air pressure at your current location and uses the
built-in ISA values to convert it to the equivalent altitude.
With a Reference Altitude
•
If you set a reference altitude, the watch
uses that value when calculating altitude
based on air pressure.
•
To determine the height of a tall building,
set the reference altitude to 0 on the
ground floor. Note, however, that you may
not be able to get a good reading if the
building is pressurized or air-conditioned.
•
When mountain climbing, you can set the
reference value in accordance with a
marker along the way or altitude
information from a map. After you do this,
the altitude readings produced by the
watch will be more accurate than they
would without a reference altitude.
400
B
A
To take an altitude reading
Pressing
E
in the Timekeeping Mode or in any
of the other sensor modes enters the Altimeter
Mode and automatically starts altitude
measurement.
•
It can take up to four or five seconds for the
altitude reading to appear after you enter the
Altimeter Mode.
•
The Altimeter Mode screen also displays the
current temperature. See “Barometer/
Thermometer” for more information.
•
During the first three minutes after entering the
Altimeter Mode, the indicator flashes on the
display and measurements are taken every five
seconds. After that, the indicator stops
flashing and remains on the display as
measurements are taken every two minutes.
lllllllll
Altitude
Temperature
Setting a Reference Altitude
After you set a reference altitude, the watch adjusts its air-pressure-to-altitude
conversion calculation accordingly. The altitude measurements produced by
this watch are subject to error caused by changes in air pressure. Because of
this, we recommend that you update the reference altitude whenever one is
available during your climb.
To set a reference altitude
1. In the Altimeter Mode, hold down
A
for about
two seconds until the watch beeps and the
display goes blank. About four or five seconds
after that,
OFF
or the current reference
altitude value (if set) will flash on the display.
•
If
OFF
or the current reference altitude
value does not appear at this time, press
A
to return to the Altimeter Mode screen, and
perform step 1 again.
2. Press
E
(+) or
B
(–) to change the current
reference altitude value by 5 meters (or 20 feet).
l l l l l
ll
ll
ll
ll
ll
ll
l l
Altitude Records
Storing altitude data in memory creates an altitude record. If a reading is
greater than all of the other altitude readings currently stored in memory, it is
stored in the maximum altitude record. The following describes the contents
of each type of record.
Recording date (year, month, day), time, and altitude: Up to 41 records
Maximum altitude (including recording date and time): 1 record
•
The maximum altitude record shows information about the altitude record
that has the greatest altitude value. The maximum altitude record is
updated any time a reading produces an altitude that is greater than that of
the current maximum altitude record.
•
Pressing
E
causes the measurement operation to restart from the
beginning of the cycle described above.
•
Altitude is displayed in units of 5 meters (20 feet).
•
The measurement range for altitude is –700 to 10,000 meters (–2,300 to
32,800 feet).
•
The measured altitude may be a negative value in cases where there is a
reference altitude value set or because of certain atmospheric conditions.
•
The displayed altitude value changes to
xxxxx
meters (or feet) if a
measured altitude falls outside the measurement range. The altitude value
will be displayed again as soon as the measured altitude is within the
allowable range.
•
You can change the unit of measurement for the displayed altitude values
between meters (m) and feet (ft). See “To change the altitude unit”.
•
You can set the reference altitude within the range of –10,000 to 10,000
meters (–32,800 to 32,800 feet).
•
Pressing
E
and
B
at the same time returns to
OFF
(no reference
altitude), so the watch performs air pressure to altitude conversions
based on preset data only.
3. Press
A
to exit the setting screen.
To store an altitude record in memory
In the Altimeter Mode, hold down
E
for about
one second until the watch beeps. This indicates
that a record of the altitude reading (date, time,
and altitude) has been stored in memory.
•
You can recall data in memory using the Data
Recall Mode.
•
Note that there is enough memory to store a
total of 41 records. If there are already 41
records in memory, storing another one
automatically deletes the oldest record to make
room for the new one.