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Barometer/Thermometer Mode Second Hand Units
The second hand indicates barometric
pressure differentials up to ±10hPa (in
1-hPa units).
•
The nearby illustration, for example,
inHg values
inHg values
shows what the second hand would
indicate when the calculated differential
is approximately 5 hPa (approximately
0.15 inHg).
•
The second hand will point to OVER or
UNDER if the barometric pressure
differential is outside the allowable
range of the scale.
•
The second hand will move to 9 o'clock
if a sensor reading could not be taken
for some reason or if the reading is
outside the allowable range.
•
Barometric pressure is calculated and
displayed using hPa as the standard.
The barometric pressure differential
also can be read in inHg units as shown
in the illustration (1 hPa = 0.03 inHg).
E-48
To calibrate the pressure sensor and the temperature sensor
1. Take a reading with another measurement device to determine the
exact current barometric pressure or temperature.
2. With the watch in the Timekeeping Mode or in any of the sensor
modes, press B to enter the Barometer/Thermometer Mode.
3. Hold down E until each of the following steps occurs.
Hold SET appears on the digital display. ➝ The current temperature
•
value fl ashes.
4. Press D to move the fl ashing between the temperature value and
Press D.
Press D.
barometric pressure value, to select the one you want to calibrate.
5. Use A (+) and C (–) to adjust the calibration value in the units shown
below.
Temperature
Barometric Pressure
•
To return the currently fl ashing value to its initial factory default
setting, press A and C at the same time. OFF will appear at
the fl ashing location for about one second, followed by the initial
default value.
6. Press E to return to the Barometer/Thermometer Mode screen.
E-50
Taking Altitude Readings
The watch displays altitude values based on air pressure readings taken by a built-in pressure sensor.
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values (initial default method) or using a
reference altitude specifi ed by you.
When you measure altitude based on preset values
Data produced by the watch's barometric pressure sensor is converted to approximate altitude based on
ISA (International Standard Atmosphere) conversion values stored in watch memory.
When you measure altitude using a reference altitude specifi ed by you
After you specify a reference altitude, the watch uses that value to convert
barometric pressure readings to altitude (page E-62).
•
When mountain climbing, you can specify a reference altitude value in
accordance with a marker along the way or altitude information from a
map. After that, the altitude readings produced by the watch will be more
accurate than they would without a reference altitude value.
E-52
Reading the Altitude Graph
The altitude graph shows Altimeter Mode auto measurement readings over time.
•
The vertical axis of the graph represents altitude, and each dot stands
Latest
Latest
reading
reading
for 10 meters (40 feet).
•
The horizontal axis represents time. For the altitude readings taken
during the fi rst three minutes after you start an altimeter measurement
Altitude
Altitude
operation, each dot represents fi ve seconds. After that, each dot
represents two minutes (under initial default settings).
•
An out of range reading or a measurement error will cause the column
of dots for that reading to be blank (skipped).
Time
Time
Note
•
The measurement range for altitude is –700 to 10,000 meters (–2,300 to 32,800 feet).
•
The displayed altitude value changes to - - - - if an altitude reading falls outside the measurement
range. An altitude value will reappear as soon as the altitude reading is within the allowable range.
•
Normally, displayed altitude values are based on the watch's preset conversion values. You also can
specify a reference altitude value, if you want. See "Specifying a Reference Altitude Value" (page E-61).
•
You can change the unit for displayed altitude values to either meters (m) or feet (ft). See "To specify
temperature, barometric pressure, and altitude units" (page E-69).
E-54
Operation Guide 5114 5214
Current pressure
Current pressure
greater than most
greater than most
0.3
0.3
0.15
0.15
recent measured
recent measured
pressure
pressure
10
10
5
5
hPa values
hPa values
0
0
0
0
−10
−10
−5
−5
Current pressure
Current pressure
less than most
less than most
−0.3
−0.3
−0.15
−0.15
recent measured
recent measured
pressure
pressure
0.1 °C (0.2 °F)
1 hPa (0.05 inHg)
A
A
Pressure Sensor and Temperature Sensor Calibration
The pressure sensor and temperature sensor built into the watch are calibrated at the factory and normally
require no further adjustment. If you notice serious errors in the pressure readings and temperature
readings produced by the watch, you can calibrate a sensor to the reading of another device to correct the
errors.
Important!
•
Incorrectly calibrating the pressure sensor can result in incorrect readings. Before changing the
Second hand
Second hand
calibration value, make sure the readings you are using are reliable and accurate.
•
Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
– Compare the readings produced by the watch with those of another reliable and accurate thermometer.
– If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the
temperature of the watch time to stabilize.
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 offi cial 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 all moisture
from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual
surrounding temperature.
To take an altimeter reading
Altitude differential
Altitude differential
indicated by second hand
indicated by second hand
Current
Current
Altitude
Altitude
attitude
attitude
graph
graph
B
B
•
If you leave the watch in the Altimeter Mode, it will update the displayed altitude value regularly and
indicate reading-to-reading changes in graph form.
•
You can use the procedure under "Selecting an Altitude Auto Measurement Method" (page E-55) to
specify the altitude auto measurement method you want to use.
3. After you are fi nished using the Altimeter, press D to return to the Timekeeping Mode and stop auto
measurement.
•
The watch will return to the Timekeeping Mode automatically if you do not perform any operation for
about 10 hours after entering the Altimeter Mode (under initial default settings).
Selecting an Altitude Auto Measurement Method
You can select either of the following two altitude auto measurement methods.
0'05 1H : Readings at fi ve-second intervals for one hour
2'00 10H : Readings at fi ve-second intervals for the fi rst three minutes followed by two-minute
intervals for approximately 10 hours
Note
If you do not perform any button operation while in the Altimeter Mode, the watch will return to the
Timekeeping Mode automatically after 10 hours (altitude auto measurement method: 2'00 10H ) or after
one hour (altitude auto measurement method: 0'05 1H ).
To select the altitude auto measurement method
1. Make sure the watch is in the Timekeeping Mode or any one of the
sensor modes.
•
The sensor modes are: Compass Mode, Barometer/Thermometer
Mode, and Altimeter Mode.
2. Press A to start Altimeter measurement.
When you press A, the second hand will fi rst point in the direction of
•
the A (ALTI) button. This indicates the Altimeter Mode. After that,
the second hand will point at the current altitude differential.
•
ALTI will appear on the digital display, indicating that Altimeter
measurement is in progress. The fi rst reading will appear on the
digital display after about four or fi ve seconds.
•
The current altitude value is displayed in units of 5 meters (20 feet).
•
After the fi rst reading is obtained, the watch continues to take
altimeter readings automatically every fi ve seconds for the fi rst
three minutes, and then every two minutes after that (under initial
default settings).
1. In the Altimeter Mode, hold down E until each of the following steps
occurs.
Hold SET appears on the digital display. ➝ Hold SET disappears.
•
2. Press D to display the current altitude auto measurement method
setting.
•
This will cause either 0'05 or 2'00 to fl ash on the digital display.
3. Press A to toggle the altitude auto measurement method setting
between 0'05 1H and 2'00 10H .
4. Press E to exit the setting screen.
E-49
E-51
E-53
E-55
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