Operation Guide 5113 5213

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 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.

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 flashes.

Press D. 4. Press D to move the flashing between the temperature value and 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

0.1°C (0.2°F)

Barometric Pressure

1 hPa (0.05 inHg)

• To return the currently flashing value to its initial factory default setting, press A and C at the same time. OFF will appear at the flashing location for about one second, followed by the initial default value.

6. Press E to return to the Barometer/Thermometer Mode screen.

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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 all moisture from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding temperature.

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 specified 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 specified by you

After you specify a reference altitude, the watch uses that value to convert

 

barometric pressure readings to altitude (page E-53).

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• When mountain climbing, you can specify a reference altitude value in

accordance with a marker along the way or altitude information from a

A

map. After that, the altitude readings produced by the watch will be more

accurate than they would without a reference altitude value.

 

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To take an altimeter reading

Altitude differential indicated by second hand

Current Altitude

attitude graph

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 first 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 first reading will appear on the digital display after about four or five seconds.

•The current altitude value is displayed in units of 5 meters (20 feet).

•After the first reading is obtained, the watch continues to take altimeter readings automatically every five seconds for the first three minutes, and then every two minutes after that (under initial default settings).

Reading the Altitude Graph

The altitude graph shows Altimeter Mode auto measurement readings over time.

Latest

• The vertical axis of the graph represents altitude, and each dot stands

reading

 

 

 

for 10 meters (40 feet).

 

 

 

 

 

 

• The horizontal axis represents time. For the altitude readings taken

 

 

 

 

 

 

 

 

 

 

 

 

during the first three minutes after you start an altimeter measurement

 

 

 

 

 

 

 

 

 

 

 

Altitude

operation, each dot represents five 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

 

 

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-52).

•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-46) to specify the altitude auto measurement method you want to use.

3.After you are finished 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).

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• 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-60).

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Selecting an Altitude Auto Measurement Method

Using the Altitude Differential Value

You can select either of the following two altitude auto measurement methods. 0’05 1H: Readings at five-second intervals for one hour

2’00 10H: Readings at five-second intervals for the first 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. 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 flash 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.

Altitude differential indicated by second hand

In the Altimeter Mode, the part of the watch’s dial from 11 o’clock to 7 o’clock acts as an altitude differential scale. The second hand points to a place on the scale that indicates the difference between the altitude at a start point set by you and the altitude at your current location. The altitude differential indication is updated each time the watch takes an altitude reading.

You can configure the watch so each second mark in the altitude differential scale stands for 5 meters (20 feet) or 50 meters (200 feet). See “Configuring the Altitude Differential Scale” (page E-49) for information about how to configure this setting.

•The second hand will point to OVER or UNDER if the altitude 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.

•See “Using the Altitude Differential Value While Mountain Climbing or Hiking” (page E-51) for some real-life examples of how to use this feature.

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