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Using The Altimeter Mode; To Calibrate The Pressure Sensor And The Temperature Sensor - Casio 3443 Operation Manual

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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 the sensor to correct the errors.
Important!
Incorrectly calibrating the barometric pressure sensor can result in incorrect readings. Before
performing the calibration procedure, compare the readings produced by the watch with those of
another reliable and accurate barometer.
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.
E-48
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. Because of this, there may be
some error in the readings produced by the watch.
Temperature reading are affected by your body temperature, direct sunlight, and moisture. To achieve
a more accurate temperature reading, 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 surrounding temperature.
E-50
Altitude tendency graph contents are updated each time you take an altitude reading.
Graph units are 10 meters on the vertical axis, and the measurement reading interval (one second, fi ve
seconds, or two minutes) on the horizontal axis (page E-53).
To take readings of the difference between the altitude at your current location and the altitude at a
reference point, select Screen 2. See "Using an Altitude Differential Value" (page E-57) for more
information.
To select the altitude screen format
1. In the Altimeter Mode, hold down E for at least two seconds.
SET Hold will fl ash on the display and then ALTI will appear in the upper display. Keep E
depressed until ALTI appears.
The current altitude value will appear at this time.
2. Press D twice.
DISP will appear, and then the current screen setting will appear in the upper display.
3. Use A to toggle the setting between the two screens.
Screen 1
4. Press E to exit the setting screen.
E-52
Taking Altitude Readings
Use the procedure below to take basic altitude readings.
See "Using Reference Altitude Values" (page E-56) for information about how to make altimeter
readings more accurate.
See "How does the altimeter work?" (page E-65) for information about how the watch measures altitude.
E-54
Operation Guide 3443
Screen 2

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 for at least two seconds. SET Hold will fl ash on the
display and then TEMP will appear in the upper display. Keep E
depressed until TEMP appears.
The current temperature calibration setting will fl ash in the lower
display at this time.
4. Press D to move the fl ashing between the temperature value and
barometric pressure value, to select the one you want to calibrate.
5. Use A (+) and C (–) to select the temperature and barometric
pressure value display units as 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.

Using the Altimeter Mode

The watch takes altitude readings and displays results based on air pressure measurements taken by a
built-in pressure sensor. It also saves various types of altitude records and data.
Important!
See "To specify a reference altitude value" (page E-56) and "Altimeter Precautions" (page E-66) for
information about how to minimize differences between readings produced by the watch and values
provided by local altitude (elevation) indications.
Getting Ready
Before actually taking an altitude reading you need to select an altitude screen format and select an
altitude reading interval.
Selecting the Altitude Screen Format
You can select either of two screen formats for the Altimeter Mode.
Screen 1
Altitude
Tendency Graph
Altitude
Current time
Selecting the Altitude Auto Reading Interval
You can select either of the following two altitude auto reading interval.
0'05: Readings at one-second intervals for the fi rst three minutes, and then every fi ve seconds for
approximately the next hour
2'00: Readings at one-second intervals for the fi rst three minutes, and then every two minutes for
approximately the next 12 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 12 hours (altitude auto reading interval: 2'00) or after one
hour (altitude auto reading interval: 0'05).
If trek log operation is in progress with 0'05 selected as the altitude auto measurement method,
exiting the Altimeter Mode to another mode will automatically cause the auto reading interval to
change to 2'00.
To select the altitude auto reading interval
1. In the Altimeter Mode, hold down E for at least two seconds. SET
Hold will fl ash on the display and then ALTI will appear in the upper
display. Keep E depressed until ALTI appears.
The current altitude reading value will appear at this time.
2. Press D to display the current altitude auto reading interval setting.
This will cause INTERVAL to scroll across the top display. The
current altitude auto reading interval setting (0'05 or 2'00) will be
fl ashing in the center display.
3. Press A to toggle the altitude auto measurement interval setting
between 0'05 and 2'00.
4. Press E to exit the setting screen.
To take altitude readings
1. Make sure the watch is in the Timekeeping Mode or any one of the
Screen 1 Selected
Screen 1 Selected
sensor modes.
Altitude Tendency Graph
Altitude Tendency Graph
The sensor modes are: Digital Compass Mode, Barometer/
Thermometer Mode, and Altimeter Mode.
2. Press A to start auto altimeter readings.
The current altitude value is displayed in units of 1 meter (5 feet).
For information about the measurement interval, see page E-53.
Altitude
Altitude
Note
After you are fi nished, press D to return to the Timekeeping Mode and
stop auto altimeter readings.
Current time
Current time
The watch will return to the Timekeeping Mode automatically if you do
not perform any operation (page E-18).
Screen 2 Selected
Screen 2 Selected
The measurement range for altitude is –700 to 10,000 meters (–2,300
to 32,800 feet).
Relative altitude
Relative altitude
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 "Using Reference Altitude Values" (page E-56).
Altitude
Altitude
You can change the unit for displayed altitude values to either meters
(m) or feet (ft). See "To specify temperature, barometric pressure, and
altitude display units" (page E-40).
Current time
Current time
0.1°C (0.2°F)
1 hPa (0.05 inHg)
E-49
Screen 2
Relative altitude
Altitude
Current time
E-51
E-53
E-55

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