Altitude Reading Precautions; Barometric Pressure And Temperature Measurement; Checking The Current Barometric Pressure And Temperature - Casio 3452 Operation Manual

Altitude Reading
Precautions
Effects of Temperature
When taking altitude readings, take the steps
below to keep the watch at as stable a
temperature as possible. Changes in
temperature can affect altitude readings.
Take readings with the watch on your wrist.
●
Take readings in an area where
●
temperature is stable.
Altitude Readings
Do not use this watch while skydiving, hang
●
gliding, paragliding, gyrocopter flying, glider
flying, or engaged in other activities where
altitude changes suddenly.
Altitude readings produced by this watch
●
are not intended for special-purpose or
industrial level use.
In an aircraft, the watch measures the in-
●
cabin pressurized air pressure, so readings
will not match altitudes announced by the
crew.
Altitude Readings (Relative Altitude)
This watch uses International Standard
Atmosphere (ISA) relative altitude data
defined by the International Civil Aviation
Organization (ICAO). Barometric pressure
generally becomes lower as altitude
increases.
Correct measurement may not be possible
under the conditions below.
During unstable atmospheric conditions
●
During sudden temperature changes
●
After the watch has been subjected to
●
strong impact
Measured Altitude Value Adjustment
Using GPS Signal Data
When using navigation while receiving GPS
signals, measured altimeter values are
automatically adjusted in accordance with
GPS signal data. Note, however, that this may
result in some difference between the
measured value and the actual altitude. Also
note that the measured altitude value
adjustment operation using GPS signal data
may take a few minutes. The adjustment
operation may take even longer, depending
on your current environment. Regular manual
adjustment of the measured altitude value
using locally available information is
recommended. The watch will not use GPS
signal data to adjust measured altitude values
for one hour after you adjustment the
measured altitude value manually.
Operation Guide 3452
Barometric Pressure
and Temperature
Measurement
You can use the watch to take barometric
pressure and temperature readings for your
current location.
Important!
Check the information below to find out
●
how to ensure correct readings.
Barometric Pressure and
l
Temperature Reading Precautions
Getting ready
Enter the Barometer/Temperature Mode.
Navigating Between Modes
l
Changing Displayed Information
l
Entering the Barometer/Temperature Mode
●
starts measurement operations.
Checking the Current
Barometric Pressure and
Temperature
Entering the Barometer/Temperature Mode
displays the current barometric pressure and
temperature. After you enter the Barometer/
Temperature Mode, the watch takes readings
about every five seconds for three minutes.
After that, a measurement is taken about
every two minutes.
Value Screen
Temperature
Barometric pressure
Barometric Pressure Graph Screen
The graph shows barometric readings taken
every two hours. You can use the graph to
view changes in barometric pressure over the
past 48 hours, which can be used to predict
upcoming weather.
Barometric pressure graph
Barometric pressure
Temperature
A trend
Indicates this:
like this:
Rising barometric pressure,
which indicates that upcoming
weather probably will be fair.
Falling barometric pressure,
which indicates that upcoming
weather probably will be bad.
Note
To retrigger measurement, press (D).
●
The watch will automatically return to
●
the Timekeeping Mode if you do not
perform any operation in the
Barometer/Temperature Mode for
about one hour.
Measurement ranges are shown
●
below. [- - -] will appear for the
measured value if it is outside the
allowable range.
Barometric pressure measurement:
260 hPa to 1,100 hPa (7.65 inHg to
32.45 inHg)
Thermometer measurement: -10.0°C
to 60.0°C (14.0°F to 140.0°F)
Large changes in barometric pressure
●
and/or temperature can cause past
data readings to be plotted outside of
the visible area of the graph. Though
plots are not visible, the data is still
maintained in watch memory.
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