Barometer/Thermometer - Casio 3147 Operation Manual

To view altitude records and the current Altimeter Mode stopwatch
session record
Altitude records
E
E E
REC ( 1 ) REC ( 2 ) REC ( 20 )
B B
B
C
1. Enter the Data Recall Mode.
2. Use the C button to cycle between the altitude records, current Altimeter
Mode stopwatch record, and the historical record.
3. When the record you want is displayed, use the E (+) button and B (–)
button to scroll through the data. Holding down the E or B button scrolls
data at high speed.
4. After you are finished viewing data, press D to exit the Data Recall Mode.
• Dashes (
xxxx ) will be displayed if data has been deleted or if there is no
corresponding data due to error, etc. In such cases, total ascent (
DSC
and total descent ( ) values will show zero.
• When total ascent (
ASC ) or total descent (
(or 99,980 feet), the applicable value will restart from zero.
Clearing the Historical Record
Use the following procedure to clear the contents of the historical record and
restart all values from zero.
To clear the historical record
1. Press the D button to enter the Data Recall
Mode.
2. Hold down A.
•
CLR
display.
3. Keep A held down for an additional two
seconds until
• The historical record high altitude screen will
reappear when data deletion is complete.
• If you release the A button part way through
the above procedure, the watch will return to
the historical record high altitude screen
without deleting the data.

Barometer/Thermometer

This watch uses a pressure sensor to measure air pressure (barometric
pressure) and a temperature sensor to measure temperature.
• You can calibrate the pressure sensor and the temperature sensor if you
suspect that readings are incorrect.
To take barometric pressure and temperature readings
In the Timekeeping Mode, press the D button to
Barometric
Barometric
pressure
enter the Barometer/Thermometer Mode. This
pressure
graph
will start barometric pressure and temperature
measurements automatically.
• It can take up to four or five seconds for the
barometric pressure reading to appear after
you enter the Barometer/Thermometer Mode.
• Barometric pressure is displayed in units of
1hPa (or 0.05 inHg).
Temperature
• The displayed barometric pressure value changes to
a measured barometric pressure falls outside the range of 260 hPa to
1100 hPa (7.65 inHg to 32.45 inHg). The barometric pressure value will
reappear as soon as the measured barometric pressure is within the
allowable range.
• Temperature is displayed in units of 0.1°C (or 0.2°F).
• The displayed temperature value changes to
temperature falls outside the range of –10.0°C to 60.0°C (14.0°F to
140.0°F). The temperature value will reappear as soon as the measured
temperature is within the allowable range.
• In some areas, barometric pressure is expressed in millibars (mb) instead
of hectopascals (hPa). It really makes no difference, because 1hPa = 1mb.
• You can select either hectopascals (hPa) or inchesHg (inHg) as the display
unit for the measured barometric pressure, and Celsius (°C) or Fahrenheit
(°F) as the display unit for the measured temperature value. See "To select
the temperature, barometric pressure, and altitude units".
• See "Barometer and Thermometer Precautions" for important precautions.
Operation Guide 3147
Current stopwatch session record
E
E E E
C
MAX MIN ASC
DSC
B B B
B
C
Historical record
E
E E E
MAX MIN ASC DSC
B B B
B
ASC
DSC ) exceeds 99,995 meters
will appear in the upper part of the
CLR
starts flashing.
hPa (or inHg) if
xxxx
°C (or °F) if a measured
xxx
Barometric Pressure Graph
Barometric pressure indicates changes in the atmosphere. By monitoring
these changes you can predict the weather with reasonable accuracy.
This watch takes barometric pressure measurements automatically every two
hours (at the top of each even-numbered hour), regardless of its current
mode. Measurement results are used to produce barometric pressure graph
and barometric pressure change indicator readings.
The barometric pressure graph shows readings of previous measurements for
up to 24 hours. The horizontal axis of the graph represents time, with each dot
standing for two hours. The rightmost dot represents the most recent reading.
The vertical axis of the graph represents barometric pressure, with each dot
standing for the relative difference between its reading and that of the dots
next to it. Each dot represents 1hPa.
The following shows how to interpret the data that appears on the barometric
pressure graph.
A rising graph generally means improving weather.
A falling graph generally means deteriorating weather.
Note that if there are sudden changes in weather or
temperature, the graph line of past measurements may run
off the top or bottom of the display. The entire graph will
become visible once barometric conditions stabilize.
)
The following conditions cause the barometric pressure
measurement to be skipped, with the corresponding point on
the barometric pressure graph being left blank.
• Barometric reading that is out of range (260 hPa/mb to 1,100 hPa/mb or
7.65 inHg to 32.45 inHg)
• Sensor malfunction
Barometric Pressure Change Indicator
Barometric pressure graph
In the Barometer/Thermometer Mode, press the A button to toggle between
the barometric pressure graph and the barometric pressure change indicator.
This indicator ( ) indicates the relative difference between the most recent
barometric pressure reading indicated on the barometric pressure graph, and
the current barometric pressure value displayed in the Barometer/
Thermometer Mode.
• Pressure differential is indicated in the range of ±4 hPa, in 1-hPa units.
• The barometric pressure change indicator (
displayed current barometric value is outside of the allowable measurement
range (260 to 1,100 hPa).
• 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.
Barometric pressure
change indicator
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.
• During barometric pressure measurements, the watch may not be able to
update its timekeeping display contents normally. Correct timekeeping is
maintained internally, however.
Not visible on
the display.
Barometric pressure
change indicator
A
A
) is not displayed when the
or
More than +4hPa
+3hPa
+2hPa
+1hPa
±0hPa
–1hPa
–2hPa
–3hPa
Less than –4hPa
6