To Take Barometric Pressure And Temperature Readings; Barometric Pressure Graph - Casio 3047 Operation Manual

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To take a direction reading
1. Enter the Digital Compass Mode.
Magnetic north pointer
2. Place the watch on a flat surface or, if you are
12 o'clock position
wearing the watch, make sure that your wrist
Direction
is horizontal (in relation to the horizon).
indicator
3. Point the 12 o'clock position of the watch in
the direction you want to measure.
4. Press A to start a Digital Compass
measurement operation.
• After about two seconds, the direction that the
12 o'clock position of the watch is pointing
appears on the display.
• Also, four pointers appear to indicate magnetic
Angle value (in degrees)
north, south, east, and west.
NW
• After the first reading is obtained, the watch
continues to take direction readings
automatically each second, for up to 20
seconds.
• During measurement, the watch displays an angle value, a direction
indicator, and four direction pointers, which change dynamically when the
watch is moved. After measurement is complete, the angle value,
direction indicator, and four direction pointers are frozen in accordance
with the last measurement.
Note
• Note that taking a measurement
while the watch is not horizontal
(in relation to the horizon) can
result in large measurement error.
• The margin of error for the angle value is ±11 degrees. If the indicated
direction is northwest (NW) and 315 degrees, for example, the actual
direction can be anywhere from 304 to 326 degrees.
• Any ongoing direction measurement operation is paused temporarily while
the watch is performing an alert operation (daily alarm, Hourly Time Signal,
countdown timer alarm) or while the watch illuminates the display (by
pressing L). The measurement operation resumes for its remaining
duration after the operation that caused it to pause is finished.
• The following table shows the meanings of each of the direction
abbreviations that appear on the display.
Direction Meaning
Direction
Meaning
North-
N
North
NNE
northeast
East-
E
East
ESE
southeast
South-
S
South
SSW
southwest
West-
W
West
WNW
northwest
• See "Digital Compass Precautions" for other important information about
taking direction readings.
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 temperature sensor and the pressure sensor if you
suspect that readings are incorrect.

To take barometric pressure and temperature readings

Pressing B in the Timekeeping or Digital Compass Mode enters the
Barometer/Thermometer Mode and starts taking barometric pressure and
temperature measurements automatically.
History Graph and
Barometric Pressure
Barometric
pressure
History graph
• 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).
• The displayed barometric pressure value changes to
a measured barometric pressure falls outside the range of 600 hPa to 1100
hPa (17.70 inHg to 32.45 inHg). The barometric pressure value will be
displayed again 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).
Operation Guide 3047
Direction
Meaning
Direction
Meaning
East-
NE
Northeast
ENE
northeast
South-
SE
Southeast
SSE
southeast
West-
SW
Southwest
WSW
southwest
North-
NW
Northwest
NNW
northwest
Temperature and
Barometric Pressure
Press E to
toggle between
screens.
Temperature
xxxx
hPa (or inHg) if
• The displayed temperature value changes to
measured temperature falls outside the range of –10.0°C to 60.0°C (14.0°F
to 140.0°F). The temperature value will be displayed again as soon as the
measured temperature is within the allowable range.
• In some areas, barometric pressure is expressed in millibars (mb) instead
of hecto-pascals (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 specify
barometric pressure and temperature units".
• See "Barometer and Thermometer Precautions" for important precautions.

Barometric Pressure Graph

Barometric pressure indicates changes in the atmosphere. By monitoring
these changes you can predict the weather with reasonable accuracy.
In every mode except for the Depth Gauge Mode, your watch takes barometric
pressure readings every two hours (at the top of each even-numbered hour).
Measurement results are used to produce barometric pressure graph and
barometric pressure differential pointer readings.
The barometric pressure graph shows readings of previous measurements for
up to 30 hours. The horizontal axis of the graph represents time, with each
dot standing for two hours. The rightmost dot (flashing) 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 (600 hPa/mb to 1,100 hPa/mb or
17.70 inHg to 32.45 inHg)
• Sensor malfunction
Barometric Pressure Differential Pointer
This pointer 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 ±15 hPa, in 1-hPa units.
• The barometric pressure differential pointer is not displayed when the
displayed current barometric value is outside of the allowable measurement
range (600 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.
Current pressure
greater than most
recent measured
pressure
Current pressure
less than most
recent measured
pressure
°C (or °F) if a
---
-
.
Not visible on
the display.
inHg values
hPa values
Barometric pressure
differential pointer
Points to 3 o'clock for
differentials outside
the range of ±15 hPa/
±0.44 inHg.
Pressure differential
examples in the
illustration are indicated
in 10 hPa/0.3 inHg
steps.
4

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