Casio 5365 Operation Manual page 10

Reading the Barometric Pressure Graph
The barometric pressure graph shows a chronological history of pressure readings.
• The horizontal axis of the graph represents time, with each dot standing for
two hours. The rightmost dot represents the most recent reading.
Barometric Barometric
• The vertical axis of the graph represents barometric pressure, with each
pressure pressure
dot standing for the relative difference between its reading and that of the
dots next to it. Each dot represents 1 hPa.
Time Time
The following shows how to interpret the data that appears on the barometric pressure graph.
Rising barometric pressure indicates that upcoming weather will improve.
Falling barometric pressure indicates that upcoming weather will deteriorate.
Note
• If there are sudden changes in weather or temperature, the graph line of past reading
may run off the top or bottom of the display.
• The following conditions cause the barometric pressure reading to be skipped, with
the corresponding point on the barometric pressure graph being left blank.
– Barometric reading that is out of range (260 hPa to 1,100 hPa or 7.65 inHg to 32.45
inHg)
– Sensor malfunction
• The barometric pressure graph is not displayed while the barometric pressure change indicator is
displayed.
E-72
Reading Barometric Pressure Differential Pointer
Pressure differential is indicated in the
range of ±10 hPa (0.3 inHg), in 1-hPa (0.03
inHg) units.
• The nearby screen shot, for example,
shows what the second hand would
indicate when the calculated pressure
differential is approximately – 5 hPa
(approximately – 0.15 inHg).
• The second hand will point to (OVER)
or (UNDER) if the barometric
pressure 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.
• 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 (1 hPa 0.03 inHg).
E-74
Important!
• To ensure proper results, take barometric readings under conditions where the altitude remains
constant.
Example
– In a lodge or campground
– On the ocean
• A change in altitude causes a change in barometric pressure. Because of this, correct readings are
impossible. Do not take readings while ascending or descending a mountain, etc.
Enabling or Disabling Display of the Barometric Pressure Change Indicator
You can enable or disable display of the barometric pressure change indicator as desired. When display
of the indicator is enabled, the watch will take a barometric pressure reading every two minutes,
regardless of the mode it is in.
• When BARO is shown on the display, it means that barometric pressure change indicator display is
enabled.
• When BARO is not on the display, it means that barometric pressure change indicator display is
disabled.
To enable or disable the barometric pressure change indicator
In the Barometer Mode, hold down D for at least two seconds. Wait until INFO appears on the left side of
the display and the current setting (ON or OFF) fl ashes on the right. Use this screen to enable or disable
the barometric pressure change indicator.
• If barometric pressure change indicator display is currently enabled, BARO will also appear in the
upper display. BARO will not appear if display is currently disabled.
• Note that barometric pressure change indicator display will turn off automatically 24 hours after you
turn it on or battery power goes low.
E-76
To calibrate the pressure sensor
1. Take a reading with another measurement device to determine the
exact current barometric pressure.
2. Use B to enter the Barometer Mode (BARO), as shown on page
E-30.
3. Pull out the crown. This will cause the current barometric pressure
reading value to fl ash on the digital display.
• The timekeeping (hour, minute, second) hands will move to 2
o'clock.
4. Rotate the crown to adjust the barometric pressure value.
• You can also use HS1 high-speed movement (page E-5) to change
this setting.
• The calibration unit is 1 hPa (0.05 inHg).
• 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.
5. After you complete calibration, push the crown back in.
E-78
Operation Guide 5365
Current pressure Current pressure
greater than most greater than most
recent measured recent measured
inHg values inHg values
hPa values hPa values
Barometric Barometric
pressure pressure
differential differential
−5 −5
−10 −10
pointer pointer
−0.15 −0.15
−0.3 −0.3
Current pressure Current pressure
less than most less than most
recent measured recent measured
pressure pressure
Barometric Pressure Differential Pointer
Barometric Barometric
pressure pressure
differential differential
pointer pointer
To show and hide barometric pressure differential
1. Use B to enter the Barometer Mode (BARO), as shown on page E-30.
2. Press D.
Note
Press D to toggle the second hand between its two functions (indicating seconds or indicating the
•
barometric pressure differential).
Not visible on Not visible on
the display. the display.
Barometric Pressure Change Indications
Your watch analyzes past barometric pressure readings and uses a barometric pressure change indicator
to inform you about changes in pressure. If the watch detects a signifi cant change in barometric pressure,
it will beep and display a fl ashing arrow that indicates the direction of the pressure change. This means
pressure pressure
you could start taking barometric pressure readings after reaching a lodge or camp area, and then check
the watch the next morning for changes in pressure, and plan you day's activities accordingly. Note that
you can enable or disable display of the barometric pressure change indicator as desired.
The barometric pressure change indicator is displayed in the Barometer Mode and while the barometric
pressure graph is displayed in the Timekeeping Mode (page E-33).
Reading the Barometric Pressure Change Indicator
Indicator
• The barometric pressure change indicator is not displayed if there has been no noteworthy change in
barometric pressure.
• Note that time calibration signal reception and power saving (page E-18) are disabled while barometric
pressure change indicator display is enabled.
• Note that barometric pressure change indicator display cannot be enabled while the watch's battery is
low.
Pressure Sensor Calibration
The pressure 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 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.
Barometer 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.
This pointer indicates the relative difference between the most recent
barometric pressure reading indicated on the barometric pressure graph
(page E-71), and the current barometric pressure value displayed in the
Barometer Mode (page E-70).
Meaning
Sudden fall in pressure.
Sudden rise in pressure.
Sustained rise in pressure, changing to a fall.
Sustained fall in pressure, changing to a rise.
E-73
E-75
E-77
E-79