Ambient Weather WS-1171A Manuel de l'utilisateur - Page 9
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threshold setting. Press the + key or MIN/MAX key to adjust the storm threshold up or
down. Reference Section 4.5.4 for more details on this function.
4.2.1 Setting Barometric Pressure
Note: This is a continuation of the previous section. To enter this mode, you must start at the
beginning of this section.
The display console displays two different pressures: absolute (measured) and relative (corrected to
sea-level).
To compare pressure conditions from one location to another, meteorologists correct pressure to
sea-level conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected
pressure (the pressure your location would be at if located at sea-level) is generally higher than your
measured pressure.
Thus, your absolute pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but
the relative pressure is 30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). This is the average sea-level pressure
around the world.
Relative pressure measurements greater than 29.92 inHg (1013 mb) are
considered high pressure and relative pressure measurements less than 29.92 inHg are considered low
pressure.
To determine the relative pressure for your location, locate an official reporting station near you (the
internet is the best source for real time barometer conditions, such as Weather.com or
Wunderground.com), and set your weather station to match the official reporting station.
To change the relative pressure in the SET mode, press the
decrease the relative pressure setting to match the official reporting station.
4.2.2 Setting Calibrated Humidity
Note: This is a continuation of the previous section. To enter this mode, you must start at the
beginning of this section.
The display console allows you to calibrate both the indoor and outdoor humidity. Humidity is a
difficult parameter to measure accurately and drifts over time. The calibration feature allows you to
zero out this error.
To calibrate humidity, you will need an accurate source, such as a sling
psychrometer or Humidipaks One Step Calibration kit, available from Ambient Weather, which uses a
salt bath.
To calibrate indoor humidity, in the Set Mode with indoor humidity flashing, press the
MIN/MAX key to increase or decrease the humidity setting (in increments of 1%) to match the
calibrated or known humidity source. To return the indoor humidity to the measured value, press and
hold the SET key for 3 seconds and the humidity will return to the uncalibrated value.
Note: The remote (outdoor) thermo-hygrometer will always display the measured humidity level
and not the calibrated humidity level. Only the console will show the calibrated value.
Note: The dew point calculation is based on the calibrated humidity level.
Version 1.10
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key or MIN/MAX key to increase or
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