Ambient Weather WS-G3303THB Benutzerhandbuch - Seite 4

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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 (measured at your location) may read 28.62 inHg (969 mb) at an altitude

of 1000 feet (305 m), but the relative pressure (sea-level) 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.

5.4 Barometer Calibration

Your barometer will operate from -100 to 3,000 feet with reliable accuracy. Aneroid barometers have a

small screw on the back for sea-level calibration. With a flat blade screwdriver, turn this screw in

either direction slightly while looking at the indicator needle. It should move in one direction or the

other. Tap the barometer to see where the needle settles. Continue this procedure until the proper

pressure reading is obtained. Do not turn the screw counter-clockwise (to the left) too far, since the

screw can fall out. After the initial calibration, no further adjustment will be required unless the

barometer is moved to a new geographic location.

Figure 1

The dial thermometer uses a bimetallic strip wrapped into a coil. One end of the coil is fixed to the

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