Ambient Weather WS-8400 사용자 설명서 - 페이지 10

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5.3.3 Adjusting Projector Focus

Adjust the focus of the projected data by rotating the focus knob on the projector.

5.3.4 Projector Temperature Display

The projector will scroll between the indoor and outdoor temperature. Each time you add an additional

channel sensor, the projector will add this sensor to the scroll feature. The scroll feature cannot be

disabled.

5.4 Barometric Pressure Display and Settings

5.4.1 Barometric Pressure Units of Measure

In normal time mode, press the BARO button to change barometric units of measure (hPa / inHg /

mmHg).

5.4.2 Absolute Pressure vs. Relative Pressure

Press and hold the BARO button for 2 seconds to enter barometric mode, and press the +/CHANNEL

button to switch between the relative and absolute pressure reading.

5.4.3 Relative Pressure Calibration

Please Reference Section 5.4.3.1 for details on the purpose of calibrating relative pressure, and how

to calibrate relative pressure in your area.

1. Press and hold the BARO button for 2 seconds to enter barometric mode. The icon BARO

will flash.

Make sure the REL Pressure is showing on the display. If ABS Pressure is showing, switch to

REL pressure per Section 5.4.2.

2. Press (do not hold) the BARO button again. The relative pressure will flash.

3. Press the +/CHANNEL to increase the relative pressure and -/MEM to decrease the relative

pressure.

4. Press (do not hold) the BARO button again to exit the relative pressure calibration mode, or

wait 60 seconds to time out.

Note: After calibration, the barograph will reset to 0 change (flat line across the graph).

5.4.3.1 Relative vs. Absolute Pressure and Calibration

The clock 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

relative pressure (the pressure your location would be at if located at sea-level) is generally higher

than your measured absolute 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).

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