Sainlogic SC-07 User Manual page 16

the display console. If no operation is performed, the calibration mode will
timeout in 30 seconds.
1. Absolute Pressure Calibration
Press the SET/MODE key again to enter the pressure calibration mode.
Press the [+] or [-] key to increase or decrease the pressure reading (in
increments of 0.00 inHg))
2. Relative Pressure Calibration
In the calibration mode, press the SET/MODE button again, the "REL"
symbol will display at the pressure section, the relative pressure value will
flash. (The default value is 0.00 inHg)
Press the [+] or [-] key to increase or decrease the relative pressure value
(in increments of 0.01 inHg).
Press and hold the [+] or [-] for three seconds to increase or decrease
rapidly.
Press the ALARM key to reset current value.
Example: The calibrated pressure sources measure 25.00
inHg. The display console pressure reads 24.85 inHg.
Offset = 25.00 - 24.85 = 0.15 inHg
Note: 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 as 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 (1013.2hpa). This is the
average sea-level pressure around the world. Relative pressure
measurements greater than 29.92 inHg (1013.2hpa) are considered high
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