Sea Level (Qff) Measurement; Sea Level Measurement - GE Druck DPI 740 User Manual

14
Sea Level (QFF) Measurement (Figure 3-4)
This mode measures the sea level pressure. It is the
meteorological presentation (QFF) of barometric pressure at
mean sea level and is a calculated value based on the local
height above sea level and the local air temperature.
Note:QNH is a derivative of QFF without a correction for local
air temperature.
Setting local height and temperature data
These correction factors are entered for a particular site and
remain stored in nonvolatile memory to correct the pressure
value when Sea (QFF) is selected. The two correction factors
are mean height above sea level in metres or feet (units
selected in altitude mode) and the local air temperature in °C.
tare
+ -
measurement mode -
pressing F1 steps to
PROCESS and SET_QFF menu
Figure 3-4 Sea level measurement
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DPI 740 User Manual
units of measurement
press F2 to change
between three units.