Icaoqnh mode for qnh and qfe – Vaisala PTB330 User Manual
Page 136
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USER'S GUIDE____________________________________________________________________
134 _________________________________________________________________ M210855EN-D
where:
p
=
measured air pressure [hPa]
h
HCP
=
height difference between the barometer and reference
level [m]
ICAOQNH Mode for QNH and QFE
190263
0
32
.
11880
77
.
44330
QFE
H
25588
5
15
.
288
0065
.
0
0
.
1
25
.
1013
QNH
h
H
QNH
NOTE
QNH and QFE values are rounded down to the next whole number in
ICAOQNH mode.
Table 33
Symbols used in QNH calculation formulas
Symbol Description
QNH
Resulting value of QNH in [hPa] (before any rounding).
QFE
Current value of QFE in [hPa].
h
QNH
HQNH setting (on page 80) in meters.
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