MicroStep-MIS MSB780X1D - Hqfe Set Altitude for QFE Corrected Pressure

MSB780(X) - User’s Guide
Table 14: Valid ranges for HQFE parameter
Valid ranges for HQFE parameter
Unit Minimum Maximum
m -30 30
ft -99 99
Example:
icaodigits<cr>
Actual setting: no truncate<cr><lf>
Insert max nr. of decimal digits [0..6 or off(means no truncate)]: 1<cr>
wait..OK<cr><lf>
6.44 “hqfe” Set altitude for QFE corrected pressure
Using this command you can set hqfe, which is height difference between the barometer eleva-
tion and official aerodrome elevation. The hqfe is calculated as the barometer elevation minus
official aerodrome elevation, it is a positive number in cases when the barometer is above the
aerodrome elevation.
Example:
hqfe<cr>
HQFE:<cr><lf>
Actual value 0.00 m<cr><lf>
Distance scale [ft, m]: m<cr>
Set altitude in m, ranges -30.00 .. 30.00 : 10<cr>
New altitude is: 10.00m<cr><lf>
wait..OK<cr><lf>
Available altitude units are m (meters), ft (feet).
Table of valid altitude ranges for different units is in table 6.5.
The corrected QFE pressure is computed using formula 9 or 10 if ICAO mode is turned on.
QF E = p ·

1 +
h
QF E
· g
R · T
QF E

(9)
where
p is adjusted output pressure in
h
QF E
is height difference between barometer elevation and official aerodrome elevation in m
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