Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 73
Aeronautical Option
pressure converted to Altitude, CAS or Mach using BS 2G 199:1984
*
conversions and assuming
standard atmospheric conditions.
6.15.5 Reference Pressure
Select the required reference pressure, this can be either the barometric pressure (from the
instrument’s internal barometric sensor), or any numeric value (e.g.) 1013.25 mbar.
Figure 6-3: Q Code Visualization
6.15.6 Go to Ground
Returns the instrument and any UUT, connected to it, safely to ground pressure at a controlled
rate.
* Based on tables from ICAO Standard Atmosphere 1964.
Table 6-9: Airfield Task Q Codes
Q Code Description
QFE
Atmospheric pressure at sea level, corrected for temperature and
adjusted to airfield elevation. When set on the altimeter it reads
height.
QNE
Atmospheric pressure at Sea level in International Standard
Atmosphere (ISA) 1013.25
mbar.
QFF
Barometric pressure at a place, reduced to Mean Sea Level (MSL)
using the actual temperature at time of observation as mean
temperature.
QNH
Atmospheric pressure at Mean Sea Level (MSL) (may be local,
measured pressure or a Regional Forecast Pressure (RFP). When
set on altimeter it reads altitude.
1 Runway on Earth’s surface. 2 29.9212 inHg (1013.25 hPa) datum.
3 Sea level reference datum (adjusted).
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