SV-ADAHRS-200 Module Installation and Configuration
SkyView HDX System Installation Manual - Revision E 7-11
7.5 Other ADAHRS Calibrations
7.5.1 Altitude Offest
There is a single point altitude adjustment, located in SETUP MENU > HARDWARE
CALIBRATION > ADAHRS CALIBRATION > ALTITUDE OFFSET that adjusts SkyView’s
barometric altimeter. This adjustment affects both the displayed altitude and the encoded
altitude that is sent to other devices. It should only be adjusted if altitude is found to be
incorrect (by comparing it against a known source or field elevation, after the BARO
setting has been set to correctly to known atmospheric conditions) after SkyView has fully
warmed up.
7.5.2 Zero Pressure IAS / AoA Calibration
This calibration is located in SETUP MENU > HARDWARE CALIBRATION > ADAHRS
CALIBRATION > ZERO PRESSURE / AOA CALIBRATION.
NOTE: Perform this calibration even if airplane is not equipped with an AoA Probe to
properly set zero IAS.
This calibration routine samples Pitot, Static, and AOA pressures in a windless
environment to allow SkyView to provide the best possible Indicated Airspeed (IAS)
readings at very low airspeeds, and the best possible Angle of Attack (AOA). Ideally,
perform this calibration before performing an (in-air) AOA calibration. After performing
these two (2) steps, in the future, performing a ZERO PRESSURE IAS/AOA
CALIBRATION should restore both airspeed and AOA performance without requiring a
full AOA calibration.
It is important that this calibration is done in an absolutely windless environment, such as
a closed hangar. Additionally, before performing this calibration, cover the Pitot, Static,
and AOA ports with a sock or cloth to minimize airflow WITHOUT putting any air pressure
on the Pitot, Static, or AOA ports.
7.6 Pitot / Static Checks
Dynon Avionics SV-ADAHRS-200 use airspeed in the calculation of attitude (or GPS
ground speed when airspeed is unavailable). The internal rate sensors are monitored and
calibrated in flight using feedback from the accelerometers and from airspeed to achieve
a highly accurate attitude solution.
When a pitot or static test is performed the sensors in the SV-ADAHRS-200 are being
exposed to dynamics that are impossible to achieve in a real aircraft flight environment,
namely, large airspeed changes without the accompanying accelerations and rotations.
This false condition will cause a well-calibrated unit to incorrectly adjust its calibration.
Furthermore, when a unit is in a test situation a change in applied pitot or static pressure
will cause the attitude to pitch up or down. This is expected.
Performing the following pitot and static test procedure to a Dynon Avionics SV-ADAHRS-
200 will prevent problems with the unit’s performance in flight.
7.6.1.1 Test Instructions
• Ensure SkyView is warmed up during each test reading.
• SkyView should be powered off when changing pressures.
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