MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 44
The basic device setup menu
Please note:
Airspeed calibration, Zero ASI/VSI and set altimeter calibration settings. Changing
these could result in your Stratomaster Ultra displaying incorrect readings. (Refer
calibration certificate).
Airspeed calibration
This function is used to calibrate the airspeed reading. It works in % relative to a nominal
value. Your calibration certificate will give you the setting required for correct reading if no
external airflow factors are present. In many aircraft installations it may be required to correct
the reading to cater for errors created by the airflow around your aircraft.
You can use the + and – keys to change the calibration factor.
An easy method to determine the amount of position error on your aircraft would be to wait
for a wind still day, set the Stratomaster Ultra to display TAS, equip your aircraft with a GPS
and take a flight. The ground speed as reflected by the GPS and the TAS as reflected by the
Stratomaster should agree if there is no position error. Any difference between these two
readings would be the position error.
It should be remembered that if you enter an incorrect adjustment here all airspeed readings
would reflect this error. It is thus important that the amount of error be determined accurately.
Examples:
Stratomaster Ultra under reading
TAS as indicated by Stratomaster Ultra
= 53 mph
Ground speed as indicated by GPS
= 55 mph
Difference
=
2
mph
