Trio Avionics EZ Altitude Control - Manual (Page 26)

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BARO
SET
2460
Once the setting is correct, press the LCD switch to put the system in the
READY mode. The system is now calibrated and ready to use.
If the system is cycled in flight, it will sense
airspeed and the message will read as shown to
the right (now indicating altitude instead of
elevation). The aircraft should be level (not
climbing or descending) so that the aircraft
altimeter needles are not moving. The initial
altitude will be close to that shown by the aircraft
altimeter. Here again, any differences will be the
result of barometer changes since the last time it was set.
The ALT SET may be changed by rotating the encoder until the indicated altitude
agrees with the aircraft altimeter. The display resolution is in 20 foot increments
for the ALT SET function. In normal flight, unless remarkable barometric
changes have been experienced, the ALT SET should agree with the current
altimeter indication.
9.1.2 EZ-3 Menu System
Because of the many additional functions in the EZ-3, a review of the
menu system will be helpful in explaining the operation of the system.
The diagram on the following page illustrates the use of the encoder
switch and LCD switch…..
Note: The mechanical aircraft altimeter is subject to small errors at different
altitudes. It should be kept calibrated according to FAA guidelines. The EZ-3
contains an accurate model of the atmosphere but it, too, may exhibit small
errors attributed to normal manufacturing tolerances of the precision sensors.
Such accumulated errors between the two systems will typically be less than
1%. During rapid climbs and descents it may also be observed that the
mechanical altimeter “lags” the EZ-3 altimeter ALT SET due to the faster
response of the solid state sensors.