Trio Avionics EZ Altitude Control - Manual (Page 19)

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SERVO
DBAND
6
c. Execute a turn at a bank angle of approximately 15 degrees. If the altitude sags
more than 30 feet after entering the turn the system gain needs to be
increased. Perform step d.
d. Increase the SYSTEM GAIN by 5 units, then repeat step c.
7.2 SERVO DEADBAND
The SERVO DEADBAND adjustment optimizes servo performance for your particular
installation. The “deadband” is an area in the servo rotation where drive signals are
momentarily nulled to prevent unnecessary hunting and / or oscillation of the servo
mechanism. The lowest setting that gives satisfactory performance is the optimum
setting. The factory setting is a nominal value which should give good performance in
most airplanes. However, to achieve best performance in your airplane the SERVO
DEADBAND adjustment should be optimized.
To optimize the servo deadband setting in your airplane perform the following
steps:
a. Enter
the ALTITUDE HOLD mode in smooth air
at your normal cruise speed after verifying the
pitch trim is properly adjusted for level flight.
b. Press
the ENCODER knob for more than 3
seconds until the SYSTEM GAIN setting is
displayed.
c. Press the ENCODER knob several more times until the SERVO DBAND
message is displayed
d. Decrease the deadband setting by slowly rotating the ENCODER knob
counterclockwise until jitter or bumping is experienced in the control stick.
e. Rotate the encoder clockwise until the jitter or bumping just stops. This is the
optimum gain setting for your installation.
NOTE – A SERVO DEADBAND setting of between 3 and 6 has proven to be optimum in
several aircraft used for flight evaluation. Your settings should be similar
NOTE: This gain setting is for smooth air tracking. If you enter turbulent conditions and the
altitude excursions are more than what you will accept, you may increase the gain (clockwise
rotation) to limit the altitude excursion. A setting of between 40 and 60 has been shown to
be optimum for most aircraft tested during flight evaluation. Your settings should be similar.