Trio-avionics EZ Altitude Control Manuel d'utilisateur télécharger pdf (Page 19)

SERVO

DBAND

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.

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Trio-avionics EZ Altitude Control Manuel d'utilisateur Page 19