servo jitters

[jon-s]

Originally Posted by jon-s

When the servo jitters (I don't recall any sound), it moves back and forth, up to about 50 degrees.

Edit: Typo: the servo jitters about 5 degrees. The amount of jittering seems to vary.

[nitneylion452]

That changes things a lot. It is a very good possibility that your servo is defective and is fighting to get to its home position. Try a new servo, if the problem persists, increase the angle at which your signal wires cross others.

[jonboy]

Why not unplug the fuses/cktbkrs to all the high power items like the motors to help eliminate high current EMI and then check for servo jitter? Better yet just plug another servo into the same port on the DSC and chk for jitter.

[Al Skierkiewicz]

[R66]
A noise filter may be wired across motor leads or PWM leads. For the purposes of Inspection and rules compliance,such filters will not be considered custom circuits, and will not be considered a violation of Rule [R49] or Rule [R65].
Acceptable signal filters must be fully insulated and are:
A one microfarad (1 μF) or less non-polarized capacitor may be applied across the power leads of any motor on your Robot (as close to the actual motor leads as reasonably possible).
A resistor may be used as a shunt load for the PWM control signal feeding a servo.
It is not uncommon for servos to react to RF noise generated in the motors and motor wiring. It is best to run the PWM cables away from high current wiring and when it must cross, cross at right angles to minimize mutual coupling. the resistor lowers the impedance of the cable and generally, keeps the RF from overcoming the servo command signal.