Hot Servos

[falingtrea]

I see that servos have an input voltage range of 4.8VDC to 6VDC. If that power is not clean could it cause the jitter? Are servos ratiometric, so to speak?

[The Master]

The slight variations on my scope are background noise. We are talking like 2mV. Im pretty confident that the supply and signal are both cleaner than my scope is showing and theres no way i could get it any cleaner.

[Acetronics2]

I see that servos have an input voltage range of 4.8VDC to 6VDC. If that power is not clean could it cause the jitter? Are servos ratiometric, so to speak?

Hi, Tim

servos are Theoretically not supply sensitive , actually it is very, very, un noticeable.

This, Halas, is the new proof those hum... servos are to avoid ...

reducing the pause between two pulses only increases the energy given to hold the position ...
what confirms the steady position behaviour is very very bad ... see my #23 post ...

No other solution than select good ones instead of those ...

or try to modify the servo amp gain and dead band ( 10% success ... no more, and 90% risk of oscillating around the position.)

One certitude: amplifier parameters have not been optimised ( often seen for Hitech servos ... )

Alain

[The Master]

I think im going to try to avoid analog servos all together from now on. Digital servos seem to work way better.

Thanks for all your help anyway. I will get some new digital ones and see if i can return these.

[Acetronics2]

I think im going to try to avoid analog servos all together from now on. Digital servos seem to work way better.

Thanks for all your help anyway. I will get some new digital ones and see if i can return these.

Hi,

It's not a digital or analogic servos problem, but a quality problem ...
try to choose ones from well known brands ( Futaba, JR, Graupner ...) and of course, not the " first prices " ones , the price won't be so much higher ...

Chinese or Corean brands still are " no so reliable ", may be one day they'll become ... may be.

Alain