Servo pulse train?

[sp1nm0nkey]

What's consitered the standard pulse width for a servo from 100% to 100% ATV? How about the pulse width with full ATV (full ATV is 120% to 120% or something). What about with full trims? Also, how does the pulse to a standard servo differ from the pulses to a super servo (9251, 9253, 9254, 9256)? How could this pulse train damage a standard servo?

I'd figure this out myself, but my oscilloscope has a busted deflector transistor.

Thanks for the help,
Evan

[vintage1]

full range is generally reckoned to be 1-2ms
1.5ms is neutral.

I am not sure what a super servo is.

[imeins]

I guess you are talking about the Futaba digital servos, S-9251 etc. I thought that the difference is in the way the digitals interpret a standard pulse train to provide better control of the servo motor. This from my slim knowledge of digital servos suggests there IS no difference. Unless, for example the output of a digital servo designed gyro sends updates at a greater rate than the standard 20mS intervals which may upset a standard servo because of the rate at which it is trying to update it's position, motor duty cycle times etc.

Maybe ATV 120% extends the range from .8 to 2.4mS pulse lengths ? Would completely depend on the encoder (tx) manufacturer unless there is a spec for this.


Ingmar

[ZAGNUT]

there is no standard: http://www.rcgroups.com/forums/showpost.php?p=4661797&postcount=8



dave

[pmackenzie]

From the GY401 (http://www.futaba-rc.com/manuals/futm0807-manual.pdf) manual:

•DS switch setting precaution
When the DS switch is set to the ON position, the rudder servo is driven by
approximately 270Hz high-speed pulses. This mode is for use with Futaba
digital servos only.
The "standard" frame rate is about 50 hz.
Based in this it seems like the Futaba signal would be the same 1-2msec pulse width with a frame rate of less than 4 msec.
( IIRC Futaba uses 1.52 msec as neutral, but the difference is small)
Pat MacKenzie