Servo motor step response

Hi,
I am using servo motor VTS08A.
I want to plot step response of this motor.
Can anyone please give me pointer to this problem??

Fix potentiometer to servo shaft
and measure with 2-ch memory oscilloscope

that was really useful.....
thank you!!!

but can you please explain me the waveform drawn in that image???

The control wire is used to communicate the angle.
The angle is determined by the duration of a pulse that is applied to the control wire.
This is called Pulse Coded Modulation. The servo expects to see a pulse every 20 milliseconds (.02 seconds).
The length of the pulse will determine how far the motor turns.
The control pulse width and repetition time can vary in different servo models.
A 1.5 millisecond pulse, for example, will make the motor turn to the 90 degree position (often called the neutral position).
If the pulse is shorter than 1.5 ms, then the motor will turn the shaft to closer to 0 degress.
If the pulse is longer than 1.5ms, the shaft turns closer to 180 degress.



Green pulses in picture : 1 pulse / 20ms

When pot.meter turns , voltage value shows turned angle .( red graph)



more about pulses & servos , read...
**broken link removed**

hi,

i tried the method you did mention in the previous post to plot step responce on DSO....
but i am not able to see the waveform on DSO...

can't we see the motor response waveform on DSO or or am i not able to use the DSO??
can u tell me how to calibrate motor(servo) response with DSO??

Make connections as shown in pict. post#2.
Make program to move or move manually servo continously back and forth.
Set scope x- and y-axis so that , you get desired curves for motion
Keep moving and store display

hi....
i am done with the step response of servo motor on DSO....
thanx a lot for your help and time!!!

now i want to study circuit mounted on the servo motor...like all feedback, comparison, and all manipulation circuits on it.
so can you please suggest me some readings for the same???