Testing Servo Current

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  • toppack
    Rear Admiral
    • Nov 2008
    • 1124

    #1

    Testing Servo Current

    Many years ago I built a simple Servo Tester.
    Recently I had purchased 24 used servos from eBay.
    So thought it was time to test them, to be used in future projects. (May need to replace some in the T-class which seem to be drawing too much current, when no movement)
    Even tho they are all similar in physical size there's a big difference the amount of Current draw. So instead of looking up the rated torque and current, I just separated them by the amount of current drain, in full arc movement, with no load.
    Then when I need some I'll go for the low current ones first and then determine if they actually have enough torque to do the job.
    Since the rated torque and current are usually not what you actually get.

    BTW- None of them were completely shot! :)
    Last edited by toppack; 05-21-2009, 11:24 AM.
    Rick L.
    --------------------------------------------
    * Asking Questions is a 'Good Thing',
    Since Learning is Always a 'Good Thing' *
  • toppack
    Rear Admiral
    • Nov 2008
    • 1124

    #2
    If anyone is interested in building one, this is the schematic of the servo-tester:
    It uses a 555 timer IC, pot. P-1 has a knob on it that adjust thru the full servo travel.
    Current meter on power-supply is used to monitor the amount of current required by servo, or a multimeter in series could be used. Using a battery is not recomended, since it's not constant enough. The 555 circuit itself only draws about 5.milli-amps, which would be subtracted from total current.
    Click Pic:
    Attached Files
    Last edited by toppack; 05-21-2009, 12:49 PM.
    Rick L.
    --------------------------------------------
    * Asking Questions is a 'Good Thing',
    Since Learning is Always a 'Good Thing' *

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