Transient Response Calibration

Discussion in 'General Electronics Chat' started by Ryne Shelton, Feb 20, 2015.

  1. Ryne Shelton

    Thread Starter New Member

    Feb 20, 2015
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    I am responsible for calibrating the transient response for a DC Power Supply. I have no idea how to measure this. Any thoughts?
     
  2. MikeML

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    Oct 2, 2009
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    Use a big NFET to connect/disconnect a several amp resistive load to the power supply. Measure the step response of the PS as the NFET turns on/off.

    This illustrates the concept. Note how bad it is without a bypass cap on the output:

    12.gif
     
    Last edited: Feb 20, 2015
  3. Ryne Shelton

    Thread Starter New Member

    Feb 20, 2015
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    Okay, I'm not sure if we have any NFET's here in the lab. Any alternate methods that you can think of?
     
  4. MikeML

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    What kind of lab are in if you have no NFETs?

    How about a relay? It would likely have contact bounce on make, but should have a clean break.
     
  5. Ryne Shelton

    Thread Starter New Member

    Feb 20, 2015
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    I'm in a calibration lab. I'm also new to the lab so I'm not familiar with everything in it yet. Everyone else is gone.

    I'll look around and see what I can come up with. Thank you for the help.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    Even a toggle switch should work to connect and disconnect the load.
    The contact bounce on make should be tolerable for this test.
     
  7. MikeML

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    Would work if the calibration lab has a single-event recording oscilloscope or data acquisition system.
     
  8. Ryne Shelton

    Thread Starter New Member

    Feb 20, 2015
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    Thanks for the info guys. And yes, we do have single-event recording o'scopes. I'll try it on Monday when everyone is back in the lab and let you guys know how it goes. Have a good weekend.
     
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