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    mvvsnmurthy's Avatar
    mvvsnmurthy Posts: 2, Reputation: 1
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    #1

    Jul 28, 2010, 08:17 PM
    How to measure % of ripples at output of a D.C charger
    How to measure % of ripples at output of a D.C charger
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Jul 28, 2010, 08:25 PM

    May help:
    http://www.eet-china.com/ARTICLES/20...BM_DA_AN05.PDF
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    Jul 29, 2010, 12:27 AM

    Chargers may be pulsating DC. An osciliscope is mandatory. Ripple may change with load.
    mvvsnmurthy's Avatar
    mvvsnmurthy Posts: 2, Reputation: 1
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    #4

    Jul 29, 2010, 01:39 AM
    Quote Originally Posted by KeepItSimpleStupid View Post
    Chargers may be pulsating DC. An osciliscope is mandatory. Ripple may change with load.
    Sir,

    Please suggest how to connect CRO and the procedure. We have CRO at our lab.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    Jul 29, 2010, 01:52 AM

    You might want to do the calibration of the 10X probe, but you don't strictly have to unless the ripple frequency is high.

    If you haven't done it before, there should be a calibration tab on the face of the scope. Adjust scope for a stable signal and adjust the small screw on the scope end of the cable until the waveform is flat.

    With the DC adapter, AC couple the adapter and find the p-p voltage and measure the DC voltage with a meter under known loads. Unfortunately, this gives peek to peek ripple and you can convert that to % ripple.

    There are meters which measure TRMS AC voltages and have selections for AC and AC+DC. That's a very easy way to measure RMS ripple.
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