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Thread: Using a multi meter to find out voltag regulation

  1. #11
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    Quote Originally Posted by ronss View Post
    this is the way i did it.....its easier to just buy the tester, its cheap

    https://www.wikihow.com/Check-a-Power-Supply
    That's not testing the PSU voltages while the PSU is loaded.

    Please see the OP's second post.

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    I got a cheap power supply load, but it gets way too hot way too soon.
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    Last edited by ashiekh; 01-13-2019 at 03:03 AM.

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    How would i go about testing the voltage ripple of the rails using a multi meter

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    Quote Originally Posted by faircomposer15 View Post
    How would i go about testing the voltage ripple of the rails using a multi meter
    You wouldn't. PSU reviewers use expensive, substantial equipment to measure ripple (the experts will correct any errors).
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    Why? Is it because it’s too inaccurate orrr? Just a beginner here

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    Quote Originally Posted by faircomposer15 View Post
    Why? Is it because it’s too inaccurate orrr? Just a beginner here
    A DMM, or any multimeter, measures voltage. DMM's measure hertz. Advanced DMM's measure current. I think you need an oscilloscope to measure ripple.
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    Quote Originally Posted by faircomposer15 View Post
    Well, go at it and have fun. I hope you will forgive me for not depending on any ripple measurements you get from a DMM.
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    Quote Originally Posted by faircomposer15 View Post
    With scope sure can.

    With DMM it's useless since you don't even know what waveform looks like and if measurement p-p would be some transient spike or actual pulsation (and what frequency). You get one number and that's it.

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    Quote Originally Posted by ashiekh View Post
    Be sure your meter is in voltage mode and not current.

    I have a meter that only does volts, to avoid my making the mistake.

    This guy illustrates
    https://www.bing.com/videos/search?q...5&&FORM=VRDGAR time 3:07
    Or get a meter that has an audible alert when you have probes in the wrong ports for voltage/current mode.

    The cheap Mastech/Centech Harbor Freight meter does this along with the BK precision 2709B if you want to get a really nice meter.

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