how to measure hight tension ?

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  • jasko_jacker
    Badcaps Legend
    • Oct 2014
    • 1137
    • italy

    #1

    how to measure hight tension ?

    Hi,
    I should measure a voltage >300 v at 40 KHz, I know that the cheap tester can measure voltage only around 50-60 Hz, I have an oscilloscope but not HT probe. there is a solution to have a good measure ?
    thanks
    Last edited by jasko_jacker; 03-09-2017, 07:41 AM.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: how to measure hight tension ?

    How about building Voltage divider circuit? Is the circuit in the hot side?
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

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    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • jasko_jacker
      Badcaps Legend
      • Oct 2014
      • 1137
      • italy

      #3
      Re: how to measure hight tension ?

      I try with this circuit
      https://www.repairfaq.org/sam/hvprobe.htm
      but I don't know if a spike can damage the oscilloscope

      Comment

      • PeteS in CA
        Badcaps Legend
        • Aug 2005
        • 3576
        • USA, Unsure of Planet

        #4
        Re: how to measure hight tension ?

        There are handheld DMMs available that are true RMS and 100KHz bandwidth.

        Fluke 287

        Keysight U1252 or U1253
        PeteS in CA

        Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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        Comment

        • eccerr0r
          Solder Sloth
          • Nov 2012
          • 8662
          • USA

          #5
          Re: how to measure hight tension ?

          My old Tek scopes are good for up to 400V P-P though I'm not sure why they have such a high limit, 8 divisions at 5V/division is nowhere near 400V.

          My Vu Data scope goes to 20V/division with 8 divisions, and thus one would hope that it can deal with 160V P-P.

          If you have a 10:1 scope probe, that's all that's needed for at least my scopes to deal with a 300V P-P signal...

          Comment

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