High voltage probe

Discussion in 'Homework Help' started by tpseh9985, Sep 18, 2009.

  1. tpseh9985

    Thread Starter New Member

    Aug 31, 2009
    May I ask how to build a high voltage probe about 1kV. As I know, the multimeter that I have can only measure up to 600V. Thank you.

  2. JDT

    Well-Known Member

    Feb 12, 2009
    Best to make a voltage divider using a string of high value resistors. First, you need to find out the input resistance of the multimeter. Often this is 10M ohm. See the instruction book.

    If it is 10M ohm, then a string of resistors totalling 90M ohm in series with the input will give a 10:1 range increase (0 - 6kV).

    Good idea to build all the resistors inside a plastic box. Even better, fill the box with potting compound.

    Be very careful here. If the ground probe gets disconnected then the meter will be at high voltage!