conductivity with a multimeter

Discussion in 'General Electronics Chat' started by Tim Ostrom, Oct 27, 2008.

  1. Tim Ostrom

    Thread Starter New Member

    Oct 26, 2008
    Thanks for all those who responded to my question, from yesterday.

    Does anybody have a schematic for this.
    I have batteries and ac/dc converters but no low power ac power supplies. What would be a good value for the ac power supply and the resistor???

    Thanks again,
    tim ostrom
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    12 volts from a transformer is adequate, and the resistor may need to be adjusted for cell conductivity. That is vague, I realize, but you want a drop across the cell large enough to get an accurate reading with the voltmeter. You don't want to have 11.9 volts across the fixed resistor and only .1 across the cell, for instance.

    So you might have several 1% resistors on hand - 1M, 100K, 10K, 1K should cover it.