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    woodguy7777's Avatar
    woodguy7777 Posts: 4, Reputation: 1
    New Member
     
    #1

    Sep 11, 2009, 06:42 PM
    Testing computer fan
    I have been running a few test using my computer cooling fan.
    Just to experience using a multimeter for resistance testing. What I have found when I connect
    My multimeter leads to the fan motor I get one resistance reading but if I swap the multimeter leads I get a diff reading. Is this normal?
    Or is there a problem with my meter.
    Thanks paul
    Scleros's Avatar
    Scleros Posts: 2,165, Reputation: 262
    Hardware Expert
     
    #2

    Sep 11, 2009, 08:23 PM
    Computer fans are typically motivated by a brushless dc motor which have an electronic controller to switch the current flow through the windings and are therefore not a purely resistive load. So yes, you probably will get different readings. Check your meter by measuring a purely resistive load, like a piece of wire, and swapping the leads.

    Note very few devices in today's world are purely resistive.

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