Ask Experts Questions for FREE Help !
Ask
    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.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Alcohol testing EtG testing [ 4 Answers ]

I had a etg/alcohol test 10 days ago and had wine the evening prior? I have not heard back from the lab. Has anyone failed or passed with having alcohol in their system? Thank you. Really stressed and very stupid!!

Computer how do I stop limewire setup dialog from popping up on my computer [ 1 Answers ]

Can someone help me stop limewire setup dialog from popping up on my computer, it always pop up while I am in the middle of something

Direct computer to computer connection via Ethernet ports [ 1 Answers ]

I should like to connect two Windows XP computers via Gigabit ethernet ports. What a software is necessary To ensure the possibility to use one of the PCs as a terminal of another With sharing HDDs ets?

Newly built computer for sale! Powerful Computer! [ 1 Answers ]

I have a computer for sale, here are the specs: DFI Landparty NF4 SLI-DR Motherboard AMD64 X2 Dual Core 4800+ Processor 1GB of Corsair XMS Dual Channel RAM Aspire X-Cruiser Silver Case 550 Watt Antec True Power Power Supply 7800GTX 256MB DDR3 Graphics Card with SLI enabled 300GB Maxtor...

View more questions Search