Multi meter accuracy?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by v-verb, Feb 23, 2008.

  1. v-verb

    v-verb Member

    Messages:
    5,897
    Joined:
    Jan 4, 2002
    Location:
    Toronto
    Guys,

    I've done the search and couldn't find an answer so here goes. I've bought and sold a few pickups and consistently my cheapo multimeters seem to read the ohms lower than what they really are.

    Case in point: I purchased a non t-top pickup a while back and it read 8.28 kohms. At home my meter read 8.05. I went out and bought another cheapo multi meter and it read 8.08.

    Doesn't seem like a big deal but when it comes to vintage pickups it can be. I traded an old DW PAF that I read as having 8.0 something K ohms. Turns out it was actually something like 8.3 k ohms.

    As well I'm wondering about the accuracy of voltage readings, etc when using my meter to doublecheck my variac voltage output.

    So what meters are most accurate and do I have to spend big bucks?

    Thanks!

    Nigel
     
  2. Wakarusa

    Wakarusa Member

    Messages:
    1,461
    Joined:
    May 7, 2004
    Location:
    Indianapolis, IN
    +1 for the Fluke line of meters. Also, if you're using the meter for trade (even if the trade is just a hobby) where accuracy and reputation can be synonymous, you might consider sending your nice new Fluke to the calibration lab -- you get a nice sticker saying somebody official thinks it's accurate too.
     
  3. v-verb

    v-verb Member

    Messages:
    5,897
    Joined:
    Jan 4, 2002
    Location:
    Toronto
    Excellent suggestions - many thanks!
     
  4. drfrankencopter

    drfrankencopter Member

    Messages:
    1,546
    Joined:
    Feb 17, 2006
    Be careful about how you test for resistance. How did you attach the probes to the leads? If the leads are oxidized you might get a higher reading. If you're holding them in your hand, you might get a lower reading due to the parallel path through your body. Are you using aligator clips?

    Also, when using multimeters its a good idea to twist the probe wires together, this reduces the 'loop area', and makes them less liable to act like antennas.

    Cheers

    Kris
     
  5. v-verb

    v-verb Member

    Messages:
    5,897
    Joined:
    Jan 4, 2002
    Location:
    Toronto
    Hi Kris,

    Alligator clips, no touching of the leads.

    Thanks!

    Nigel
     
  6. CitizenCain

    CitizenCain Member

    Messages:
    4,823
    Joined:
    Jan 10, 2004
    Location:
    Magdalena, NM, US
    Temp affects the readings you get, too. Measure a pickup, then hold it your hand or under a light for awhile, then measure it again. You'll get a higher reading.
     
  7. v-verb

    v-verb Member

    Messages:
    5,897
    Joined:
    Jan 4, 2002
    Location:
    Toronto
  8. donnyjaguar

    donnyjaguar Member

    Messages:
    4,217
    Joined:
    Nov 4, 2005
    Location:
    Canada
    Hey, I've got one of those model 11 meters. Works like a champ, you won't be disappointed. If you put it on diode-check it will more accurately measure batteries too.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice