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

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    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

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    +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

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    Excellent suggestions - many thanks!
     
  4. drfrankencopter

    drfrankencopter Member

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    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

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    Hi Kris,

    Alligator clips, no touching of the leads.

    Thanks!

    Nigel
     
  6. CitizenCain

    CitizenCain Member

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    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

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  8. donnyjaguar

    donnyjaguar Member

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    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.
     

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