[sdiy] 2 multimeters showing different voltages

[dj hohum]

Try replacing the batteries in both with known fresh batteries. I've
had inexpensive meters behave strangely on low battery power.

Next thing is to check the voltage of a fresh 9v battery. It should be
very close to 9 volts.

Finally, and I know that you're not doing this, but someone else might
do such a thing :), make sure that they're both on DC volts and did
not get switched to AC volts.

daryl

On 8/7/07, Scott <Scott at scottwick.com> wrote:
> I've got two multimeters, and each is showing a different voltage.  One
> shows my synth to be at a solid 15 volts, and the other shows it at
> 17.5.
>
> I tested my computer PSU to try to figure out which one is correct, and
> I still don't know!  One shows the PSU 12v output at 11.05, and the
> other shows it at 12.62.
>
> Both meters are less than 3 years old, and have little use.  One is a
> radio shack, the other is a Velleman.
> I'm starting to think that the one that shows 17.5v (and 12.6 on the
> computer PSU) is correct.  However, that would mean my synth PSU came
> calibrated incorrectly.  (which is possible.. its just a used power-one
> supply)
> Does anyone know how I can figure out which to trust?
>
> Also, how much of a difference would those 2 volts make?  If my synth
> PSU is putting out +/- 17.5v, would that explain some tuning issues I've
> been having?
>
> thanks!
>
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