[sdiy] 2 multimeters showing different voltages

[sdiy]

look in your synth for a voltage reference (i.e REF02, REF102 or similar) and 
measure the output.
Or look for constant current source driving an known resistor with a known 
current. Calculate the voltage at the resistor then measure.

Harald


Am Dienstag, 7. August 2007 18:07 schrieb Scott:
> 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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