[sdiy] 2 multimeters showing different voltages

[Future Image]

I talked to my electronics teacher about this and he told me that 
multimeters will usually show fixed-but-random values if a small load isn't 
put on them. Maybe try wiring up a resistor and LED to the supplies then 
measuring?


>From: "Scott" <Scott at scottwick.com>
>To: "synth-diy" <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] 2 multimeters showing different voltages
>Date: Tue, 7 Aug 2007 11:07:32 -0500
>
>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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