Re: Plug in power voltage?

["Klas Strandberg" klasstrandberg]

Great Matt! Thank you!

This needs some consideration.

You have to load the Sony 3 times as much to squeeze the 0,5 mA out
of it because the voltage drops..?
Do you see any other interpretation?

Klas.



At 18:22 2009-08-21, you wrote:
>On Aug 21, 2009, at 7:07, Klas Strandberg wrote:
>
> > Hi folks!
> >
> > It would help me and users if I better knew about the plug in power
> > voltage that different recorders provide.
> >
> > This is the test:
> >
> > 1/ Connect a potentiometer and a mA meter in series between input
> > and ground.
> > 2/ Set the potentiometer so that the mA meter shows 0,5 mA.
> > 3/ Measure the voltage between input and ground.
> >
> > For the moment I am specially interested in the voltage that Sony
> > PCM-D50 provides at a given current, like 0,5 mA.
> >
> > Klas.
> >
> >
> >
>
>
>OK, I just did the LS-10, too:   1.93V
>
>To summarize (view in a monospace font):
>
>MODEL           V (unloaded)    V @ 0.50 mA    Load (Ohms)
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
>Sony D10          2.82            0.52           1030
>Zoom H4n          2.84            1.82           3606
>Olympus LS10      3.02            1.93           3828
>
>
>So the Sony is an outlier here.
>
>Note that my 0.50 mA current adjustment was only approximate -- I set
>the load resistor to get as close to 0.500 mA to flow as I could, but
>really got only within +/- 1 % or so.  So the loaded voltage isn't
>exactly R * .0005, because the current wasn't exactly 0.5000 mA.  It's
>just close.  Ohm's law still applies in Philadelphia, in spite of what
>the numbers above might suggest!
>
>V measurements were done with a recently calibrated Fluke 189.
>Current was measured with a Fluke 289, also recently calibrated.
>
>-matt
>
>
>mab blogs at http://www.crypto.com/blog/
>
>
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