[sdiy] Jp-8 head scratcher

cheater00 . cheater00 at gmail.com
Fri Nov 8 11:53:31 CET 2013


Hi Maarten,

On Fri, Nov 8, 2013 at 9:59 AM, Maarten Halmans <diy at artefacts.nl> wrote:
> Hello
>
> It might be time to start measuring differentially. The Tek P6046 is a good
> tool for that.
>
> I have no experience with differential probes, could you please explain how
> this would help in this context.?
>
> Best,
>
> Maarten

You say your measurements with an oscilloscope display no issues.
However, normal single-ended measurements can obscure issues caused by
e.g. ground plane impedance. This is a consideration for complicated
systems, and the Jupiter 8 is huge. Mixing desks are another example.
Instead of measuring near multiple components with regards to some
specific ground point, differential measurement means that you measure
the voltage a component is receiving or producing with reference to
its local ground. This way one can spot issues that are normally not
visible.

This probe (the P6046) has differential input. It has two "tips",
think of one of the tips as serving the same function as the ground
clip on most probes serves.

Cheers,
D.



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