Re: ScopingSSTC

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Rich Simpson <richcreations@xxxxxxxxx>

Cause the "neutral" you speak of is really a ground... if you need to
do differential measurements, what I do (as I do not have a
differential probe) is take two scope probes, plug one in to each
channel on a dual trace scope, connect the grounds from the two
probes together, and use one probe for each side of the source you
want to measure. you will also want to set your scope to "additive"
instead of altertnating, or chopping, if your scopes preamp does not
do additive, this will not work.

If you are measuring a signal that is not "floating", i.e. a ground
referenced signal, this is not needed.

(I have a Tek 535A, and a 545A, some of my preamp plugins do this,
some do not, I wish I just had a differential plugin...)

-Rich
On Dec 14, 2005, at 1:44 PM, Tesla list wrote:

> Original poster: "Alexander Turkin" <alex_3@xxxxxxx>
>
> Hi everyone!
>
>    I cannot understand the purpose of differential measurment. Why
> can't I check the form of the signal by connecting the neutral
> probe of the scope to one end of GDT and the other probe to another
> eng of GDT?????? I think that it would be OK, because i DON't touch
> anything, but the wires of GDT (i mean the secondary winding, of
> course)
>
> Thanks.