Re: Differential voltage probes 2

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Finn,

At 06:29 AM 6/29/2003 +0200, you wrote:


>Tesla list skriver:
> >
> > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
> >
>snip
>
> > Finn is also hinting that he could do boards if needed ;-)
> >
>snip
>
>More than hinting, I promise doing it. I can get them done quite cheap
>too.

Cool!!



>I talked to my brother about the project, he imediately said: Use
>instrumentation amplifiers. Analog devices has them for less than 5$
>with below 1Mhz bandwidth.
>
>About voltage rating:
>
>It would be nice to be able to hook the probe across 2 phases on our
>3-phase 400 Volt system.

Easily done...


>One thing I am wondering: If we use the standard probes up front, will
>they need to be high voltage rated too, or will ordinary 1x -10x probes
>with low voltage rating doo?. I don`t know where and how the breakdown
>happens in a probe.

Just 1X standard probes.  But the amps may be able to drive directly into 
the scope too without distortion...  Still have to work that out.

Cheers,

         Terry



>Cheers, Finn Hammer