# Re: Single vs Two Phase

```Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Sure you can.
Differential probes, or single ended probes and a diff plug in,
or, a two channel plug in, or front end, in differential mode.

(OK: Need 4 channels, to make a 2 diff channels that way....)

(hint:
diff mode, however derived, is REAL HANDY for other purposes
around high 'noise' fields..)
best
dwp
=======================================================
Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
> DWP -
>
> You cannot "throw a scope on the delta". An electrical three phase delta
> connection cannot be made to a scope because the reference neutral is needed
> which makes the three phase connection a Y connection. The three phase delta
> connection is used mostly for motors and transformers.
>
> John Couture
>
> ----------------------------------
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Monday, January 07, 2002 8:44 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Single vs Two Phase
>
> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <davep-at-quik-dot-com>
>
> Tesla list wrote:
> >
> > Original poster: "John H. Couture by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
> > DWP -
>
> > Not correct. The electrical delta system is represented as three vectors
> in
> > the form of a triangle with three 60 degree angles, not 120 degrees as you
> > indicated.
>
>         Delta and wye are both 120 degrees.
>         The closed delta in the drawing is basically a graphical short hand.
>         cf any text.  Throw a scope on the delta.  (at suitably
>         safe voltages...  One can derive a reference neutral
>         relatively easily.)
>
>         best
>         dwp

```