Re: An High Voltage question of Tektronix THS730A(THS700)

From: TekMan (and7_at_bigfoot.com)
Date: 11/16/04 

Date: 16 Nov 2004 00:53:06 -0800

tedchiang999@yahoo.com (Teddy Chiang) wrote in message news:<93972683.0411131919.11e7211b@posting.google.com>...
> and7@bigfoot.com (TekMan) wrote in message news:<6a624601.0411102340.23ef2ceb@posting.google.com>...
> > > The THS700s are battery-powered,insulated scopes.
> > > I'd worry about potentials between each probe,though.
> >
> > I'd worry too.
> >
> > the Tek 222/222A/222PS had preamps with isolation barrier, seperate
> > for each of the channels. This technique easily allowd 500V diffrence
> > between both channels, and still save work (not too high humidity
> > conditions, of course).
> >
> > The THS7xx uses a little bit different input technique, so I would not
> > risk going that high.
> >
> > hth,
> > Andreas
>
> Andreas,
>
> Did you mean that the THS700 will be damaged if I don't use TEK's HV
> probe(P5210) for common-mode voltage larger than 30V? Or it's just a
> safety consideration for floating voltage?

You have mentioned 160 V and higher in your first posting.
See the difference to mentioning now 30V?

well, to my opinion I ALWAYS would use a probe. Depending on the
floating voltage you have and the BW you need to measure: chosse the
P5210 or a simpler (not-HV) one - that's depending on your measurement
setup.

hth,
Andreas

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