An High Voltage question of Tektronix THS730A(THS700)

[Teddy Chiang]

I wish use THS730A to measure two signal with about 160V ~ 200V
floating voltage. Does anyone knows that, will the THS730a be damaged,
if I don't use Tek's P5102 probes.

Please advise. Thanks!
Ted

 

[Jim Yanik]

and7@bigfoot.com (TekMan) wrote in
news:6a624601.0411102340.23ef2ceb@posting.google.com:

Jim Yanik <jyanik@abuse.gov.> wrote in message
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Robert Baer <robertbaer@earthlink.net> wrote in
news:418B43B5.9B481FFF@earthlink.net:

Teddy Chiang wrote:

I wish use THS730A to measure two signal with about 160V ~ 200V
floating voltage. Does anyone knows that, will the THS730a be
damaged, if I don't use Tek's P5102 probes.

Please advise. Thanks!
Ted

For grounded test equipment, one should use two probes, one for
the
high side, one for the low side, and measure the difference.
In this case, one could use a battery powered DVM (or scope)
provided
safety precautions are met, the measuring instrument is insulated
from ground AND one does not touch the equipment when that power is
on (!!!).


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

Do you know of anyone with component-level schematics of the THS series
scopes?
I believe they're in the same category as TDS scope;no schematics in the
"service" manual.



--
Jim Yanik
jyanik-at-kua.net