Non-linear as in, even passive resistors showed...
current proportional to v *and* v^2 !
And the coefficient for the nonlinear term was much larger
than I wanted.
- Robert -
On Mon, 18 Jul 2005 09:32:29 -0700
"Ralph McDiarmid" <[email protected]> wrote:
> Sorry Robert, but I'm not sure how high voltage is
> non-linear. If you
> mean saturation effects in the active probe itself, then
> I suspect that
> would be noticed during a DC calibration, wouldn't it?
> (Vout vs Vin as
> non-linear function)
>
>
> Ralph McDiarmid, AScT
> Compliance Engineering Group
> Xantrex Technology Inc.
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf
> Of Robert A. Macy
> Sent: July 18, 2005 9:01 AM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: calibration of high-voltage probe
>
> That works for "linear" systems. But, alas, high voltage
> is often
> nonlinear. Should not extrapolate.
>
> Whenever I get into these kinds of areas the words of
> Prof Ron Bracewell
> still ring in my ears, "...those measurements are a
> little like
> predicting the distance to a curb by measuring the slope
> in the center
> of the street."
>
> - Robert -
>
> On Mon, 18 Jul 2005 09:42:25 -0600
> [email protected] wrote:
> > Ralph,
> >
> > When I've calibrated HV probes I have not always had a
> HV pulse source
>
> > that would allow calibration at the maximum rated probe
> voltage. In
> > that case I check the DC divider ratio at a low,
> medium, and high
> > voltage to confirm that there is no voltage
> coefficient. Then
> > calibrate the probe using a pulse that gives a useful
> measurement.
> >
> > Dave Cuthbert
> > Micron Technology
>
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/listserv/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected]
Mike Cantwell [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
Jim Bacher: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
