RE: HV Voltage Dividers

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

Original poster: Marco.Denicolai-at-tellabs-dot-com 

Hi Dan,

I posted once this to you privately but you didn't answer. Here we go
again.

I had a look at your voltage divider. I am wondering what model for the
resistors and the capacitors you are using in your PSpice simulations.

I use MicroSim and the plain models that come with the evaluation
version. With those, I get a perfectly flat response just removing your
compensation network and replacing your C100 (25.3nF) with a 5.86 nF
value. Just using the RC=constant usual method.

If you used some "real" models, could you please give me some
information on them? Maybe you had a run on a RLC analyzer on each R and

C and made an equivalent network for them?

Best Regards

 > -----Original Message-----
 > From: tesla-at-pupman-dot-com [mailto:tesla-at-pupman-dot-com]
 > Sent: 1. huhtikuuta 2004 07:17
 > To: tesla-at-pupman-dot-com
 > Subject: Re: HV Voltage Dividers
 >
 >
 > Original poster: "Eastern Voltage Research Corporation"
 > <dhmccauley-at-easternvoltageresearch-dot-com>
 >
 >  > Instead of a HV probe, couldn't one just wire several resistors in
 >  > series, read the drop across one of them and just apply Ohm's/
 >  > Kirchhoff's law? Maybe those 10M resistors used for
 > draining the primary
 >  > caps? Three resistors will give 1/3 of the applied voltage
 > across any
 >  > single resistor; 4 resistors-1/4.  If you think the 4000V
 > label might be
 >  > correct, go with 5 resistors, a 1000V meter could do that
 > one.  I don't
 >  > know why I haven't done this myself, I have been putting
 > 120VAC into the
 >  > HV windings and measuring the output of the low voltage
 > side, and figure
 >  > my ratios.  I'm not sure how accurate this is, but it
 > seems to be pretty
 >  > close.
 >
 > If you are measuring DC or very low frequency (like 60Hz),
 > this might be
 > okay.
 > However, you won't get any type of good frequency response out of a
 > resistive
 > divider like this.
 >
 > To get an idea of some high voltage dividers I've built, see
 > the following
 > link:
 > http://www.easternvoltageresearch-dot-com/hv_divider.htm
 >
 > Dan
 >
 >
 >