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DIY High voltage probe

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Patrick

Fri Dec 10 2010, 07:57PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

no you do it like this:

HV+ <----------/\/\/\/\/\/\--+--/\/\/\-----GND-----/\/ \/\--+--/\/\/\/\/\---------> HV-
| |
+<---------Vmeter--------- >+

it gives you half the error rate, and no corona on the meter, if youhave the meter on the high side you will get bogus data due to unequal e-field division

Patrick

Fri Dec 10 2010, 08:19PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

ASCII doesnt seem to work in the forum.

it gives you half the error rate, and no corona on the meter, if you have the meter on the high side you will get bogus data due to unequal e-field division , and static influence on the A/D semiconductor.

Pinky's Brain

Fri Dec 10 2010, 08:31PM

Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837

That's not really different than simply using two resistor stacks on either side of the current meter, with the analog current meter he uses there is really no room to play with those two center resistors.

If you have two stacks in the first place though you might as well use 2 meters, more information and nearly the same effort.

Patrick

Fri Dec 10 2010, 08:33PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Pinky's Brain wrote ...

That's not really different than simply using two resistor stacks on either side of the current meter, with the analog current meter he uses there is really no room to play with those two center resistors.

If you have two stacks in the first place though you might as well use 2 meters, more information and nearly the same effort.

if you use two meters or the same meter twice, your doubling your error rate.

radhoo

Sat Dec 11 2010, 06:59PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699

Thank you for your comments.

I've decided to keep the 1GO resistor, despite the corona/static charges inside my meter, because I will use it with other HV measurements, not only this bipolar CW multiplier.

All understood, will post pics soon, and update the first post of this thread in case others need the info.

Patrick

Sun Dec 12 2010, 05:44AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

radhoo wrote ...

Thank you for your comments.

I've decided to keep the 1GO resistor, despite the corona/static charges inside my meter, because I will use it with other HV measurements, not only this bipolar CW multiplier.

All understood, will post pics soon, and update the first post of this thread in case others need the info.

there is no reason for corona to be in your meter, unless your doing something wrong.

Proud Mary

Sun Dec 12 2010, 09:00AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Perhaps someone here should have a go at HV measurement with home-made Kerr cells.

It can't be worse than mucking around with all these potential dividers.

Patrick

Sun Dec 12 2010, 07:13PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Proud Mary wrote ...

Perhaps someone here should have a go at HV measurement with home-made Kerr cells.

It can't be worse than mucking around with all these potential dividers.

Pockels, Kerr, and Faraday electrophysical measurement is looking better all the time, compared to all of this crap. But from where will i get the precious glass?

Pinky's Brain

Sun Dec 12 2010, 07:29PM

Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837

If you want really high voltages a Kerr cell would suffer the same problem as the resistor stack if you're not careful ... if you just shine the light through part of the cell you end up measuring the local electric field gradient caused by stray capacitance, although averaging across the complete stack could solve that.

Patrick

Sun Dec 12 2010, 07:38PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Pinky's Brain wrote ...

If you want really high voltages a Kerr cell would suffer the same problem as the resistor stack if you're not careful ... if you just shine the light through part of the cell you end up measuring the local electric field gradient caused by stray capacitance, although averaging across the complete stack could solve that.

Pinky, my brain is a little slow today, please eleaborate.

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