Re: [TCML] voltage divider

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Something I've not heard mentioned is calibration of the divider. If 3 
resistors are used in the divider, the center resistor can be a 
potentiometer used for calibration (the center pot is a portion of the 
low voltage resistor). This is what I did with a home brew divider. For 
calibration, I used a MOT driven by a variac to handle a voltage my 
meter was capable of (1000V). But, this is a poor avenue for 
calibration. In the end, I decided to dump the divider and just buy a 
high voltage probe ;-) . High voltage probes are cheap and on eBay all 
the time. But when it comes to hv probes, "NEVER" buy used without a 
money back guarantee. It should be "new" and capable of AC measurements.

Bart

Paul Bidmead wrote:
> David
>
> this is dependant on the resistances you choose
> P = V^2 / R
>
> so a 1M divider @ 5kv
> P = 5000 x 5000 / 1000000
> P = 25w
> a 10M @ 5Kv = 2.5w ect.
>
> Regards
> Paul Bidmead
> BidSpec Electronics Engineering
> Mob: 0404 259 733
> Email: admin@xxxxxxxxxxxx
>
> David Nelson wrote:
> > Paul
> >
> > Thanks for your post about voltage dividers. For measuring NST 
> > outputs what power rating of resistors is required. I mean will 1/4 
> > watt resistors work? 100W?
> >
> > Dave Nelson
>
>
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