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Re: [TCML] voltage divider



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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