Re: High Voltage Resistors

On Mon, 12 Jun 2006 18:41:29 +0200, "Juan" <jsainzgilNOSPAM@xxxxxxxx>
Gave us:

Hi all,

I'm looking for high voltage resistors for electrostatic discharge tests,
470 kohm. The pulse discharge has a rise time of 1 ns, it's about 60 ns
long, and the voltage discharge it is up tu 8 kV.

What kind of resistor would I need?

Thanks.

Juan

You want a minimum 2 Watt Carbon composition resistor (not sure of
your stored energy level), which is what is used as an arc suppressor
in HV power supply designs. The bulk resistance medium is the key.
That is what will make it last a good long time. Try between 100k and
500K Ohms.

If you buy an HV resistor, they are made for dropping a specific
voltage, not arc suppression. In fact, arcs will cause them to
fail... miserably.

That is if you plan to use the resistor to quell an arc or discharge
the set.

If you are making a dropping circuit so that you can monitor
voltage, do a search on "Flatso" resistors. You want at least a 10kV,
and I would recommend at least a 15kV resistor The two or three inch
form factor variety are suitable for those voltages typically.
.

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