[Test-Equipment] HV probe resistor selection

[Dave C]

On 23 February 2013, at 9:03 AM, David wrote:

> The 25 megohm 3.8 watt resistors are just over 1 inch long.

Using multiple resistors (3x 25 Mohm) means solder connections between. At max voltage (45 KV across all 3) means the first joint will be 35 KV. I'm concerned about flashover. Not sure about the absolute risk here but just comparing the 1 resistor to 3 and the relative risks. I think I'm more willing to go with resistors that won't give me a clean divide ration, and adding a pot to calibrate.

Dave