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Spark Gap Correction Factors 

Effects of atmospheric conditions

V = k* V0

where k is a function of the air density d

d = p/760 * (293 / (273+T)) where p in Torr and T in degrees C

 

d0.700.750.800.850.900.951.01.051.101.15
k0.720.770.820.860.910.951.01.051.091.12

The voltage increases with humidity varying some 2-3% over a normal atmospheric range of 8-15 g/m3.

Irradiation

If the gap is illuminated with UV or X-rays, it is more easily ionized. The effect is more pronounced with smaller gaps, a 20% reduction for short gaps of a few cm when irradiated. For this reason, UV irradiation is specified for accurate breakdown voltage tests, particularly with smaller gaps.


Copyright 1998, Jim Lux / sgcorr.htm / 8 March 1998 / Back to HV Home / Back to home page / Mail to Jim

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