When developing emission limits for industrial, scientific,
and medical (ISM) equipment, it is useful to relate the effect
of certain operating probabilities, e.g., operating
power, non-isotropic radiation patterns, duty cycle, etc., to
the allowable emission of the ISM equipment. This model
compares the probability of television reception interference
from ISM equipment operating under theoretical
"worst case" conditions (an isotropic radiator which radiates
continuously at the maximum permitted emission) to
that from ISM equipment operating under realistic conditions
(e.g., lobed emission pattern, power variation, duty
cycle less than 100%).