PQR
Series Model D52
Page 45
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V2.1
DROPOUT (NOTCH)
A condition where a portion of the sine wave has a lower
than expected value or is missing entirely, usually for a
portion of a cycle. These types of problems can be caused
when large motors are started, Lightning arresters are
employed (during a lightning hit), or when electrical
equipment fails. Dropouts can lead to failures in
computers and electronic equipment , reduced life of
motors and flickering lights.
POWER FAILURE
When the duration of a dropout exceeds 1 cycle it is
usually referred to as a Power Failure, or Blackout. This
problem is the easiest to observe.
Figure PT 2 - Dropout
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