This is the time it takes the unit to respond to
deviations in the incoming voltage. The shorter the time, the better
the unit is at keeping the voltage within the output regulation range. There
is another term, "correction time" that may also appear in
specifications. This is the time that it takes for the unit to adjust
the output voltage to within the output regulation range, once the unit
has begun to respond. The total time it takes a unit to correct a low or high voltage situation is the response time plus the correction time. Electronic
voltage regulators are so fast, that response time and correction time
are frequently used interchangeably. On the other hand, mechanical
voltage regulators have a response time similar to that of the
electronic units, but their slow correction time (measured in seconds)
is really the limiting factor. 
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