出典:Wikipedia
出典:『Wikipedia』 (2011/06/06 00:13 UTC 版)
A Pulse per second (PPS) is an electrical signal that very precisely indicates the start of a second. PPS signals are output by various types of precision clocks, including some models of GPS receivers. Depending on the source, properly operating PPS signals have an accuracy ranging from a few nanoseconds to a few milliseconds.
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