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647: Difference between revisions
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The calibrator in the 647 is based on a 4 kHz crystal, | The calibrator in the 647 is based on a 4 kHz crystal, | ||
which is divided down to 1 kHz. | which is divided down to 1 kHz. | ||
Its specified tolerance is | Its specified tolerance is ±1 Hz. | ||
==Pictures== | ==Pictures== | ||