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How bad is a Frequency Error of 500 PPM?

April 26, 2017bad Error Frequency

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How bad is a Frequency Error of 500 PPM?

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As most people have some trouble with that abstract PPM (parts per million, 0.0001%), I’ll simply state that 12 PPM correspond to one second per day roughly. So 500 PPM mean the clock is off by about 43 seconds per day. Only poor old mechanical wristwatches are worse.