Key Digital ES381 User Manual download pdf (Page 21)

Period mode should be used if you have a single pulse or a slow

input frequency. In the latter case, by timing the period from edge to

edge allows a very accurate measurement of low frequencies by

simply inverting the period measured. This is known as reciprocal

mode. The software shows this reciprocal.

Elan Digital Systems Ltd. 21 USBcount50 USER’S GUIDE Iss1

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Key Digital ES381 User Manual Page 21