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Phasemeter output waveform resolution

Phasemeter output appears to have phase drift

Written by Paul Cracknell

Updated at February 9th, 2021

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The Moku:Lab Phasemeter instrument can generate an output waveform. This waveform is generated by a NCO ('numerically controlled oscillator') with an internal Moku:Lab reference of 10 MHz. Over a long period, it is possible to observe a steady slow phase drift when comparing this output waveform with another signal.

The precision of this output waveform is defined by the resolution of the NCO thus :

Any mismatch in the signals frequency leads to an observable but slow drift of phase.

phasemeter nco output resolution phase drift

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