Ascel Electronic AE20401 Frequency Counter Issue - 10MHz GPSD Reference, Part 2/2

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Ascel Electronic AE20401 Frequency Counter.
1ppm TCXO "Timebase" Option Fitted.
Measurement not stable, fluctuating +/-
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That does bounce around a little bit doesn't it. I purchased the 1 ppm timebase option for my Ascel unit as well. I will have to run a test against mine, not sure how stable a pulse generation I will be able to create though.

three-phase
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see similar behavior of my kit:
video 1/2:
video 2/2:

srz