Random noise always converts into time jitter. It doesn't
matter how much you amplify the input signal, noise can push
the detected zero crossing wherever it wants to.
-Chuck Harris
Magnus Danielson wrote:
On 11/16/2013 09:52 AM, Chris Albertson wrote:
Your method tosses out a lot of data. You can't see transients. Ideally
rather then record a 1 second average you'd record the time of EVERY zero
crossing. It sounds like a lot of data but not really. You only record
32 bits 60 times each second. That is 240 bytes per second.
But you want it filtered to avoid the transients. Those are really not
that interesting when you measure the grid.
Also, if you use the event trigger method you probably want to use an
amplifier to increase the slew-rate such that noise does not convert
into time jitter.
Cheers,
Magnus
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