[time-nuts] Zero-Crossing Detector Design?

Azelio Boriani azelio.boriani at screen.it
Fri Jul 20 23:28:54 UTC 2012


Yes, using a 'scope and the persistence it seems possible to "visualize"
the results.

On Sat, Jul 21, 2012 at 1:03 AM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 07/21/2012 12:09 AM, Azelio Boriani wrote:
>
>> OK, very interesting. Now is it possible to measure/verify this? I think
>> that using any test equipment, the comparator-style approach is
>> unavoidable: the trigger of the scope or the counter cannot be an
>> amplifier/limiter.
>>
>
> If you like to verify what I described, a scope is a good starting-point.
> Using a sine of say 10 MHz and then adding a sine of say 1 kHz, you can
> fool around with trigger point, noise-signal level and source level and
> essentially learn it. Try trigger at zero-crossing, try trigger near the
> peaks. Vary the modulation signal amplitude.
>
>  How to tell what is up to my design under test and what
>> is the trigger contribution? Maybe only by comparison: test design A then
>> design B and see which is better...
>>
>
> Varying the amplitudes is one thing. It's a good stress test. I assume you
> have means to measure it. Doing what I proposed above is also a good
> stress-test, add a noise signal and see how much you must have for it to
> cause serious harm.
>
> I got myself a TimePod for a reason. I also use a CSA-803A scope when I
> need to.
>
> Cheers,
> Magnus
>
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