[time-nuts] Re: Picotest U6200A problem with measuring PPS period very second.

[Bob kb8tq]

Hi

If your goal is an ADEV measurement, you will need to tag the
edges against a second “stable” PPS signal. A sequence of period
measures can get you into issues related to round off problems. 

Bob

> On Feb 27, 2022, at 11:27 AM, Erik Kaashoek <erik at kaashoek.com> wrote:
> 
> But why can't you measure the 1 s period of a PPS?
> If the counter would be able to do gapless measurement and you set the gate to 0.9s it should be able to measure the period of a PPS, at least my own build counter behaves that way so I was surprised the U76200A could not do that.
> 
> On 27-2-2022 14:25, Azelio Boriani wrote:
>> Without a reference? If the same PPS acts as start and as stop then
>> one (I suppose) rising edge is start and the next rising edge is stop,
>> so a measurement every second is not possible. Maybe a dedicated
>> hardware with two channels where one edge is the start for a channel
>> and stop for the other is necessary.
>> 
>> On Sun, Feb 27, 2022 at 12:08 PM Erik Kaashoek <erik at kaashoek.com> wrote:
>>> I'm trying to measure the phase of a 1 second PPS from a cheap GPS
>>> module using a Picotest U6200A
>>> Set up in time/period mode, input 1. Trigger level is set to 1V, DC
>>> coupling, all seems to work well but there is only one measurement every
>>> two seconds which either misses output the in between periods of
>>> averages over two periods.
>>> Does anyone know if it is possible with the U6200A to measure every
>>> period of a PPS?
>>> Erik.
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