[time-nuts] Building a mains frequency monitor

[Magnus Danielson]

Guten nacht Attila,

On 04/14/2016 12:24 PM, Attila Kinali wrote:
> God middag Magnus,
>
> On Thu, 14 Apr 2016 03:38:38 +0200
> Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
>
>> The professional equipment does it this way. It samples, filters and
>> decimate the data. For the professional use the absolute phase is
>> relevant, so group delay needs to be flat, known an
>> calibrated/compensated.
>
> Jupp, I am aware of those. But I didn't expect many people here
> to know of them :-) I have quite a few friends who work in the
> energy distribution busines and its related problems (like network
> stability, oscillations of dynamic systems, complexity theory etc)
> hence I have a cursory interest in the equipment to monitor power
> networks as well. It is intersting to see, that modern power networks
> rely more and more on precise timing as well.

Indeed. I've even written an article with researchers relating to PMUs.

> Even more interesting
> is that the primary source for time is GPS these days, with all its
> problems. I am not sure whether the desginers of these networks are
> fully aware of the security and reliability implications that come
> with GPS (or GNSS in general). Maybe i should dig a little bit around
> and see what's current common practice in europe.

See my and Alison's presentation at the US PNT advisory board.

Using Alison's words, we need to do some hygiene cleanup.

Cheers,
Magnus