I've monitored line frequency with one of my old HP frequency counters. A
filament transformer with a potentiometer across the secondary allows me to
dial a safe voltage for the counter, about 1 V RMS.
My ancient counters are limited in their data collection abilities; I'm
sure your picPET device
Phase noise? The line frequency shifts phase every time a major
electrical load is added or dropped from the power line.
Seems to me this effect swamps every error in the measurement system.
You are looking for parts per thousand at most. Precision GPSDO 10 MHz
is overkill.
In my humble opinion,
I did this not too long ago.
I used GPS PPS as the reference.
I took a 9v wall wart, pinned one side to ground, ran the other through a
rectifier diode and into one input of an LM358 wired as a comparator, comparing
to 2.5 volts (Vcc/2). The 358 was slow enough that hysteresis wasn’t required.
Hi Jay,
Building a mains frequency monitor is a great way to expose yourself to almost
everything about precise time & frequency and measurement -- for a few dollars.
Working with quartz, rubidium, cesium simply moves the decimal place over a few
digits.
Have a look at:
http://leapsecond.com/
Seems like you don't have to write much. Put you commands in a text file then a
cron job copies the file to the serial port and send any data coming back to
stdout. Gets piped to script that dumps that and current time to sql database.
I bet a dozen lines of code total.
> On Apr 6, 2016, at 3:
Hi Logan,
I seem to remember Bob Camp mentioning that you can't have multiple satellite
sources in the mix, because the other satellites are inferior to the GPS sats
in timing. Maybe Bob or someone could address this. I would love to discover
that I've set something wrong in all the many, man
Since it seems to be a week for new projects on time-nuts... ;)
So I've been wanting to set up a power line frequency monitor for a while,
and now(ish) seemed to be a good time for me.
So initially, I was planning on doing a simple design that was posted here
a couple of years back, which basical
Dear Mike,
I have a Perl script and a C++ application that may be of use. The Perl
script logs continuously, but is mainly for logging TT? responses. The C++
application is used interactively. Either could be modified to do what you
want.
Take a look at:
https://github.com/openttp/openttp/blob/d
Solid as expected in the North East.
Regards
Paul
WB8TSL
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> One interesting poster from Justervesenet (Norways National Meterology
> Institute) addressed some odd characteristics of the Keysight 53230A
> counter and the way it process data. It have shown several problems, and
> part of the research was done after borrowing a counter from a
> time-nuts
Fellow time-nuts,
Now a few days into the EFTF 2016 in York, I can report we are having
some good fun. Attila get's to bounce his work against some good folks,
and I get to bounce some of my ideas around too, with nice responce.
I did my presentation today, and it went really smooth. I held a
Hi,
I have too been tempted to do this, but never got around to it.
It one among many projects I should do one of these days.
Have a bunch of PRS10 to debug.
Cheers,
Magnus
On 04/06/2016 11:13 AM, Mike Cook wrote:
Before I start re-inventing wheels, has anyone got a non-graphical interface to
I recently bought a number of LEA-M8T receivers and I have to say that I am
unimpressed, so far. They don't survey to the same reported accuracy as the
LEA-6T in the same amount of time. They certainly aren't better in the jitter
after sawtooth correction. So, have I managed to overlook some
Plan C at my job for keeping our time service going was running two
TS2100 machines in conjunction with one another like what Andrew Cooper
did when the rollover bug hit, and which we also did for awhile.
Unfortunately the power unit on one of my units seems to have blown. We
could see that the
Having been a time nut for almost 50 years knot knowing it I like to add
my thoughts. Starting in the late 60's I won second place at IEEE student
contest for my counter design using 7 segment lamp and Motorola RTL in the
70's I buried a Sulzer using bank coin bags filled with sand to close t
Hi
One thing to keep in mind:
If you are looking at stuff like sawtooth on most (but not all) GPS modules, the
counter you use to take the data does not have to be some sort of monster
machine. An old 5334 or 5335 will let you see the basic structure. If you spend
time
shopping, neither one is
Before I start re-inventing wheels, has anyone got a non-graphical interface to
the PRS10.
Specifically, I want to log over time any/all the data points seen on the RbMon
output, though it would be nice to have a curses version of the window.
I have got a sniffer on the link and interaction look
albertson.ch...@gmail.com said:
> I may never get around tooth's as the Rb is very good all by itself to the
> limit of my ability to measure it.
Wait longer. :)
If your Rb doesn't have a PPS, make one. One of tvb's divider chips is
probably the simplest approach. You can probably do it wit
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