azonenberg changed the topic of ##openfpga to: Open source tools for FPGAs, CPLDs, etc. Silicon RE, bitfile RE, synthesis, place-and-route, and JTAG are all on topic. Channel logs: https://libera.irclog.whitequark.org/~h~openfpga
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<Peanut>
agg: there's very few counters with a 20ps single shot - are you using a SR620?
<agg>
Peanut: keysight 53230A, though I don't think it's really the right tool for measuring pll jitter
<Peanut>
That was going to be my second guess - I had the 53230 in my lab at work about 5 years ago, but we sent it back to KS because the firmware was not usable for long-term measurements of PPS signals.
<agg>
It has some annoying quirks
<agg>
I wish the timestamping was a little better too
<agg>
What problems did you have measuring PPS, if you can remember?
<Peanut>
Yes, firmware crashes after recording time interval values for a while. And no ability for it to simply dump the interval on every measurement.
<Peanut>
This was in 2015, and the message I would get after 1375 seconds was "+322 Measurement Overflow Occured".
<agg>
I think I got mine to timestamp each edge continuously while being able to drain the measurement buffer separately but probably slightly different enough to hit different problems
<agg>
Wish the manual had a bit more detail too
<agg>
Still it's a fun instrument for a lot of things where a scope is a bit too slow or fiddly
<agg>
I got it cheap used, not sure it would be worth the sticker price :p
<agg>
Need to get or make a phase noise measurement set really
<Peanut>
It's tempting to try and replicate a 3120A, like Andrew Holme (and others) have done. My current work is pretty close, trying to replicate a DDMTD in the ECP5.