mains frequency and cheap but accurate clocks

Author	Message
poida Guru Joined: 02/02/2017 Location: Australia Posts: 1470	Posted: 04:59am 18 Feb 2026       the FY6900 is not so good actually. later FW versions do not allow access to calibration and my unit forgets the new calibration over a power cycle. I think if you are really keen on the idea, have a look at this https://www.youtube.com/watch?v=X_fbDlpxg_M external reference and mods the PSU for less noise.