On Friday afternoon we realizied that we were not able to use diaggui software to perform for fourier analysis anymore. After launching any measurements we got the error message: " test timed out".

I contacted Yamamoto-san in KAGRA and he explained me that this problem is caused by a difference between a system time of the client workstation (desktop1) and a timing signal on the standalone. The system time of the client workstation is synchronized to a correct time via NTP (probably within 1 second accuracy). But the accuracy of a timing signal on the standalone depends on the 65kHz-clock signal from a function generator. So the time on the standalone deviate from the correct time by the long term operation because the function generator is not so accurate for the real-time system.