Table 4.

Frequency fluctuations test data of low-pass filter output from 600 s to 3600 s when $F=90 \mathrm{cN}$ (the group where the greatest fluctuation occurred, and the red color is the maximum data for this group of tests).

Time(s)	600	700	800	900	1000	1100	1200	1300	1400	1500	1600
$\Delta f_{\delta }$(Hz)	0	19	21	22	23	22	22	22	21	21	20
Time(s)	1700	1800	1900	2000	2100	2200	2300	2400	2500	2600	2700
$\Delta f_{\delta }$(Hz)	20	19	20	20	20	21	21	21	22	22	22
Time(s)	2800	2900	3000	3100	3200	3300	3400	3500	3600
$\Delta f_{\delta }$(Hz)	22	21	21	20	20	20	21	23	27