NAOJ GW Elog Logbook 3.2
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YuhangZhao - 22:10, Wednesday 10 April 2019 (1287)
Coherent control PLL works again and stability measurement
Yuhang and Matteo
After Pierre replaced the chip of coherent control PLL, we measured the correction signal within a long period of time. This correction signal tells us the stability of CC PLL loop.
The coefficient of variation of the fast correction signal is 0.0538.
While the coefficient of variation of the slow correction signal is 0.1311.
Although we saw a clear change of fast correction signal. The slow correction signal shows much more high-frequency noise.
I also calculated the correlation coefficient between these two signals. It is -0.5155 as we can see one signal is going down while the other is going up.
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