daniel.sigg@LIGO.ORG - posted 14:01, Monday 19 March 2018 - last comment - 16:17, Monday 19 March 2018(41059)
SHG TEC controller tuning
Following the installation of the improved TEC controller for the SHG, we started tuning the loop.
Figure 1: A single pole at 0Hz, a zero at 100mHz and with 10mHz selected in the ugf box. There is a fair amount of overshoot and it takes a long time to settle.
Figure 2: The zero has been moved down to 10mHz.
Figure 3: The zero has been moved down to 5mHz.
Figure 4: The zero has been moved down to 7mHz. The overshoot is about 20%. We are sticking with this value for the zero.
Figure 5: Pole at 0Hz, zero at 7mHz, another pole at 1Hz, gain of -1, ugf box set to 30mHz.
Figure 6: Response measurement at 30mHz, indicating that the ugf is around this frequency.
Images attached to this report
Comments related to this report
Adding a plot of the turn-on transient. Takes about 2 minutes to settle down.
Images attached to this comment
