Reports 1-1 of 1 Clear search Modify search
VIS (SR2)
fabian.arellano - 12:40 Tuesday 23 June 2020 (14595) Print this report
Comment to IP-L open loop transfer function measurement. (14582)

Correction of the results reported in entry 14589.

In case you don't see the figures attached, please click here: 14595.

I found an error in my script that affected the phase in the plots of the DC OLTF and AC OLTF, but it didn't affect the phase of the total OLTF. After correcting it I did consistency checks and I report the correct result here.

The measurement reported in entry 14582 provides -OLTF rather than the OLTF directly.  Additionally, it's worth saying the measurement assumes the effect of ground motion to be negligibe compared with the effect of the white noise with which the system was actuated.

Results from OLTF

DC control OLTF: UGF: 8 mHz, phase: -97 degrees

AC control OLTF

  • UGF: 43 mHz, phase: 51 degrees,
  • UGF: 94 mHz, phase: -150 degrees,

Total DC + AC control OLTF

  • UGF: 6 mHz, phase: -98 degrees,
  • UGF: 47 mHz, phase: 41 degrees,
  • UGF: 90 mHz, phase: -151 degrees

Commets

From the fourth plot which shows the total OLTF with the phase unwrapped:

  • The phase at 406 mHz is -580 degrees.
  • The phase at 671.9 mHz the phase is -560 degrees.
Images attached to this comment
Search Help
×

Warning

×