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VIS (PR2)
takafumi.ushiba - 19:57 Thursday 27 January 2022 (19601) Print this report
Suspension transfer function measurement and model construction: IM stage

Similar work with klog19597 and klog19598.

I measured the TFs of IM stage.
Measured data was stored at /users/VISsvn/TypeBp/PR2/TF/Measurements/20220127/PLANT_PR2_STANDBY_IM_TEST_{L,T,V,R,P,Y}_20220127.xml.

I haven't finished making models of L, T, and V, but not yet finished to make those of R, P, and Y.
So, I will continue to make model.

Comments to this report:
takafumi.ushiba - 12:41 Friday 28 January 2022 (19614) Print this report

I made models of PR2 IM stage at FM10 (SUSMod_220127) of IM_DAMP filter banks.
Figure 1 to 6 show the current models of IML, IMT, IMV, IMR, IMP, and IMY, respectively.

Then, I modified the gain and cut-off frequencies of 4th-order eliptic low-pass filters.
Since IMV and IMR has a strong resonance at the observation band, I set notch filters for these resonance at FM8 (notch) of IMV and IMR filter banks.

Theoretically new filters should work but I haven't checked yet because today is a maintainance day for DGS.
So, I wil check them after finishing today's maintanance.

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