[Kamiizumi, Tomura, YamaT]

This is series work of klog#24726 (IX), klog#24725 (IY), klog#24919 (EY), klog#24916 (BS), and klog#25009 (PR2).

Measurement procedures are same as other suspensions and raw results are saved in /users/DGS/measurements/DAC/k1ex1/.
Only one difference is noise level at output of a coil driver chassis for TM and one of satellite boxes for IM/MN is measured
with 39dB whitening gain instead of 36dB gain because one of used ADC channels is slightly louder than other channels.

Impression
Thanks to the 3 stages of dewhitening filters as a nominal settings in OBSERVATION state,
strange peaks around 33Hz and its harmonics can be almost removed at outputs of the satellite box for both MNV (Fig.1-3) and MNH (Fig.4-6)
But narrow peaks can be seen on some channels.

On IMV (Fig.7-9) and IMH (Fig.10-12) which are enabled 2 stages of dewhitening filters as a nominal settings in OBSERVATION state,
33Hz peaks and its harmonics still remain.
So if DAC range is enough for the full interferometer lock, it may be better to consider to engage the 3rd stage of dewhitening filter.

Three stages of dewhitening filters can remove 33Hz peaks and its harmonics for all TM coils (Fig.13-16).
For H3 and H4, 2 stages of dewhitening filters are enough but peaks remain on H1 and H2 with 2 stages.