I've been trying to turn on Sensor correction at HAM2 & HAM3 on the ISI's. HAM2 works as expected, but HAM3 gets almost nothing from turning it on. So far I've look at the the input filters (HAM3 was looking at the wrong STS originally, and the cal filter had a pole and zero at 1), the Hua filters (which all look the same) the input and output spectra at various places on the STS signal path (which all look the same, that I've found) and the chambers isolation filters (which, again, look very similar). Not sure what's going on.