Krishna pointed out last night/ this morning that the new IIR filter we are using for sensor correction at ETMX was designed around an STS-2. We have a T240 at EX, so we needed to adjust the filter some. Basically, we just divided all of the frequencies of all poles/zeros by 2 to approximate the shift from a 8mhz sensor to a 4mhz sensor. This was done for X and Z on the ISI, but just X on HEPI. If we use Z senscor on HEPI, this change will need to be copied over. If we use this filter at the corner or EY, we will have to remember to reverse the change to work with STS's again.

Basically we turned the original istalled IIR:

zpk(-2*pi*[0 0 0 0.01 pair(0.09,50)],-2*pi*[0.005 pair(0.03,65),pair(0.01,70),pair(0.07,50)],1)

into:

zpk(-2*pi*[0 0 0 0.005 pair(0.045,50)],-2*pi*[0.0025 pair(0.015,65),pair(0.005,70),pair(0.035,50)],1)