Simple schematic showing the readout chain for every sensor all active seismic systems for aLIGO: BSC-ISI, HAM-ISI, and HEPI. Also includes the HAM-ISI Test Stand
Fixed BSC-ISI ST1 T240 trillium interface from a fixed gain of +1 and switchable gain of +113 to a fixed gain of +2 and switchable gain of +57, as is indicated in D1000749-v3.