When we do a TDI with 1 sec counting intervals, the analysis time goes from 2 minutes (60 sec peak, 30 each bkg) to over 8 minutes. When you watch the counting output in the acquire window it is like it is acquiring one second of data on spectrometer 1 then writing it, before continuing onto the next spectrometer counting for another second writing that, etc etc. for each spectrometer in sequence, not simultaneously counting on each spectrometer. Is this a glitch in the output of the acquire windows that it can't keep up, or is it actually doing each spectrometer individually, in sequence. Based on the increased time the analysis takes it makes me think that it is not doing simultaneous acquisition, but then I didn't write the code.