Need a manual or at least front-end schematic for the AIL or Eaton 7310 System Noise Monitor. May also need the input relay, not sure yet. This seems to have been made by Magnetico, Inc. with a date code of 8310. IIRC, the PN is 12420 but I'll have to look at it again (the instrument's at work right now). Thanks! Steve, K0XP