FTR-01H series portable digital fault recorder and analysis system which has been widely ... , optional.4, 16 dry event input channels (12VDC supplied by device internally)5, 16 wet event input channels (24,110,220VDC ... , optional.4, 32 dry event input channels (12VDC supplied by device internally)5, 32 wet event input channels (24,110,220VDC ...