Can I adjust the thermocouple input card (DT5)? I can't find anything like an adjustment volume.

This type is adjusted by using the VJ77 or Handy Terminal. Connecting it will require an extension card (DXT) or communication card (DSC2).

VJ77

The VJ77 Parameter Setting Tool is a PC software package for setting various parameters of YS80 series rack instruments with the BRAIN communication function.