Hello madaeo,
Attached below is TDS600A.ADJ Field Adjustment Software. To add support for TDS640 (plain, no letter) to TDS600A.ADJ after installation:
Open directory TDS600A.ADJ
Edit DUTLIST. There are three entries, TDS620A, TDS640A and TDS644A
Add TDS640 below the last entry, save and close file DUTLIST.
It is necessary to make a copy of file Tds640a.con, and name the copy Tds640.con
Also, make a copy of file Tds640a.idx, and name the copy Tds640.idx
It is not necessary to edit either file copy. With these steps, I have successfully calibrated a TDS640 on the first attempt.
RF+ Tech