Hello!
Unfortunately HP cancelled the distribution of the software extensions for some network analyzers like 8752A, 8752B, 8752C, 8753A, 8753B, 8753C, 8753D.
Formerly there has been disks with a numerical password (which was calculated from the S/N of the unit) to enable software extensions like TDR measurement.
Has someone a collection of the disk images and the algorithm to calculate the password number to install them?
Especially of interest are:
HP 85019A (Opt 010: TDR for 8753A)
HP 85019B (Opt 010: TDR for 8753B and 8753C)
CU