Having worked on the HP YHP product line for many years, the cable types were never identified in the manuals, but back then you could ask the service engineers that question. I never needed to ask.
Another possibility is to check the service manual parts list, find the vendor for the cable, then check their product line. What I would expect to find is that the cables are low impedance, low capacitance/ft (m). I would also guess them to be either 50MHz or 500MHz mini coax cables because that was readily available in the 1980¡¯s.
When YHP started making the higher frequency impedance analyzers - 4286¡¯s and up - the fixtures changed to accommodate the higher frequencies.
The switches for 1, 2 meter cable sets with fixtures were used to offset the cable compensations needed, the compensation range circuitry did not change, just the offset. Options were used to extend the ranges even further to 5 meters and more.
Compare this to the 3468 four wire measurement, but measuring not only the R, but including L, C, and Z.
I also remember using 50 ohm coax cable in the calibration of the HP 4192 Impedance Analyzer - 1GHz.
Don Bitters
