I did a little bit of testing this morning with different cables and setups. I also wanted to see if there was much of a difference between Channel A and Channel B on my 4920.
I wanted to stick with the same nominal of 100 mV @ 1 MHz for this test. I rounded up 6 different cables to use. I plan on getting the twin-axial Belden 8719 here in the future to make some cables with. That will be thrown into the mix as well
1) 40 GHz RF/Microwave cable with necessary connectors.
We have several of these high quality M/A COM serialized RF cables that I wanted to try. They seem to have yielded the best results. But at what frequency would you start using this? And at what voltage would you stop using this?
2) Solid Core Silver Plated Copper Twisted Pair.
The materials for this cable is from JSwilley and I hand made it myself. I really like these cables and I think they turned out fantastic! It is somewhat of a nuisance getting the cable onto multiple bindings, though.
3) RG213 N-Type
This cable came with the 4920M we purchased recently. The Pomona N-type => Banana adapter came with it as well. I really like this cable and it seems to yield pretty decent results.
4) MultiContact Low Thermal Gold Plated Banana Cables
These are some really good single banana cables. I use these for a lot of applications. They were given to us by Jay Klevins from Ohm Labs when we purchased our 2 standard resistors.
5) Pomona 5291A-60
I despise the retractable sheath cables... they slowly push the banana plug out of the jack. This particular pair is too long for my liking. The insulation is also PVC, which I don't think has as great of electrical/thermal properties as PE or PTFE (Correct me if I'm wrong).
6) Pomona 2BC-60
This is a pretty good higher voltage AC cable. It did yield high results compared to other cables, however. This one is also a little too long for my liking.
I have attached 3 recent calibration certs with the reported 100 mV @ 1 MHz value and the data reported from Fluke for the 4920. Which cable, in your mind, performed the best? So far, I'm liking the measurement results with the 40 GHz RF cable. I only wish they could withstand a higher voltage