The 90k embedded in the logic probe tip makes a voltage divider with the 10k input impedance of the scope's logic inputs, so the combination makes a x10 probe. And the woven ribbon is a lossy transmission line, similar to a regular analog probe cable, to maintain signal integrity.
A cheap straight-thru 40-pin ribbon connector will give you the wrong voltage levels, and also would degrade the signal integrity if you're dealing with high speed signals. Not to mention expose the digital front end to more risk of damage, as you point out.
I would get the genuine cable and probes, even if it's somewhat pricey. The 54620-61601 is what was supplied by Agilent/Keysight when I ordered a 3000X with the logic option several years ago.
Oh yeah, absolutely, I agree with you all 100%. Definitely buy an official HP/Agilent probe set, don't buy some 3rd party knockoff. For the cost of these scopes, it makes no sense to cheap out on the probe tips and wreck the input logic.
But just shop around and find a used set or even new set on ebay or here, and pay 1/6 of the cost! I just wanted to emphasize to NOT buy it direct from Agilent, and pay $600 or more. No need for that nonsense. You can buy an entire scope for $600! (lol, NOT one of these scopes, but maybe a Rigol
)
I got the 54620-61601 MSO probe set for my 3024A from ebay, it was new still in package, for $120....
I'm just curious if anyone actually located where they have this probe resistance at, as someone already disassembled one of the pod modules, and there was nothing in it at all...maybe it's in the 40-pin IDE header, as I don't see any pics of anyone opening that up?
https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg367778/#msg367778Also, btw, the newer/replacement probe packages do not have that braided cable as the older ones did, it's just straight up wire...