I'm a bit unclear of what would be best for my situation. I need a 3' male BNC to male BNC, a 3' male BNC to banana plugs, and a 3' male BNC to alligator clips. Not to hard to find BUT I need the best in keeping out external noise as these will be hooked to multiple highly sensitive to noise test equipment pieces (one being a pico-ammeter) in a relatively electrically noisy environment in a research physics lab. Picoammeter had a BNC to alligator clip test lead that if you twisted it would generate a current and cause the meter to go haywire up into the mA range amazingly enough. I found an old RG59 cable and soldered clips on it and appears to stay relatively steady in the nA range which is acceptable. So whats out there for sensitive stuff?
I then just need some basic male BNC to male BNC for classroom use by students - hooking basic oscilloscopes to function generators etc. Those I figure basic ol RG59 cable and ends would work (monoprice has 3' for $1.60 each which is great because i need 24 of em!) I also need 12 basic 4' male BNC to bananas for the same environment.
First of all, you
don't want RG59 for test equipment... it's 75 ohm, and most of what you find is not very well shielded or constructed, since it's just intended for video use.
For ordinary lab use, Pomona 50ohm coax cables are good, but they just have ordinary shielding. (Of course if you are using banana plugs or alligator clips, the cable shielding is not really an issue.)
For critical picoammeter measurements, you need low triboelectric cable, which is expensive. Keithley is one source.
For your student lab, you could get the RG58 (not RG59!) cables from Monoprice, but they are quite a bit stiffer than Pomona, and the BNCs don't attach as easily.
Not sure about the BNC to bananas... most people use BNC-BNC with a Pomona BNC-banana adapter.