Hi,
So we've got a Rigol DS1054Z and a Siglent SDG1025 to work on some Audio things with. Now these units both have BNC's on the front panel's. I know test gear likes to work at 50 ohms impedance, but I'm not sure how to integrate it with our world. So the reference impedance for Balanced Audio is 600 ohms, and the output impedance is usually lower (down to around 100 ohms) and the input impedance higher (usually 600 ohms - 10k) which means the signal gets driven from the output to the input.
I believe the 1054z can be "Switched" to terminate the input to 50 ohms, but otherwise if very high (1 million ohms or so). and I believe the signal generators get a few more volts (unto double) available to impedances above 50 ohms compared to driving 50 ohms.
so everything should be fine?
but what cable to I use (or doesn't it matter)? should I just buy some thin 50 ohm coax leads and put XLR's (or TRS Jacks) where required? does it matter if it's 50 ohm or 75 ohm?
And as both the signal gen and scope are "Unbalanced" I assume I short pins 1 & 3 (the inverted and the shield)?
and if I wish to terminate the input of the scope to 600 ohms, i'd just place a 600 ohm resistor across 2 & 3 (Non-Inverted and Inverted)?
I also will need to have a meter in parallel with my scope inputs sometimes - BNC "T" piece to split it? BNC -> Banana plugs into the meter?
Our HP Audio Sine generator has Banana plugs out and a pair that says 600 ohms. How do they work (they're the ones I've always used). they look like their floating from ground (there is also a ground point) so do I wire that as though it's balanced? (shield to shield, 2 to hot, 3 to cold).