Hi,
I am hoping to use REW more with the Scope and RTA function, and I am getting confused as to how best to protect the audio interface and computer from high DC voltages along with AC signals. I have successfully used this with low level inputs but am cautious to look at more significant voltages. I had a thought that I might use a passive high impedance probe and patch this into an RCA input of my USB audio interface (https://www.behringer.com/product.html?modelCode=P0484) but others have suggested this would reduce the input signal too much. I want to see the ripple on my smoothing caps in a valve preamp at DC 680V and I want to look at the hum on signal valves that are also at 150-200V. Any ideas of best practice or if there is a 'standard' approach with this, I am also guessing a well selected capacitor would remove most of the DC, but I am hoping this is an already well trodden path?
I am hoping to use REW more with the Scope and RTA function, and I am getting confused as to how best to protect the audio interface and computer from high DC voltages along with AC signals. I have successfully used this with low level inputs but am cautious to look at more significant voltages. I had a thought that I might use a passive high impedance probe and patch this into an RCA input of my USB audio interface (https://www.behringer.com/product.html?modelCode=P0484) but others have suggested this would reduce the input signal too much. I want to see the ripple on my smoothing caps in a valve preamp at DC 680V and I want to look at the hum on signal valves that are also at 150-200V. Any ideas of best practice or if there is a 'standard' approach with this, I am also guessing a well selected capacitor would remove most of the DC, but I am hoping this is an already well trodden path?