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In Reply to: RE: Has anyone ever used a Rhode and Schwarz audio analyzer? posted by Michael Samra on March 17, 2015 at 19:22:58
Does this do two-tone testing? I don't see IMD specifically labelled on the panel. Michael, you do realize it's possible now to do every kind of test imaginable with a PC and an interface box? Just saying, unless you're a test equipment collector, these things might not be the most cost-effective solution for testing your gear...
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With the PC it's a PITA when you want to check power because you have to pad it because most sound cards only take 2 to 2.5v input.Can you read directly in on yours with the interface? It will do the two tones for IMD but who measures IMD anymore? You can usually find all necessary distortion product in the sweep and with THD and then you can interface these to a PC to look at the graph or print it out. Since the the audio analyzer started measuring THD to 4 and 5 places along with ability to see a flat response,they didn't seem to stress IM so much after that.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Edits: 03/17/15
"With the PC it's a PITA when you want to check power because you have to pad it because most sound cards only take 2 to 2.5v input."
Michael, nothing could be easier. My interface box uses a simple 100k dual pot for this. I just turn it until the card has a useable input level. The card will accept up to 4V rms, so anything under 2W/8ohm is essentially a direct connection anyway. At higher levels, I just turn down the pot. I can also test high-swing driver performance at the grid of a power tube using a 10:1 scope probe. Really, it's all extremely quick and much less time consuming than many of the distortion analyzers I've used in the past.
"who measures IMD anymore?" Lots of people, including me. IMD doesn't always follow THD. It's an important test if you want the whole story about an amplifier's electrical performance.
Now, if you said the Roadie could measure TIM, I'd be sold. Otherwise, it's just another bench warmer. :)
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