I am having a problem with my QA401 software. When I run a test using the AMP THD VS Frequency plugin and select the THD + N setting with a start frequency of 10 Hz and a stop of 20 kHz I get plot that graphs the result to the full bandwidth of 20 kHz. When I preform the same test but do not select THD + N the graph result stops at just below 10 kHz.
This problem started at some point a couple of months back when I upgraded to the latest version of the software. I have de installed and reinstalled the software but still have the problem. Any suggestions?
The traces in red and black were done with THD+N and the orange and green traces were done with just THD. No other changes made.