I have just started using the 2206 and upgraded to the latest software.
I was using the spectrum mode to check a phone line dial tone. The two frequencies detected were twice what I expected.
As a test I set the generator to 1KHz and the sweep to 5Khz and fed it to CHA. Again the scale showed a 2KHz main peak (and slight peak at 4KHz).
Changing to scope mode showed the frequency was indeed 1KHz as expected.
What am I doing wrong ?