Hi Jidis,
The distortion spec is on most of the frequency range below 0.8% and you can tune the distortion in de audio range for a big part to about 0.5 a point 0.6%.
Depending on de XR2206 you have at the moment.
I cant remember reail noise issues and just measured one of the generators.
It is not difficult to get the distortion below 0.6%, but if you make the sweep range to big say from 500Hz to 35Khz, you never get this low distortion figure over the whole range.
Look @ the pictures below, the distortion was of no big inportance for the use of this generator (Build in a old Cico Pix firewall housing)
How one of the generators is build.
1KHZ distortion, its a little high but thats because i used a big range for this generator.
Analyzing the 1KHZ distortion.
10Khz, and now the distortion is better because we are in the middle of the frequency range.
Analyzing the 10KHZ distortion, now we have a neat distortion figure for a XR2206
Kind regards,
Blackdog