Would anyone like to validate my crossover distortion measurement ? See the attached photo.
I have set the FG to generate a 2.3kHz 5v triangle wave. I'm not sure the exact frequency or voltage matters, it's just what I was working with at the time. Ive seen in on Sine, and other waveform setting too. As mentioned earlier, overall, the wave forms look quite clean. And a few post back someone even measured the hormonic distortion levels. But if you zoom WAY in, you can find some crossover distortion.
The four pictures are of the same function generator setting, just zooming into the zero volt crossing on my oscilloscope.
![](https://www.eevblog.com/forum/testgear/feeltech-fy3224s-24mhz-2-channel-dds-aw-function-signal-generator/?action=dlattach;attach=221310;image)
1st photo, upper-left: you can't see any crossover distortion. I've circled the area in red. (BTW, it happens at every zero-crossing, leading edge and training edge, though I've only circled one of them.)
2nd photo, upper-right: It's just barely starting to become visible. I'm not sure the photo will show it, but again I've circled the area in red.
3rd photo, lower left: Zooming in further. The crossover distortion is clearly visible as a zig-zag. We're also starting to see the quantization artifacts that all DDS function generators exhibit.
4th photo, lower-right: I'm fully zoomed in. The zig-zag at the zero crossing is measured to be roughly 1 division = 5mV. You can see some ringing too. However I'm not sure if that is coming from the function generator, or my setup. I did terminate the BNC cable with a 50ohm load to minimize cable reflections.
I'd be very curious to know what similar measurements look like using a high-end function generator.