I have been studying and working with an FG 502 function generator. I recently went through the adjustment procedure and was able to do everything that did not require a distortion analyzer or spectrum analyzer. Actually I did those adjustments too but eyeballed the sine shape and used my best judgement as what gave the best appearance.

I am not convinced it is operating properly though. I uploaded three picture and perhaps someone who has experience with this unit can tell me if this is as good as it gets or if there is an indication of a fault or two somewhere.



The closeup of the sine shows (barely) that it appears to be composed of a number of signals closely bunched together.

The low frequency square shows that there are a number of tops stacked upon each other. This does not appear at high frequency.

Finally, the closeup of the high frequency square shows what it looks like at high frequency.

I also am unable to adjust the 20V power supply below 21.9 V. I replaced one cracked resistor on the front end of the power supply and am continuing to troubleshoot that problem.

Thanks for any insights.

Phil...