Right away on power up, the distortion analyzer's display didn't come up but the function generator's did. I remembered from looking over the manuals online that each of the bays in the Hameg frame have their own power supplies because the plugins can program the voltages on some of the rails and that could differ from bay to bay depending on what the plug-ins in each specify. I decided to swap the distortion analyzer and function generator to see if the problem followed the distortion analyzer or the rightmost bay and its associated power supplies were at fault. When I removed the distortion analyzer plug-in, I saw this great BCS Electronics sticker on the top. It looks like BCS Electronics is long gone from what I can tell by searching the internet. I didn't try sending a Telex to that number at the bottom but one magazine ad from 1985 does show them carrying Hameg equipment.



The distortion analyzer came up in the left bay so I started testing it out. I was able to tune in the frequency adjustment and set the level, then go for a THD+N measurement and it's overstating the distortion from my 8903B's signal generator.

On the other hand, it can't detect any distortion in the output of the QuantAsylum QA403 whose output is very clean.
I shut down the frame and swapped the plug-ins back in order to try out the function generator. Unfortunately, with the dead bay, going from the function generator to distortion analyzer isn't going to be possible right now. Instead, I hooked the function generator's output up to the 8903B and QA403.


Adjusted to 1 kHz according to the Hameg, about 1 V RMS according to the 8903B.

Change the measurement on the 8903B to distortion and wow. 0.818%

This is the Hameg function generator's sine output seen on the QA403 and it's awful. I actually started laughing at how bad it was. I realized later when I was showing the pictures to a friend that the pictures actually show a good example of how a sine can look perfectly good on a scope despite being loaded up with all kinds of distortion that's only visible on frequency domain equipment. I also realized I didn't test any of the other waveforms the function generator can produce either. I shut everything down and met the friend for dinner after seeing how bad the sine output of the function generator is without testing it further.
Right now, I'm on the fence between taking the cover off the frame and seeing if I can find what's wrong with the right bay or clearing the bench off and putting the Amber on it tomorrow.