FG 100 DDS Function Generator Testing A function Generator that $19 bucks

Testing a newer revision of the infamous FG 100 function generator. Testing to see of usable. Testing to see if it as bad as people claimed. Turns out very usable and no crossover distortion.

[@lohikarhu734]

@lohikarhu734
9 minutes ago
I see a straight cable connection to the scope...makes me a bit nervous about impedance match, or compensation....I set to 1080p, and looked at the scope settings, and that input is set to 1 M Ohm! With a straight cable, you have no compensation at that input, so the square wave and higher frequencies are not reliable...you should put a reasonable load on the generator output, like 1 k Ohm, and ise your scope probe, properly compensated!
With this setup, all bets are off for clean waveforms!
Can't blame the generator if the scope probing is incorrect ...
I know itps a pain in the neck, but maybe you could redo the >1 kHz, and edit that in.
(BTW, in case someone cares, I've been a senior scope (and other) AE at Tek, Agilent and R&S)

[@thetechgenie7374]

I tested it with also impedance match towards the end of the video with a 50 ohm terminator and also did a separate test with the scope internal 50 ohm terminator. Only did the 1 M ohm impedance at the beginning but performance didn’t change much when loaded correctly.
Yes your correct with no compensation capacitor you get harmonic loss at higher frequencies. I did this on purpose but I did load it at the end I did three separate tests in video. This generator prefers a higher impedance as if loaded to much operational amplifiers start to clip but is fine for audio.
Actually function generator performance was decent and did better than expected. What I did fail to do was do the 1 k ohm and 50 K ohm loading as most will be using this likely for audio and most decks when doing calibration requires a 50k ohm especially Pioneer reel to reel decks and etc. I actually have cables made with the resistors, just forgot to. I may revisit this generator and use it for a calibration loaded and compensated correctly as have a few Pioneer decks have to service.

[@lohikarhu734]

I see a straight cable connection to the scope...makes me a bit nervous about impedance match, or compensation.