DR #43 - B&K E200-D RF Generator Service, Modification, and Testing

This is my first experience with an RF generator. In this video, I complete some minor service and modifications and perform general testing & alignment.

[@poormanselectronicsbench2021]

It's apparently not the case on that unit, but with some older RF signal generators, you will find that, they do not generate a pure sine wave, and, they use the harmonics to reach a higher frequency, disregarding the fundamental frequency and just downgrading the db output for the higher frequency harmonic being used. For that harmonic issue in the High range, I'd check the low value caps C3, 4, 5. as they are most likely going to cause an issue with higher frequencies if they drifted out of tolerance. Also, don't neglect to put in proper X-Y rated caps for C49 thru 52, and consider re-wiring the line fuse and switch circuit components to the line side of the power cord, and have the neutral as a direct connection to the transformer.

[@AxelWerner]

Outcome looks MUCH better than what we started from. Looks like a WIN to me for what you have on hand. :3

[@kruskotv1311]

I just want to say I love your fkin channel, its amazing.
Youre calm, collected, explain well.
Please keep doing that, I learn so much from you and you're awesome to listen to and watch

[@dualityrepair4770]

Thank you so much Krusko TV.

[@EriksElectronicsWorkbench]

Good video and looks like a very nice RF generator. Your distortion at certain frequencies, and the signal amplitude not going as low as you thought it should, is because the scope is a high impedance (1 meg ohm) input and the RF generator is made to work into a 50 ohm load. You should use a 50 ohm pass through terminator before the scope -or- set the scope to 50 ohm input if it allows for that. The high impedance of the scope effectively causes standing waves on the RF cable which causes the distortion and the lack of 50 ohm load allows the generator's output amplitude to remain higher than it would when loaded. On that TDS scope consider replacing the switchmode power supply caps, they are known to leak.. mine had failed/leaking caps in it.

[@dualityrepair4770]

Thanks so much for the info. I’m using a cable with an impedance of 50 ohms, but no pass-thru connector. I’ve never claimed to know everything and I’m glad there are people like you out there who can help.

[@EriksElectronicsWorkbench]

@@dualityrepair4770 You're most welcome :) The 50 ohm cable is perfect, just needs the termination. btw I've enjoyed your videos and found them helpful and interesting. -Erik

[@kennethiman2691]

Where did you find the 12.5uf 25v axial capacitor?

[@tomjammin]

Parallel a 10uf and 2.2uf. These are common.