| Electronics > Beginners |
| Psu ripple and transients, oscilloscope question. |
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| davelectronic:
Looking for some advice please, can a 20mhz crt scope be used to view both linear and smps output ripple and transients ? I have a crt 60mhz scope, but wandering if a 20mhz crt scope will be sufficient. Thanks for any help with this question. |
| bd139:
It can. Typical 5x the bandwidth of the signal you want to look at is about right to catch harmonic products so that’d limit you to about 4Mhz SMPS switching frequency. Rise time is usually more important though. 50MHz is about as low as I’d go these days. |
| davelectronic:
Thanks for your help, ok i see. I've got a lot to learn about oscilloscopes and there use, also setting it up right for the task. I really wanted to see the ripple elements of IT power supplys that have been converted for bench use etc. And output of buck and boost converters, when used with repurposed power supplys from power adapters and server power supplys. Typically example would be 19.5 Volt 11 Amp hp power adapter, using a buck converter. For HF Radio use, as the power has to be reasonably clean and free from high levels of electrical noise at the output. |
| bd139:
Ah yes. Makes sense. I'm staying low power with my HF setup after arguing with a POS MyDEL supply which puked all over 20m. Allows you to keep it linear, cheap and small! |
| rstofer:
Anytime I see "SMPS" and "oscilloscope" in the same sentence I cringe and hunt for Dave's video on How Not To Blow Up Your Scope. I realize now that you are working at lower voltages and not mains powered SMPS designs but, nevertheless, here is the video: |
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