Electronics > Beginners
Oscilloscope viability
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davelectronic:
It's for hobby use, and mainly to look at power supply noise and ripple. And only because some psu smps that is, are unsuitable for powering RF radio and related equipment.  Up until now I've just tried moded IT including server units to see if they cause interference. A closer look at the output under load with a scope would be very useful.  Yes I've seen Dave's video on how to measure output noise and ripple,  and where his probe lead picks up noise from his led lighting. So that was very informative before I attempt this procedure.
As I only plan to use the scope for looking at output noise, I'm unsure on the lowest mhz scope that will do this procedure. I have very little spare space, so a compact scope would be ideal, something I could pack away between uses.
AndyC_772:
Switched mode power supplies tend to produce the worst of their emissions in the form of fairly broad band noise in the 10-50 MHz region, so a 100 MHz scope will show you most of what's there to see. You may want to look at a scope with FFT capability too, if your main interest is in the frequency domain.
davelectronic:
Yes that's it really, what frequency is any noise coming from these hacked psu units under load. Anything that causes problems with RF equipment is of no use for my purpose. Unless additional filter network can attenuate the noise that is undesirable. It's not knowing the what the output noise is, under load that makes using such power supply possibly undesirable. Knowing the worst case noise scenario would be a great help in knowing if it's worth perusing a moded psu for RF uses.
rstofer:
With the 100 MHz unlocking of the DS1054Z, you will  be able to faithfully reproduce a 100 MHz sine wave.  But you will be able to see 'trash' well above that frequency.  In fact, the unlocked 100 MHz turns out to be 130 MHz before the trace goes -3dB down.  Tested by others...

That still wouldn't prevent you from seeing 'something' at a couple of hundred MHz or more.  300 MHz probes might help.  50 MHz probes won't help!

Things get pricey when you move beyond 100 MHz.  The Siglent SDS 1204X-E is nearly $800 for a 4 channel 200 MHz scope.  I have read that the 100 MHz version, the SDS 1104X-E can be unlocked to become the 200 MHz version.  Details over in the Test Equipment forum.  The 1104X-E is only slightly more money than the DS1054Z but is probably outside your desired price range.
stj:
i saw a guy on utube testing the rigol, he got a good trace all the way up to about 350MHz!!!
only downside, all the onscreen readings went to shit - but the trace was fine.

this was using a signal generator that was probably putting out 1-3v, so i dont know how much the sensitivity dropped off though.
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