Hello,
This forum has really helped me on choosing which oscilloscope i need and why. Till now, i was just reading without being registered but i want to ask some questions about the use cases for the oscilloscope i'm planning to order and if they fit the capabilities of the oscilloscope.
I am looking around for a new USB DSO oscilloscope of around €100's. I found that there are 2 real options in this segment:
-Hantek 6022BE
-Owon VDS1022(i)
The Owon seems to be the better choise of the pair. My use cases for the scope are mainly:
- Audio equipment repair (so no high frequency signals)
- Power supply ripple/noise measurements (somewhat higher frequency signals)
I think that the Hantek isn't really suitable for the second use case, the Owon scope is the only choise then. Altough it's memory of 5k samples is very small, it should be enough for short shots of ripple/noise measurements and somewhat longer shots of audio signals.
The 100MSa/s rating should be enough for the use cases, with such small memory you can't really get shots with 100MSa/s precision. I also looked at what JonnyGuru uses as a scope to measure noise/ripple and that is a TDS2012B with just 2.5K memory. When he makes shots of 25ms (from what i can see on his reviews) the amount of samples per second reduces significantly. So the 100MSa/s of this scope in combination with 5k memory should be enough to look at ripple/noise of switching power supplies. Am i right?
The second thing is that the bandwidth of the Owon scope is 25mhz. To measure ripple, you officially have to look at the 20Hz-20Mhz range of the output. The bandwidth of the Owon scope should be good enough, but i can't find any information about a 20Mhz filter for this scope. Are there like external 20Mhz filters? Or can i build one myself? Do i actually need it with this scope?
And the third thing is that a differential probe is the best option to measure ripple/noise on switching power supplies. But the Owon 1022i already has isolated channels, so then i can just measure with a regular probe right? Since the ground connection is floating on this unit. This would save me the additional costs of needing an expensive differential probe.
This is what i understood when i was browsing the internet for like a day or 2. Are my assumptions right? Am i missing some (important) aspects?
