Electronics > Beginners
Oscilloscope Bandwidth Question
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jlam:
Hello Everybody first post.

I am a looking to buy my first Oscilloscope for Audio Repair and Mod Work.

My goal is to work with 55Mhz to 100Mhz maybe even 300Mhz Opamps and check them for Oscillation and do some Synth Repair work too.

Because the the Opamps will be using feedback capacitors set to roll off just above in 200KHz to I need 100Mhz or 300Mhz bandwidth?

Also is a Dual Trace scope enough for this type of work? Or should opt for a 4 channel scope?

Thanks in Advance.

 
TK:
The Rigol MSO5074 might be the best option for you... 4 channels, can be hacked to 350MHz with tons of features.
0culus:
I'm confused...even 55 MHz is way above audio ranges....  :-//


Anyway, one way to think about it is to consider the possible harmonic content of your signals of interest. If you care about looking at non sinusoidal waveforms, they often either are made up of odd or even harmonics. If those harmonics aren't within the analog bandwidth of your 'scope, the scope simply won't see them and the waveform you get will likely not resemble what you think it should.
jlam:
Lol true.

I think that refers to unity gain bandwidth. Even the lowly TL072 has a 10Mhz bandwidth.
bdunham7:
You might just want to start with a basic older analog scope since even the lowest bandwidths will be more than adequate.  I don't know your market there, but here I've picked a few up under $50 that would be more than suitable.  I don't see why you would need 4 channels or advanced features at this point.
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