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Oscilloscope bandwidth...

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cmos babe

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I need a cheap oscilloscope to monitor audio signals ,digital clock,i/o pins ,Infrared stuff..etc ..what's the minimum bandwidth i should look for?

thanks :D
 

VVV

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The only thing that is not clear from your esplanation is the frequency of the digital clocks. These can be very fast.

Other than that, even a 1MHz BW scope should do it. But if you can, try to get at least a 10MHz one. Eventually, you will need more bandwidth.
 

    cmos babe

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dog1357

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en, a good oscilloscope in the past years can take 50,100,150MHz, just give a rough idea. The new machine should go beyond this.
 

power-twq

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you can use a oscilloscope with 20mhz bandwidth.

that's enough.

best regards




cmos babe said:
I need a cheap oscilloscope to monitor audio signals ,digital clock,i/o pins ,Infrared stuff..etc ..what's the minimum bandwidth i should look for?

thanks :D
 

cmos babe

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VVV said:
The only thing that is not clear from your esplanation is the frequency of the digital clocks. These can be very fast.

Other than that, even a 1MHz BW scope should do it. But if you can, try to get at least a 10MHz one. Eventually, you will need more bandwidth.


digital clocks can be very fast (faster than 100 MHZ) does it mean that a 100 MHZ isn't good enough to display them?
 

rfmw

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Yes, that's right. A 100MHz scope will show only a (distorted) 100MHz sinewave, when measuring a digital clock signal of 100MHz. If you need to observe the distortion or shape of the 100 MHz digital clock signal, you need at least a 1GHz scope.

And there's more. Measuring high frequency digital signals requires special probes, that is passive low-impedance probes, or active high-impedance FET probes.
 

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