Oscilloscope bandwidth...

[cmos babe]

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

 

[VVV]

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.

 

[dog1357]

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]

you can use a oscilloscope with 20mhz bandwidth.

that's enough.

best regards

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

 

[cmos babe]

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]

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.