[SI-LIST] Re: Question of taking measurement. Thanks.

[Bill Wurst <billw@xxxxxxxxxxx>]

Hi Peng,

The bandwidth requirement of the test equipment will depend on the 
harmonic content of the signal you are observing and the level of 
accuracy you require.  For example, if you are measuring a sinusoid and 
don't mind the observed amplitude being low by as much as 10-20%, then 
BW=2*f should be fine.  However, if the signal of interest is a 
square-wave, then your oscilloscope should have 5-10 times the bandwidth 
of the fundamental to observe a reasonable replica of the actual 
waveshape.  You must also keep in mind that when measuring fast edges, 
the observed transition time will be increased by the bandwidth of the 
instrument, and that transition times of cascaded systems add roughly in 
root-sum-of-squares fashion.  Your measurement technique (i.e., probe 
ground inductance, etc.) will also influence high-speed measurements. 
For more information on this subject, I would suggest the websites of 
Agilent, LeCroy, and Tektronix.

Regards,
     -Bill


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      /         billw@xxxxxxxxxxx         /
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    / Advanced Electronic Concepts, LLC /
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========================================================
Peng Ye wrote:
> Hi everyone,
>    
>       To get accurate results, the bandwidth of the oscilloscope must be 2X+ 
> of the signal. (Please correct me if I'm wrong. Thanks.) So if I know that 
> the bandwidth of my scope is not enough compared to the signal that I want to 
> measure, is that any way I can still get accurate results? (This may be well 
> discussed, but I have no idea about this as a new scope user. I very 
> appreciate any of your answer.)
>    
>       Thank you very much.
>    
>   Yours,
>   Peng
>       
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• Follow-Ups:
  • [SI-LIST] Re: Question of taking measurement. Thanks.
    • From: Ihsan Erdin

• References:
  • [SI-LIST] Question of taking measurement. Thanks.
    • From: Peng Ye

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