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Why expensive NI DAQ only have data rate of few million while cheap digital oscilloscope has sample rate of 1G?

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Right now I am working on a NI DAQ based oscilloscope on Labview, I understand the difference between continuous data acquisition and triggered data acquistion, but still one burning question. 

 

Why expensive NI DAQ only have data rate of few million while cheap digital oscilloscope has sample rate of 1G? For instance, the Tektronix TSD educational oscilloscope claims to have a sample rate of 1G, and it is so much cheaper than NI stuff. Pls enlighten me!

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Accepted by topic author BaiLiping

Did you compare the number of channel?

Benoit

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Not only just the number of channels, but also the accuracy in terms of the number of usable bits.  That TDS oscilloscope has 9 bits while the DAQs are in the 12 to 16 bit range.  More bits = more accuracy.

 

Also a general rule: faster = less accurate.


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