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Query about 80000 series and 90000 series oscillosocpe
Question asked by
on May 24, 2008
on Jun 6, 2008 by pvssreddy
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Does it possible to measure 400ps rise time in any of the Agilent oscilloscopes and the sampling rate should not be less than 18Gsa/s.
Does it possible with DSO80204B or DSO90254A?
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May 29, 2008 1:05 PM
The DSO80204B and the DSO90254A oscilloscopes can definetly measure a 400ps rise-time signal.
Here is a good way to look at sample rate to BW:
First determine whether you are using a Gaussian- or flat-response oscilloscope. Then, depending on the accuracy you need, select the appropriate multiplier and multiply the maximum signal frequency (Fmax) by the multiplier to determine the required oscilloscope bandwidth.
Finally, ensure that the oscilloscope has sufficient sample rate to achieve the required bandwidth without sampling alias errors.
For example, to measure a 400 ps rise-time signal (20 to 80 percent) with a flat-response oscilloscope to an accuracy of 10 percent would require a (0.4 /400 ps )1.2 = 1.2 GHz
bandwidth oscilloscope, with a minimum sample rate of 1.2 GHz x 2.5 = 3GSa/s.
For example to measure a 400ps rise-time signal with a Gaussian response oscilloscope to an accuracy of 10% would require a (.35/400ps)1.3 = 1.137GHz bandwidth oscilloscope, with a minimum sample rate of 1.137GHz X 4 = 4.55GSa/s
Determine maximum signal frequency (Fmax) 0.5/Signal rise time (10%~90%) OR 0.4/Signal rise time (20%~80%)
Determine oscilloscope response type Gaussian-response Flat-response
Rise time/bandwidth relationship 0.35/bandwidth (0.4~0.5)/bandwidth
Rise time measurement error Oscilloscope bandwidth
20 % 1.0 Fmax 1.0 Fmax
10 % 1.3 Fmax 1.2 Fmax
3 % 1.9 Fmax 1.4 Fmax
Minimum sample rate 4 x bandwidth 2.5 x bandwidth
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Jun 6, 2008 5:07 AM
Thanks 4 ur reply.
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