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I've looked around this site but I haven't been able to figure out why this oscilloscope seems to have such a high sampling rate "Repetitive mode: 20GSa/S" and be relatively cheap: http://shop1.usbdso.com/MSO-9201-with-Logic-Analyzer-MSO-9201wla.htm

Can someone explain?

Thanks

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1 Answer 1

up vote 6 down vote accepted

This is for a repetitive signal like a standing sine wave.

When I buy a scope I always look for is the real-time sample rate which indicates the maximum rate an incoming signal can be acquired in a single-shot acquisition. On the other hand, repetitive sample is a method of reconstructing a signal based on a series of triggered waveforms that are each acquired in single-shot mode. The advantage of repetitive mode is that it offers a higher effective sample rate. The downside, however, is that it takes more time and is applicable only for repetitive signals. This scope has a real time rate of only 200MSa/s - far from the 20GSa/s.

In general I hate using PC based oscilloscopes and would tell you to go for something like this instead if you're in the market for a scope to use. Unless you are really strapped for money and need the 200MHz bandwidth or really need the deep sample rate.

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1  
Also called equivalent-time sampling. –  user36129 Mar 31 at 9:15
    
Hi Gonzik, what does the equivalent sample rate mean in the following link? rigolna.com/products/digital-oscilloscopes/ds1000e –  david Mar 31 at 21:19
    
Equivalent-time and repetitive sample are the same thing as pointed out by user36129 above. –  Gonzik Apr 1 at 4:00
1  
Short version: Lies from the marketing department. –  John U Apr 1 at 7:39
    
Ok now, I get user36129. Thanks everyone for your help! –  david Apr 1 at 13:08

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