EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: qqwasder on February 11, 2018, 07:38:18 pm
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Using the manual, I can't seem to figure out how to solve the following:
- The signal consists of repeated packets of pulses with about 50ms between packets
- Each packet contains about 1000 1us pulses
- The main information is encoded in the number of pulses in each packet (which I am trying to determine)
While I can easily display an individual pulse packet and its included 1us pulses, I can't figure out how to configure my Rigol 1054Z to consistently count the individual pulses in a in a given packet. If I capture a packet, then adjust the time base to show, say, 5 1us pulses, the counter shows "5 pulses". as I lengthen the time base the displayed waveform shows more and more 1us pulses and the counter increases accordingly. But as I continue to increase the time base, the counter seems to top out at 528 pulses. If I lengthen the timebase 1 more time, the counter drops to 412. If I display the entire packet (its just a blur by this time), the counter shows "108 Pulses". It seems like there an upper limit to number of pulses the scope can count (or a minimum interval between pulses). Any insight would be appreciated.
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I fear that the rigol can't do what a real counter do, AFAIK it's a software feature that counts only what's on the screen "looking" a the waveform and it's not very precise. It counts well only when there are few pulses with a well defined shape. Maybe I'm wrong, but I think that in your case it should be mandatory to use a proper counter.
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My understanding is that with the exception of FFTs, the Rigol only makes measurements of the display record which limits it to something like a 1200 point record length so pulse counting will be very limited.