The 7490 should roll back to 0000 after 1001. The 1010 code should reset the counter, I wonder if the output goes to 1010 if even for a few nano seconds while the flip flops are resetting? Or would the propagation delay of the output gates inside the chip prevent the 1010 code from reaching the outputs?
Date: Tue, 21 Oct 2014 10:23:29 -0700
Subject: [N8VEM-S100:5412] Re: Getting to know your logic analyzer
I would be tempted to use a 555 to drive a 7490 (or other counter) then to look at the counter outputs as well as the 555 clock. If it's a decade counter you would see a binary 0000 to 1010 then back to 0000 on it's outputs; this would be something more interesting to look at. You could set up various triggers to get a feel for how a trigger affects the samples; look at different sample depths etc.
The more you understand the logic analyzer (including it's limitations) the better you will be able to use it.
Mostly though make sure you're having fun with it as you learn how to use it. :)
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