Products > Test Equipment
Siglent SGD2042X rotary encoder poor performance
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joeqsmith:
Looking at the system info, it was shipped with the latest firmware installed.   
slavoy:
I also bought mine a few days ago. I repeated what you did in your video and my generator doesn't act that way. The only similarity is that it counts encoder pulses up to a certain speed. It should be more responsive. But it rarely goes back one digit. I have to turn the knob very quickly. Mine is also updated to 1062X from the tutorial on this forum and does not have the latest firmware. Perhaps that also matters or simply the encoder is broken.. I did the update practically right after the purchase.
brainwash:
Maybe only tangentially related: I looked inside a higher-end OEM car stereo unit and they had a separate 8051 handling the volume encoder. This was >10 years ago. At that time I thought that was needlessly complicated, but have been bitten a lot by shoddy encoder implementations.
I suspect that the software polls (instead of using interrupts) the state and this tested fine while there were no features in the device. Once you start adding features, the encoder check loop doesn't run as often and you get missed pulses or reversal. Or maybe they are using interrupts which are being preempted by other ones.
joeqsmith:

--- Quote from: slavoy on March 22, 2022, 05:03:05 pm ---I also bought mine a few days ago. I repeated what you did in your video and my generator doesn't act that way. The only similarity is that it counts encoder pulses up to a certain speed. It should be more responsive. But it rarely goes back one digit. I have to turn the knob very quickly. Mine is also updated to 1062X from the tutorial on this forum and does not have the latest firmware. Perhaps that also matters or simply the encoder is broken.. I did the update practically right after the purchase.

--- End quote ---

When you have no quality control, I expect the products will not behave the same.  I'm surprised that they wouldn't have caught it during the final functional test.  Maybe they skip that step.  Also possible, that what I show is considered acceptable to them.   

From my own perspective, I expect test equipment to work out of the box.  There may be some bugs but I expect the basics to all be solid.  This encoder is pretty much the cornerstone of the UI if I were to use the unit standalone.   I didn't spend any more time looking at the unit because of this one problem.  The thought that they couldn't even get this right doesn't give me a lot of confidence in the rest of the design.   
TurboTom:
SDG6000X shows the same crappy encoder behaviour. Even at fairly moderate speed (i.e. thumb and index finger controlled rotation), it shows occasional "hickups". Fast turning results in unpredictable counting results, even reversal can be observed, just as Joe pointed out.  Since my "instument under test" has about three years under the belt, I cannot tell for sure if its performace was as poor as that right from the start but I remember I've never been to amazed by the U/I's look and feel, partly related to the encoder...
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