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| Need help! Test bench equipment recommendations. $2k+ budget |
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| egonotto:
--- Quote from: kcbrown on April 01, 2022, 09:01:09 pm --- --- Quote from: nctnico on April 01, 2022, 08:36:13 pm ---Nowadays you can buy decent differential HV probes for less than $200 (the ones from Micsig for example) and sometimes good deals come along as well. --- End quote --- ...... Getting good bandwidth and 10X signal reduction is going to cost you, near as I can tell. Examples to the contrary would be welcome. --- End quote --- Hello, perhaps Micsig DP10007 https://www.batronix.com/versand/messtechnik/tastkoepfe/Micsig-DP10007.html Best regards egonotto |
| bdunham7:
--- Quote from: kcbrown on April 01, 2022, 09:01:09 pm ---Getting good bandwidth and 10X signal reduction is going to cost you, near as I can tell. Examples to the contrary would be welcome. --- End quote --- Don't forget CMRR and noise. The Sapphire-built probes are still a decent choice, the EEVBlog one is actually a good deal at $450 AUD. |
| kcbrown:
--- Quote from: kcbrown on April 01, 2022, 07:24:37 am ---If the original encoders weren't working then this is exactly what I would do. Swapping A with B is sufficient to yield the desired result. But it appears that won't be necessary. --- End quote --- Well, this turned out to be wrong. I put the original encoders back into play and the issue with the scope missing my inputs returned. So it is the encoders, but it's not that they're not generating output. This can mean only that the encoders aren't reliably generating pulse widths wide enough, or enough time between A and B, to make it possible for the scope to reliably recognize that the encoder has been moved. I suppose it's possible that the internal impedance of these encoders is just high enough to ride that threshold. I'll have to measure that. So now I'm going to try reverse the pins on the replacement encoders. This is not easy to do with the amount of room that's available. It's finicky work. I'll post another update once I've completed that work (the scope is apart at the moment). To those who have an SDS-2kX+: if you've got the waveform up on the screen, and you turn the timebase encoder one detent, does the scope reliably see your input? Mine doesn't with the original encoders but does with my replacements. If yours doesn't, then we have a more widespread issue than just mine. |
| bdunham7:
--- Quote from: kcbrown on April 03, 2022, 05:15:06 am ---Mine doesn't with the original encoders but does with my replacements. If yours doesn't, then we have a more widespread issue than just mine. --- End quote --- Mine responds to each and every click of the knob unless I turn it very quickly, so quickly I can't keep count. I can adjust it 10 clicks one way nd then 10 back with my eyes closed and it ends up where I started. I find that the best way to describe Siglent UI and encoders is that I tend to carefully watch the instrument as I change the settings--it isn't one of those you can reliably do quickly or by feel. However, I can not find any of the complained-about defects in any of my instruments and the SDS2104X+ seems solid to me so far. |
| kcbrown:
An update: I installed my replacement encoders with the outputs cross-connected (this was annoying to do. I'm fortunate that I had silicone-sheathed wires to do it with) and it works a treat! Unfortunately I forgot to get pictures of it, but I do have an encoder that I used to test the idea with and I can take a photo of that if anyone's interested. There's relatively little space to play with because the buttons are fairly close to the encoders, so I had to minimize the wire length and ensure that the wires had sufficient insulation to not contact the common pin and ensure that they were short enough to stay within the allowed volume region for the encoders. --- Quote from: bdunham7 on April 03, 2022, 06:31:41 am ---Mine responds to each and every click of the knob unless I turn it very quickly, so quickly I can't keep count. I can adjust it 10 clicks one way nd then 10 back with my eyes closed and it ends up where I started. --- End quote --- This suggests that Siglent made a hardware change. It would be interesting to know if your encoders are the same as the ones that were originally in my scope. I suspect not. Opening the scope enough to get to the encoders is more trouble than it's worth, though, even if yours happens to be out of warranty, so I can't exactly ask you to check. :D With my replacement encoders in place, my scope behaves as yours does. So this is very definitely an encoder issue, and very definitely not an issue with the solder joints or any of that. The fact that both of the original encoders show the same patterns on the scope means that this isn't a production defect in the encoders, but a design defect. I'll play with them and see if I can characterize them better. Maybe something will stand out as faulty once I post up the various waveform characteristics of them. |
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