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| Siglent SPD3303D review |
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| FrankBuss:
--- Quote from: djeans on September 22, 2013, 08:18:17 pm ---Regading the spikes: would a big capacitor help, something like 4700µ or so ? --- End quote --- I don't know. But meanwhile the support sent me a description how to fix it, with soldering and replacing some new parts inside (all standard parts which you can get at Digikey or Farnell). There were some inconsistencies between the parts I can see on the image they sent, and what they described in the repair text what I should use, but as soon as this is resolved, I'll try it and then publish the results here, and the description of the fix, if Siglent don't mind (they sent me a nice board screenshot from their CAD program with top/bottom side traces and annotations how to fix it). --- Quote from: djeans on September 22, 2013, 08:18:17 pm ---EDIT: forgot to ask: is this thing hackable? I mean that you get an S model with a simple hack? I can not imagine that they have build something different. --- End quote --- Maybe, but why do you need a higher resolution than 10mV/10mA? There are no separate sense inputs, so depending on the length of the cables and the current, the voltage at your breadboard might be off by several millivolts anyway, because there are no external sense inputs, and I don't know an application where I would need to set the current limit with higher resolution. |
| djeans:
--- Quote from: FrankBuss on September 22, 2013, 08:51:40 pm --- --- Quote from: djeans on September 22, 2013, 08:18:17 pm ---Regading the spikes: would a big capacitor help, something like 4700µ or so ? --- End quote --- I don't know. But meanwhile the support sent me a description how to fix it, with soldering and replacing some new parts inside (all standard parts which you can get at Digikey or Farnell). There were some inconsistencies between the parts I can see on the image they sent, and what they described in the repair text what I should use, but as soon as this is resolved, I'll try it and then publish the results here, and the description of the fix, if Siglent don't mind (they sent me a nice board screenshot from their CAD program with top/bottom side traces and annotations how to fix it). --- End quote --- nice, would be interessed in what they do. If you are allowed, maybe you can post it here. --- Quote from: FrankBuss on September 22, 2013, 08:51:40 pm --- --- Quote from: djeans on September 22, 2013, 08:18:17 pm ---EDIT: forgot to ask: is this thing hackable? I mean that you get an S model with a simple hack? I can not imagine that they have build something different. --- End quote --- Maybe, but why do you need a higher resolution than 10mV/10mA? There are no separate sense inputs, so depending on the length of the cables and the current, the voltage at your breadboard might be off by several millivolts anyway, because there are no external sense inputs, and I don't know an application where I would need to set the current limit with higher resolution. --- End quote --- 10mV is in fact sufficient, but because it's fun and it does not hurt to have the ability to change in 1mV ;-) I also assume that there is a kind of linux there.. then you can add for example ethernet interface etc. |
| Zbig:
--- Quote from: FrankBuss on September 22, 2013, 08:51:40 pm ---I don't know. But meanwhile the support sent me a description how to fix it, with soldering and replacing some new parts inside (all standard parts which you can get at Digikey or Farnell). There were some inconsistencies between the parts I can see on the image they sent, and what they described in the repair text what I should use, but as soon as this is resolved, I'll try it and then publish the results here, and the description of the fix, if Siglent don't mind (they sent me a nice board screenshot from their CAD program with top/bottom side traces and annotations how to fix it). --- End quote --- That's great news. Looking forward for your update on that matter. |
| Zbig:
--- Quote from: djeans on September 22, 2013, 08:18:17 pm ---[..] Regading the spikes: would a big capacitor help, something like 4700µ or so ? [..] --- End quote --- You'd ruin the CC mode response this way. --- Quote from: djeans on September 22, 2013, 08:18:17 pm ---[..] 10mV is in fact sufficient, but because it's fun and it does not hurt to have the ability to change in 1mV ;-) I also assume that there is a kind of linux there.. then you can add for example ethernet interface etc. --- End quote --- Why would you assume that? It doesn't seem that's the case to me. It's not like they're slapping Linux on each and every device equipped with large graphical LCD, you know... |
| FrankBuss:
I want to avoid unscrewing the front panel (I think I can solder all parts for the channel 3 fix without unscrewing, will get some missing parts tomorrow), but it looks like the only microcontroller in the system is the STM32F103, which would be too small for Linux. |
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