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| Siglent SDG1032 as bad as rigol DG812? |
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| eTobey:
--- Quote from: tautech on May 22, 2024, 09:48:16 am --- --- Quote from: eTobey on May 22, 2024, 09:41:02 am ---But then they could just give some people some scopes to test for free? --- End quote --- Only properly competent people need apply. --- End quote --- Really? How do they determine the proper competence? |
| eTobey:
I have something that could really be interesting for siglent: I am thinking about the possibility, of relays switching off after device power off, so that the voltage of a higher voltage rail is put onto a lower voltage rail. Obviously it does not do damage immediately, but i could over time. |
| nctnico:
--- Quote from: eTobey on May 22, 2024, 09:41:02 am --- --- Quote from: nctnico on May 22, 2024, 08:52:14 am ---No they don't. While testing is very easy to automate using scripting. --- End quote --- But then they could just give some people some scopes to test for free? --- End quote --- Siglent is doing that but it doesn't work at all as the test coverage is too limited. I did some in-depth oscilloscope reviews in the past and going through the functions 'quickly' takes nearly a work-week worth of test time already. Doing a full functional test by going through a test plan with a decent coverage manually likely takes 3 to 4 weeks full-time for a modern DSO. And each firmware release needs a full re-test. Where it comes to complex pieces of equipment, you really need to do automated testing in order to verify existing and new functionality before releasing firmware with confidence that it works to a satisfactory level. Testing also reveals issues which can be listed under 'known issues' which can be fixed later or never. |
| eTobey:
--- Quote from: nctnico on May 22, 2024, 01:00:29 pm --- --- Quote from: eTobey on May 22, 2024, 09:41:02 am --- --- Quote from: nctnico on May 22, 2024, 08:52:14 am ---No they don't. While testing is very easy to automate using scripting. --- End quote --- But then they could just give some people some scopes to test for free? --- End quote --- Siglent is doing that but it doesn't work at all as the test coverage is too limited. I did some in-depth oscilloscope reviews in the past and going through the functions 'quickly' takes nearly a work-week worth of test time already. Doing a full functional test by going through a test plan with a decent coverage manually likely takes 3 to 4 weeks full-time for a modern DSO. And each firmware release needs a full re-test. Where it comes to complex pieces of equipment, you really need to do automated testing in order to verify existing and new functionality before releasing firmware with confidence that it works to a satisfactory level. Testing also reveals issues which can be listed under 'known issues' which can be fixed later or never. --- End quote --- Yeah, indeed i know how tedious it can be to test firm/software. But if someone who hasnt got a glue, and this scope for only a few weeks, can find dozends of bugs and issues, then, there is room for improvement. ::) |
| eTobey:
I have made some more investigation: I have put a piece of piezo on the BNC connector, to have a exact time (more or less) on the scope, when the relais are switching. On the picture "Turn off spike 2" you can see how it looks when turning it off. The green trace is the piezo, that captures the "shockwaves". The picture "2.3V to 3.3V 50Ohm" shows just a change of the outputvoltage (when relais do switch). I used the change of the voltages, to see exactly, how the green trace looks when relais switch. It has a characteristic of 2 bumps ("2-3V bumbs.png"). I believe, that these 2 bumbs are actually the contact hitting each other (the opposite not connected ones). This together with the capture of the turn off spikes ("first bump on turnff.png"), lets me conclude, that this is not a case of a relais "failing" to early, but a chip that would control the voltages of the output. Furthermore, i made another discovery, that one may find good to know: in track mode, the channels do not switch simultaneously. Funny thing is, that you otherwise even cant have different load outputs. ("channel 2 leads.png") Ps. Yes, it looks a bit weird to do all that investigation, but i just choosed to investigate its flaws, instead destroying something because of these flaws. ;D |
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