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| How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies? |
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| oz2cpu:
just open, no load, and about 2V since in this range my voltmeter got very high resolution, and can reveal the problem, play with the time roll setting, and see how it looks you got SDM 3055 ? or even better ? I tried this many times, back and forward, just to prove it is not SDM 3055, I constantly get the same result. if any one will find the bug inside the psu, i will be happy to open and perform mod, also we should inform siglent, so they can improve the design. By the way : i got a few ideas for software improvements SPD3303X in parallel mode : turn other screen off, and show the correct ADDED current, and the total power correctly.. today it display halve of the current and power in ch1 and the other halve in ch2 same problem in series mode !! suggestion : turn ch2 display off. and display the new total voltage, new total power.. I happen to use series and parallel mode a lot, so this not smart. |
| Bad_Driver:
ok I own the SDM3065 but I‘m just starting a business trip, so I can try it not before end of the week. I found another benefit of the SPD, it is not as deep as the Rigol PSU and since I have very limited space this was one of the main decision criteria. B.D. Edit: I was curious about your findings and did a quick test. First finding: Standard deviation (noise) increases with load (ohmic resistor) Second Finding: My 40 year old east german anlog PSU has at 2 volts about 10 times lower noise than the SPD3303 !! Photos will follow when I return. I have a Low Noise Amplifier on the bench for this kind of measurements, around Xmas I can do a deeper dive into Siglents noise floor with FFT :box: |
| Bad_Driver:
As promised here my measurements of the SPD3303X. See photos and read STD value. #1 warming up #2 no load #3 4 ohms resistor (0.5 A) #4 2 ohms resistor (1 A) #5 my 40 years old east german analog PSU But I‘m not sure that this is the whole story, I tried to see the noise on the scope but my bench setup seems to suffer from grounding problems, I catch a lot other noise. It needs further investigations. |
| oz2cpu:
thanks alot, I think what you see, is the same i see the SPD3303 got : quite warm up time before stable (you did warm up your multimeter a few hrs before starting the SPD warm up test ? we need to be fair here. two different types of ac noise one sine wave shaped very slow (also visible on your curves) and one sharpedged pulsed, much faster (also visible on your curves) is it possible to lock ? the vertical scale on your SDM 3065 ? so it is same as mine ? and same time scale too ? I am getting ready reperform my tests, but first i run a 2hr SDM 3055 warm up, so we know it is the SPD we see.. if you want to prove the SDM is performing stable, take a 1.5V AA cell, set the centre, and min max points, same as what we do for psu tests. I also got a real old analog psu. mine is only 35years old, i will also see its power up, and warm up time, just for fun, its refferance might just be a normal zener diode |
| oz2cpu:
more : i came up with those settings, for more fair and more controlled compares: power on warm up, 5mV full scale, 1800 sec full scale this is my right unit SPD3303X ch1 |
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