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How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies?

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oz2cpu:
exactly fft will tell us, and then it can be fixed (by modding or by siglent update the design?)
however if sample time is too low ? the resulting fft could fool us
this is why i played so much with recording time / sample interval

(all this amimated me to look into making a super nice stable and noise free reference for my test equipment experiments)

Bad_Driver:
I started a 2h (3 measurements/sec) recording, than we have about 20.000 samples.
Has someone a suitable software for FFT by the hand?
I will provide the file as attachment asap.

Edit:
2h record, 3 Measurements/sec attached - feel free to do the FFT
(file renamed to txt, CSV-format)

Bad_Driver:
ok, I've done a short self learning session regarding FFT with Excel.

Attached my first step. It needs deeper investigation and I'm considering a new series with 1 PLC / 50 readings per second.
As we learned it needs external triggering to get fast readings. I do not have time these days, maybe someone else can try it.

x=frequency, y=amplitude
As expected some peaks.
Any comments?

oz2cpu:
in the quest to understand what is a good powersupply, i found a few more of my old things...

this one Oltronix stabpac mca 5-3 is from 1973 at least that is what I see written on the schematic
it is very hard to date this exact unit, from its serial number ? when was they sold ? start ? stop year ?
video detail : https://youtu.be/pspuqOsWG44
now see this power on curve from cold.. +/- 1mV scale..
also : its noise and regulation is in the crasy low, wtf :-)
cant even see 0.1mV drop when load change from 0-3A
it is possible... just saying

Bad_Driver:
Hi oz2cpu

I saw your video regarding this old PSU, very impressive!

Since Santa Claus put a new toy (SSA3021X+) under the tree I didn't‘ spend more time with the SPD these days.

Yesterday I got an very old idea in mind for the simplest check at least (don‘t lough plz!) I connected the PSU outputs DC-BLOCKED
with the LF-input of my batterie powered speaker system (avoiding grounding problems) to listen to any noise - nothing!

I have to put more efforts in it, I was impressed in your video how good automatic triggering of your SDM3055 runs (the green flashing dot on the top left), with the 3065 it is a night mare…. as mentioned in the SDM thread I tried as suggested external triggering but did not get what I expected.

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