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How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies?
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oz2cpu:
I am so happy you look into the odd regulation loop noise,
if this is a sw or hw issue, i dont know,

I have been "playing" with SPD3303 today, i did find optocoupler drivers on both sides, running 5 times
hotter, than all other opto driver transistors, so i figure they do run some kind of hi speed link there too,

since I keept remembering the too hot parts, in the EEVblog 828 see at 26 mins
and i run my SPD3303 most of the time in week long experiments
i was looking for a way to , fix the hot parts, and to dimm the display (mine are very bright)

I gave up on the display dimm, looks like impossible to do, i digged all the way to the display it self,
there is just no way to get access to the led wires and put in a resistor.

I did however fix the too hot parts, since i fixed both psu in one go, made the video during the 2nd psu fix,
so i knew what to do fast and easy.
it is all explained here:

https://youtu.be/nvGxl44cNno

incase anyone want access to all my hires pictures of all details inside SPD3303
get the 490MB zip here
webx.dk/siglent/SPD3303PICS.ZIP

Bad_Driver:
During the last firmware update I learned that there is a new hardware revision of the SPD3000.
(firmware update was only for new hardware release)
Has someone an idea what was improved?
BreakingOhmsLaw:

--- Quote from: Bad_Driver on November 15, 2022, 10:17:51 am ---During the last firmware update I learned that there is a new hardware revision of the SPD3000.
(firmware update was only for new hardware release)
Has someone an idea what was improved?

--- End quote ---

The SPD3303X(-E) had an issue with a bridge rectifier overheating, causing the unit to reset frequently under load. The issue is common. So far, Siglent has been repairing them under warranty as far as users here report. Funny enough, in Dave's teardown from years ago, he already noticed that hot rectifier.
https://www.eevblog.com/forum/repair/siglent-spd3303x-e-rebooting/msg4340536/#msg4340536


oz2cpu:
you might want to see this one
https://youtu.be/nvGxl44cNno

it is about how to modify the psu, so its life time will be much longer
Peter_O:
Never tried to calibrate mine.

acc. to siglenteu the 3.0 FW is the newest one: SPD3303X Firmware_V1.01.01.03.10 (Release Date 09.02.22 )

https://www.siglenteu.com/service-and-support/firmware-software/dc-power-supplies/#spd3303xx-e-series
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