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

--- Quote from: mawyatt on January 07, 2022, 11:54:41 pm ---Good news on the rogue SDP3303X-E that had the current offset mentioned much earlier. We sent this to Siglent NA before the Holidays and just received the repaired unit.

--- End quote ---
Really nice! Any idea what they did to fix it? Clear an eeprom and recalibrate perhaps?
Bad_Driver:
Had a short look into Dave's video. The ADC is a AD7792 (3-channel, 16/24 bit) and the reference is a ADR03.
If they have done the regulation feedback loop in "software" than they should be able to fix it with a firmware update.
mawyatt:

--- Quote from: blurpy on January 08, 2022, 09:53:25 am ---
--- Quote from: mawyatt on January 07, 2022, 11:54:41 pm ---Good news on the rogue SDP3303X-E that had the current offset mentioned much earlier. We sent this to Siglent NA before the Holidays and just received the repaired unit.

--- End quote ---
Really nice! Any idea what they did to fix it? Clear an eeprom and recalibrate perhaps?

--- End quote ---

Agree, really nice they did this under warranty since I had "augmented" the X-E to an E. Our only cost ($50) was shipping to Siglent NA :-+

No idea what they did.

Best,
mawyatt:

--- Quote from: Bad_Driver on January 08, 2022, 03:08:42 pm ---Had a short look into Dave's video. The ADC is a AD7792 (3-channel, 16/24 bit) and the reference is a ADR03.
If they have done the regulation feedback loop in "software" than they should be able to fix it with a firmware update.

--- End quote ---

Siglent may have implemented a "Dual Loop" with a continuous feedback loop and another feedback loop formed with the ADC where this becomes more of an output voltage update and now behaves as a sampled data feedback in parallel with the continuous loop.

Agree the loop formed with the ADC should be affected by firmware.

Best,
Bad_Driver:
I found some time to setup my high-end audio interface (Terratec DMX6 Fire USB) to measure the noise spectrum above 10 Hz of the SPD3303X.
(it's a night mare since all the drivers are from the good old XP/win7...8 decade)

Attached the results. Graph 1 is channel 1 @ 2 volts, no load. Graph 2 is channel 2 @ 2 volts, no load.
Nearly identical. Above 3 kHz is nothing of interest in the spectrum ( I did it up to 90 kHz with "AudioTester 3.0; 192 kHz sampling rate, 24 bits).

Please note that the levels of the spectrum are in calibrated "dBV". Overall the SPD is in specs. There is no dependency to the level of output voltage.
End of the week I can try it under load.
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