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New Siglent SPD4000X series power supply

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sparky2024:
Thank you for swift replies.

Peter, I see a peak of around 22v with a voltage setting of 32v.  This occurs identically with (img_3337) or without (img_3338) a high wattage 56 ohm resistor as load.  Ref. picture.

Defpom, I see the same response (as img_3338) without applying the “soft” on button i.e. power-up with prior settings, and just power down with the main switch.

There’s a definite capacitor discharge, but the relay in my opinion is charging that capacitor for 75-100ms.

sparky2024:
Furna, my unit is running 4.1.2.8R1.  As per another earlier message, my unit arrived with 4.1.2.6.  I’ve been living in hope of a firmware fix for this.

Wondering if @tautech, or a Siglent rep is following this thread and may be able to comment on this?

I may be in touch with my distributor in the UK soon if all else fails.

Thanks to all.

electr_peter:
Potential issue with output turning ON with high voltage and high current capability if mains switch is pressed should be looked into more closely (Is it a single unit/early FW/defective component or design specific?).
With complicated multi-channel PSUs outputing a "blip" with mains turn-off is not unheard off, but that's not critical when voltage/available current is limited to safe levels by design. If not limited, PSU can kill DUTs.

Furna:

--- Quote from: electr_peter on October 23, 2024, 06:49:55 pm ---Potential issue with output turning ON with high voltage and high current capability if mains switch is pressed should be looked into more closely (Is it a single unit/early FW/defective component or design specific?).

--- End quote ---

I guess TheDefpom and tautech will help when they receive their units ... I understand sparky2024 might chose to return his unit.


--- Quote from: electr_peter on October 23, 2024, 06:49:55 pm ---With complicated multi-channel PSUs outputing a "blip" with mains turn-off is not unheard off, but that's not critical when voltage/available current is limited to safe levels by design. If not limited, PSU can kill DUTs.

--- End quote ---

I agree; also as I wrote a very simple even if annoying solution is to disconnect cables as an attitude at everty mains power in/off.

mawyatt:

--- Quote from: electr_peter on October 23, 2024, 06:49:55 pm ---Potential issue with output turning ON with high voltage and high current capability if mains switch is pressed should be looked into more closely (Is it a single unit/early FW/defective component or design specific?).
With complicated multi-channel PSUs outputing a "blip" with mains turn-off is not unheard off, but that's not critical when voltage/available current is limited to safe levels by design. If not limited, PSU can kill DUTs.

--- End quote ---

Any overshoot at PS Turn ON/OFF with the Output Enable Buttons and also to the Main Power Switch ON/OFF is of concern to us. A few decades ago we lost a couple of very expensive custom chip sets to a rogue PS that had a glitch at Turn Off, ever sense we have been extremely sensitive to such :o

Best

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