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New Siglent SPD4000X series power supply

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Furna:

--- Quote from: KungFuJosh on October 23, 2024, 04:10:42 pm ---Why not use single trigger on your scopes to test this?

--- End quote ---

Because I had no time this morning and I am just back from work :)

sparky2024:
Scope trace of SPD4323X channel 2 with no load (hence voltage drop is prolonged).

Steps to reproduce:

1) Set channel 2 to a voltage (5v selected in this case), and switch on channel.  Switch off.
2) Set scope to Normal or Single trigger, timebase 1sec.
3) Switch off main SPD4323X power switch.

Note I have no load attached, but have seen LEDs flash on my projects.  The amplitude follows the setting.  Also this is only evident on ch 2 & 3.  Channels 1 & 4 behave as I would expect.  Serial or Parallel modes are disabled.

Measuring the level (zooming in a bit in this case), we see the level persists for 75ms, and starting from the rising edge is around 100ms total.  Sounds like software to me.

Furna:

--- Quote from: sparky2024 on October 23, 2024, 05:47:49 pm ---Scope trace of SPD4323X channel 2 with no load (hence voltage drop is prolonged).

Steps to reproduce:

1) Set channel 2 to a voltage (5v selected in this case), and switch on channel.  Switch off.
2) Set scope to Normal or Single trigger, timebase 1sec.
3) Switch off main SPD4323X power switch.

Note I have no load attached, but have seen LEDs flash on my projects.  The amplitude follows the setting.  Also this is only evident on ch 2 & 3.  Channels 1 & 4 behave as I would expect.  Serial or Parallel modes are disabled.

Measuring the level (zooming in a bit in this case), we see the level persists for 75ms, and starting from the rising edge is around 100ms total.  Sounds like software to me.

--- End quote ---

Just tried also with your settings and cannot reproduce; I have absolutinh nothinh even with trigger set to 30mV.
What FW do you run?

Indeed I have the following at master power on ... something I do not have at channel power on.
I usually disconnect cables to avoid any issue at every master power off/power on.

electr_peter:
@sparky2024, what is the max voltage with mains switching off (if set not to 5V but to max V)? Can you also check maximum possible current with a load (resistor on output)?

TheDefpom:
T hat looks like capacitor discharge to me, what about leaving the channels off, setting a high voltage, power of the main switch, and then power main switch on?

I suspect there would be no pulse in this instance.

I’m just waiting for my unit to arrive so I can’t test this myself yet.

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