Products > Test Equipment

New Siglent SPD4000X series power supply

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mawyatt:

--- Quote from: blackdog on November 01, 2024, 11:57:34 am ---My mantra is that a power supply should always protect its load.
And as Martin72 points out, that sensitive circuits should also already have protection themselves.

--- End quote ---
Agree a Lab PS should not damage or destroy a load by misbehaving!!

Also agree, completed circuits/systems/products should have basic built-in protection. However this usually doesn't apply during early circuit/system/product developments, where one is chasing circuit/system glitches, oscillations, overheating, overcurrent, miswiring, and so on issues. Here, one needs to concentrate on the problems at hand and not Lab Power Supply induced issues :o

Best,

mawyatt:
BTW another potential issue wrt the plugging in and out of the Banana leads involves the Lab Supply Output Capacitance. Many supplies have significant capacitance across the supply output terminals and if these are charged to the set point voltage as when the Output Enable is On, this can introduce a significant current "glitch" into the circuit, well beyond the Current Limit Set Point, when the Banana leads are engaged.

Of course one shouldn't plug the leads into a "Live Output", and must remember to make sure the Enable is OFF and no extraneous voltage is present before plugging in the leads, but just another potential source of user error where the result could be disastrous  :o

We make these comments based upon a 60+ year of electronics development and have many "teeth marks" to show, and have learned what works and what doesn't.

Learning by error is the most lasting impression, learning from others errors in lasting wisdom :-+

Best,

jjoonathan:
Yep, that's why IMO the first electronics lab class should always start by letting kids explode LEDs on lab power supplies. 8)

 :-BROKE "But I set the current limit to 2mA!"

"Well, you see..." fun times all around.

Furna:

--- Quote from: mawyatt on October 24, 2024, 12:38:51 am ---
--- Quote from: Furna on October 23, 2024, 08:14:47 pm ---
With SPD4000X series power supply you cannot Turn ON with the Output(s) Enabled; channels are Off even if they were On at previous PS Turn Off.
So you may now think the caputure I took, demonstrates even a worst situation than you tough.
Disconnect the cables and leave happy :)

--- End quote ---

So what happens when you have the PS Main Power Switch ON and the Outputs OFF, sensitive circuits connected and a Main AC Power becomes disconnected/interruped  :o

--- End quote ---




--- Quote from: mawyatt on October 24, 2024, 12:38:51 am ---You shouldn't have a PS that requires removal of the Banana Leads every time to "protect" your sensitive circuits, and then reinstall when you want to power up things again. For us this is totally unacceptable PS behavior and just a recipe for disaster at some point :palm:

Best

--- End quote ---

As you said an UPS could and should be used; also someone else wrote about protection circuits.
That said this is what I have now and I chose to live with it; if the issue will be addressed I will think about my action.

Best

mawyatt:
Let's all hope Siglent addresses some of these early teething issues, especially the ones that can cause damage rather than just an inconvenience, then we'll consider evaluating one if the need arrises :-+

It's interesting how our equipment needs seem to follow new introductions, like the superb SDH814X HD. We've explained this to our CEO/CFO/Boss as just a unique coincidence ;)

Best

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