Products > Test Equipment
New Siglent SPD4000X series power supply
Furna:
--- Quote from: mawyatt on October 23, 2024, 08:06:43 pm ---
--- 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
--- End quote ---
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 :)
mawyatt:
--- 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
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
Martin72:
--- Quote ---You shouldn't have a PS that requires removal of the Banana Leads every time to "protect" your sensitive circuits
--- End quote ---
Sensitive circuits usually have overvoltage protection. If not, then you should take action yourself and implement it.
blackdog:
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.
But the world is full of bean counters, so....
Then it still comes down to the users, this to know your equipment well and handle it with care.
If you have a Spectrum or an expensive VNA, when you make an initial measurement, there is always an attenuator on your input!
And if your noise floor is not that important, then leave that attenuator in place.
When developing electronics, I still regularly unplug banana sockets.
If I am testing something in the early stages of development, there is not always protection in place.
The world is not perfect, I certainly am not! :-DD
With kind regards,
Bram
mawyatt:
--- Quote from: Martin72 on October 31, 2024, 05:09:17 pm ---
--- Quote ---You shouldn't have a PS that requires removal of the Banana Leads every time to "protect" your sensitive circuits
--- End quote ---
Sensitive circuits usually have overvoltage protection. If not, then you should take action yourself and implement it.
--- End quote ---
Unless you can't as in a product development where you are relying on the chip ESD protection in early stages of said development (example using a Lab Supply to bypass the system or on PCB Power Supply and/or Regulators). A chip ESD will protect from the usual body discharge energy but maybe not be robust enough to handle a PS glitch which evidently some of the mentioned PSs can produce!
And what about the Mains Power interruption, how is one going to predict this in advance and remove the Banana Leads?? What if the PS is part of an automated test setup, here removing the leads seems impractical, altho one may have a UPS with this setup to protect against Mains Power Interruption, however this adds additional expense and complexity in the setup.
Coming from the analog side, and retiring from a career in electronics development, including IC Design, we can tell you that we would never ever allow any type Lab Supply that produces Significant Output Voltage Glitches upon Power Up or Down, whether by Mains Power Switch and/or Output Enable Button.
We can assure you that if this is the character of the new Siglent SPD4000X series, they will never end up on our lab bench as a Lab Supply until it's proven to be acceptable which the SPD3303X and GPP-4323 have met and performed well. Even our high current 30A/15A (read not for use with sensitive circuits) Korad KWH102 and 103 which are SMPS types don't misbehave in this regard!!
Anyway, as always YMMV.
Best
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