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Power supply for home lab - do I really need a R&S?
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pdenisowski:

--- Quote from: salomonander on October 13, 2024, 11:01:20 am ---This is a bit disappointing. Im still set on buying an NGA102 as the problem wont bother me much in my applications. But after i saw Daves video where he showed this issue and studying the firmware notes i was convinced that they have tackled the issue. They are well aware of it. See the firmware notes:

https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/pdm/firmware/5601_9009_00/NGA100_ReleaseNotes~1.pdf

Does anyone here have a NGA100 with up to date firmware who can comment?

--- End quote ---

Here's the output of the NGA142 connected to a 50 ohm load



 
KungFuJosh:

--- Quote from: pdenisowski on October 14, 2024, 08:21:24 am ---Here's the output of the NGA142 connected to a 50 ohm load

--- End quote ---

Can you do some more tests that put that in the context of the other tests that have been done? For example: https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5667833/#msg5667833

I would like to see current response also, not just voltage.

Thanks,
Josh
mhsprang:

--- Quote from: KungFuJosh on October 14, 2024, 04:19:07 pm ---
--- Quote from: pdenisowski on October 14, 2024, 08:21:24 am ---Here's the output of the NGA142 connected to a 50 ohm load

--- End quote ---

Can you do some more tests that put that in the context of the other tests that have been done? For example: https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5667833/#msg5667833

I would like to see current response also, not just voltage.

Thanks,
Josh

--- End quote ---
That is the current response. The oscilloscope shows that the voltage doesn't rise above 40 mA * 50 Ohm. And since this is a resistor, the current flow is idential in "shape" as the voltage across the resistor.
KungFuJosh:

--- Quote from: mhsprang on October 14, 2024, 04:22:06 pm ---That is the current response. The oscilloscope shows that the voltage doesn't rise above 40 mA * 50 Ohm. And since this is a resistor, the current flow is idential in "shape" as the voltage across the resistor.

--- End quote ---

Good point. I guess I was thrown off by how pretty it looks. I guess the OP really does need an R&S. 😉

But also, I'm curious about lower current settings too. For example, setting a 10mA or 20mA current level. Some PSUs behave differently depending on the current setting.

For example, my SPD3303X only overshoots when set below 30mA, as 29mA is the typical overshoot on power activation.
mhsprang:
@KungFuJosh,

I agree about the lower current setting. I sort of started this by observing a huge overshoot on my R&S NGE103, which is now being investigated by R&S. That overshoot is happening at all currents below 140 mA and is always up to 140 mA.

So, maybe this NGA 142 is doing allright at 40 mA but behaving bad at 10 mA. Maybe @pdenisowski could repeat this test at 10 mA as well.
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