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

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Lochstreifen:
Some years old, but nice overview of multi channel PSUs

https://goughlui.com/2019/07/28/rs-hmc8043-psu-review-in-depth-ch1-market-survey/

FranciscogGomez:

--- Quote from: pdenisowski on May 06, 2024, 03:49:24 pm ---
--- Quote from: FranciscogGomez on May 06, 2024, 04:23:45 am ---I want to debunk the need of a power supply from Rohde & Schwarz and for this

--- End quote ---

Serious question:  could I ask why you want to debunk the need for an R&S power supply?  We make very nice power supplies, including the NGE :)

--- End quote ---

hey pdenisowski,
For sure R&S make nice power supplies and I do like the build quality of them(hats off). That's why I'm considering to get one. However, the reason I want to debunk the need of a power supply from R&S is from the point of view of single person/engineer with a lab. at home and limited budget compare to a company.
For the price of a NGE103b, I can get a mid-quality but decent power supply (that will do its job) for less money; which will leave my wallet with  extra cash to get more equipment.
What I'm looking for  is to learn from experiences from colleagues that had experienced this dilemma before

Regards
 

FranciscogGomez:

--- Quote from: Lochstreifen on May 11, 2024, 05:56:44 pm ---Some years old, but nice overview of multi channel PSUs

https://goughlui.com/2019/07/28/rs-hmc8043-psu-review-in-depth-ch1-market-survey/

--- End quote ---

Thanks Lochstreifen,
I really do liked this post.  well... Part1, I still need to read up to Part6.

tautech:

--- Quote from: FranciscogGomez on May 11, 2024, 05:43:13 pm ---Based on your previous comments and suggestions, I have update my list:

--- End quote ---
If you're not in a hurry one of the SPD4000X PSU's coming in a month or 2 might be of interest.
https://www.siglent.com/products-overview/spd4000x/

You've not listed any hard V/A requirements ?

mhsprang:

--- Quote from: pdenisowski on May 07, 2024, 04:11:33 pm ---
--- Quote from: thm_w on May 06, 2024, 10:04:18 pm ---You can read some older threads

--- End quote ---

Old indeed :)  Most of the information in those threads is from 2017 or 2020 and refers to the older version, which has been discontinued.  The current HW is the NGE100B

Old:  https://www.rohde-schwarz.com/us/products/test-and-measurement/dc-power-supplies/rs-nge100-power-supply-series_63493-387267.html
New: https://www.rohde-schwarz.com/us/products/test-and-measurement/dc-power-supplies/rs-nge100b-power-supply-series_63493-576967.html

--- End quote ---
But the NGE100B series also has its flaws. One of them is the CC mode.

In constant current mode, the control loop is way too slow. For instance: if you set the voltage to 20V and the current to 10 mA to test a LED and enable the output with a led connected, the voltage will overshoot to 20V for almost 20 milliseconds, before settling on the Vforward of the LED. This will kill the led as the current will be far beyond the maximum limits of the LED.

A test with a 50 Ohm load and a current set to 50 mA let the voltage spike to 18V for 20 ms (I = 360 mA!), after that is decays exponentially over a period of 60 ms to 2.5V (50 mA * 50 Ohm). This is such a serious design flaw that I feel this design should have never made it to market.

This problem has never been fixed in all the firmware updates that have been released over the last couple of years.

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