Products > Test Equipment

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

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rf-messkopf:

--- Quote from: mawyatt on October 03, 2024, 12:28:36 am ---That's totally unacceptable behavior from any supply, it's a disaster in the waiting for just about any sensitive electronics use we can think of.

--- End quote ---

I don't disagree with that statement but this behavior is quite common for a number of supplies from reputable manufacturers.

I just tested the supplies I currently have on the bench. All set to 8 V, 10 mA, loaded with 50 ohms. The attached pictures show the output voltage when the load is connected to the supply.

HMP4040-E3646A.png: green trace: R&S HMP4040, white trace: Agilent E3646A.
6632B.png: Agilent 6632B, with rear panel "Fast/Normal Operation" switch set to "normal" (notice the time scaling).

The Agilent 6632B hangs at 8 V for about 150 ms.

ArdWar:
Keithley 2281 :o


Keithley 2281 with 100V/s slew limit


R&S NGP800  :o :o (Note the different vertical scale)


Keithley 2461 (I mean, I'll burn their HQ if it didn't work properly)


mahi:
Rohde & Schwarz HMP4040 (pre-facelift).

Tested at 8V and 20V with 10 mA current limit in a 50 ohm load. Even at 32V the output looks the same as the 20V test.

2N3055:

--- Quote from: rf-messkopf on October 03, 2024, 05:18:53 pm ---
I don't disagree with that statement but this behavior is quite common for a number of supplies from reputable manufacturers.


--- End quote ---

Maybe it is time we start reconsidering difference between good reputation and legends and lore..
And assign brand value according to actual results and not "reputable brand" urban legends...

rf-messkopf:

--- Quote from: 2N3055 on October 03, 2024, 05:43:55 pm ---
--- Quote from: rf-messkopf on October 03, 2024, 05:18:53 pm ---
I don't disagree with that statement but this behavior is quite common for a number of supplies from reputable manufacturers.


--- End quote ---

Maybe it is time we start reconsidering difference between good reputation and legends and lore..
And assign brand value according to actual results and not "reputable brand" urban legends...

--- End quote ---

True. Attached: same test with a 20 year old homemade supply, completely analog.  :)

Note: My tests show the load being connected to the supply, with the output already on.

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