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Lab Power Supply Turn ON and OFF Characteristics
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AVGresponding:

--- Quote from: AVGresponding on October 08, 2024, 07:19:30 pm ---HP 66311B on and off:





Siglent 3303X (hacked from RS Pro 3303X-E) on and off:



--- End quote ---



Revisited this, as I realised I'd used a 4R7 resistor instead of a 47R...   :palm:

3303X:




66311B:




Apologies for any confusion my blind-assed dumbshittery may have caused   :scared:
Furna:

--- Quote from: mawyatt on October 09, 2024, 01:43:11 am ---@ Furna
Thanks for the post, could you repost the above over here:
https://www.eevblog.com/forum/testgear/power-supply-series-mode-for-split-dual-tracking-use/
We have response prepared but realized it's better in the above thread for folks to follow, and didn't want to copy your post without permission, and didn't want to clutter this thread up since it's dealing with ON/OFF characteristics.

--- End quote ---

Answered there
mawyatt:

--- Quote from: AVGresponding on October 09, 2024, 07:09:27 pm ---
--- Quote from: AVGresponding on October 08, 2024, 07:19:30 pm ---HP 66311B on and off:





Siglent 3303X (hacked from RS Pro 3303X-E) on and off:



--- End quote ---



Revisited this, as I realised I'd used a 4R7 resistor instead of a 47R...   :palm:

3303X:




66311B:




Apologies for any confusion my blind-assed dumbshittery may have caused   :scared:

--- End quote ---

No worries, we've all been there done that especially with color coded components, heck we've even done this with numeric coded components :o

Your 3303X looks like ours wrt the ON waveform. Seems the short duration "glitch" at initial ON condition is independent of the PS settings, either Current limit or Voltage setting.

Anyway, thanks for update :-+

Best,
KungFuJosh:

--- Quote from: mawyatt on October 09, 2024, 08:20:35 pm ---Your 3303X looks like ours wrt the ON waveform. Seems the short duration "glitch" at initial ON condition is independent of the PS settings, either Current limit or Voltage setting.

--- End quote ---

I had a thought about this that's slightly weird I guess. But the current setting is a setting, not really a limit. So I tried adjusting OCP (hold down the right arrow under the knob on the 3303X), and that had absolutely no effect on the ~29mA turn on spike when using 10mA as the setting & OCP limit. I haven't tried higher levels yet.
AVGresponding:

--- Quote from: mawyatt on October 09, 2024, 08:20:35 pm ---No worries, we've all been there done that especially with color coded components, heck we've even done this with numeric coded components :o

Your 3303X looks like ours wrt the ON waveform. Seems the short duration "glitch" at initial ON condition is independent of the PS settings, either Current limit or Voltage setting.

Anyway, thanks for update :-+

Best,

--- End quote ---

Oh, it's worse than that; these were 10W epoxy coated wirewound, marked 4R7...  :-DD

bd139 suggested it might be the inductance (not knowing of my mistake), so I paralleled six 270Ω carbon composition resistors together, and got the results you see in my updated post. It was some minutes of head scratching until I realised what I'd done.



EDIT: Some recent experiments with some NOS 1N827's has shown me that using these psu's as a precision current source just doesn't work; the output is too unstable. The only way to get a stable output current is in CV mode by using a limiting resistor and getting the current you want by means of setting the voltage appropriately and avoiding going anywhere near CC mode.
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