Products > Test Equipment
PSU Constant Current response timing comparison
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jchw4:
HP-branded 66311B https://www.keysight.com/us/en/product/66311B/mobile-communications-dc-source-15v-3a.html

It's probably one of the last HP-branded units. Probably made around 1999 - 2000.

The same 80ms over-current delay!  :-//

I did not check the two available compensation modes. Used only the default one, which was probably "Low".

Used only the twisted cable with remote sense as described above.

Every capture is an average of 5 acquisitions.

Please note that some captures measured current and some measured the power supply output voltage.
jchw4:
RD DPS3005 https://rdtech.en.alibaba.com/productgrouplist-805451526/DPS3005.html

I powered it with the laptop power adapter and thus only 19V maximum voltage.

Here you can see measured both current and voltage. AD has only 2 channels, so these are different acquisitions. But behavior is pretty stable and this is still an average of 5.
alm:

--- Quote from: jchw4 on June 11, 2023, 01:57:39 pm ---Surprisingly it has the slowest overcurrent reaction speed in this topic: about 80ms! Exactly as its older brother 66311B (see below).

--- End quote ---
I think the high speed part of these power supplies is about load regulation within the current limit. They were made to simulate a battery and charger. Fast current limiting when shorted would not be a very accurate simulation of a secondary lithium cell ;)
nctnico:

--- Quote from: jchw4 on June 11, 2023, 02:09:58 pm ---HP-branded 66311B https://www.keysight.com/us/en/product/66311B/mobile-communications-dc-source-15v-3a.html

It's probably one of the last HP-branded units. Probably made around 1999 - 2000.

The same 80ms over-current delay!  :-//

--- End quote ---
I have that model as well. I don't know what they where thinking when they designed this unit! The current limit is pretty useless if you want to use this PSU as a constant current source. When you turn the output on, it cranks it up to the set voltage and after a while it starts to limit the current  :palm: FFS!
Peter_O:
A new PSU to be added ...


--- Quote from: Peter_O on July 30, 2022, 09:03:13 am ---
Snip:

Having collected some PSUs with CC capability I’d like to know how quick they are responding to an overcurrent condition.

Test setting is like this:

PSU is configured to deliver 25V/1A.
PSU is connected to a 10 Ohms resistor.
This load circuit is switched on/off by a MOSFET-Module, controlled by a function generator.

off: No load, PSU idles at 25V/0A
on: PSU would deliver I=U/R=2,5A but limits current to 1A by lowering the voltage to 10V. The question was: How quick does this happen?


--- End quote ---

Here's my new acquisition, a HP E3632A:


More pictures in the TEA thread:
https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg5219643/#msg5219643

And the results, showing the PSU voltage (CH2, magenta) at leading and trailing edge of the Mosfet control signal (Ch1, yellow).

 

The E3632 is one of the faster ones with 10ms up and down.
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