Products > Test Equipment
PSU Constant Current response timing comparison
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Frex:
Hello,
My little contribution to this thread. :)

By curiosity, I have done the same tests with my both main supplies :
The triple outputs lab power supplies ITECH IT6302 (195W 7.1kG) ,
and my home made "DIY" EPSUX3V2 (180W 1.4kG) .

I used the same scope setting as possible for easy comparison (as first post).
The load is 8 Ohms (instead of 10), and the output voltage of the EPSUX3V2
 is 20V instead of 24V.

Both are fast, even if the DIY one is the winner! :-D
The IT6302 use relays for voltage range, with the 10Hz load switch
 is very noisy and I don't think it would love it for a long time..(my hears too).

I added today (06/08) some picts I had made of the setup of both power supplies,
 an the small load switch board.


Frex



jchw4:
My setup (random parts I had around):

- 10 Ohm 5% ceramic load resistor SBCHE1510RJ
- 0.3 Ohm 5% ceramic sense resistor TWW5JR30
- IRF510 MOSFET

Tools:
- Feeltech FY6600 signal generator
- Digilent Analog Discovery

jchw4:
BK Precision 9130 https://www.bkprecision.com/products/electrical-battery-testers/9130

This one has all brand new capacitors.

"begin" - measurements at the start of a pulse (0.5 Hz)
"end" - at the end.

Every capture is an average of 5 acquisitions.

Note that at the start of a pulse I captured current across the sense resistor, but at the end I captured BK9130 output voltage.

These graphs are from the first channel. I checked the second one and it basically has exactly the same behavior.
jchw4:
ITECH IT6322B https://www.itechate.com/en/info_128.aspx?itemid=548&lcid=90

The same notes above apply:

Every capture is an average of 5 acquisitions.

Note that at the start of a pulse I captured current across the sense resistor, but at the end I captured BK9130 output voltage.

These graphs are from the first channel. I checked the second one and it basically has exactly the same behavior.
jchw4:
Agilent 66321D https://www.keysight.com/us/en/product/66321D/mobile-comm-dc-source-battery-emulation-dvm.html

This is a relatively new unit, Agilent-branded.

Surprisingly it has the slowest overcurrent reaction speed in this topic: about 80ms! Exactly as its older brother 66311B (see below).

66321D is capable of 0..15V of output so I measured 15V and 10V (for voltage stability).

This model supports 4 modes of output compensation: HREMOTE, LREMOTE, HLOCAL or LLOCAL.

By default I used HLOCAL. LLOCAL did not make any difference. Remote modes only affected the off-transition (see the photos).

I also had two cables: ~1.5-1.8m AWG16 with local sense only, and a shorter ~1m twisted AWG 14 with twisted sense leads. It made some difference.  :)

Every capture is an average of 5 acquisitions.

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