Maynuo eload speed tests

[Harvs]

Posting this here incase anyone is interested.

Someone on another forum asked me about the max update speed for the Maynuo electronic load, so I wrote a couple more test scripts for the library:
https://github.com/harvie256/MaynuoPy

Anywho, results were a max update rate of 125 updates/sec.

Chanel 1 below is the current output on the back of the Maynuo, and channel 2 is the 115200 serial line.

Speed test is changing from 1A to 2A square wave.

[HighVoltage]

That is a nice test you did.

I just tested a buck converter with the Maynuo, 12V input, 18V output at up to 15A
During the test, I went up to 50 updates/sec. and was surprised, how stable the Maynuo was.
Absolutely amazing!

In contrast, I also have a BK-Precision eload and that one was only stable up to 10A.
And the BK-Precision instrument was twice as much $$

[Harvs]

In contrast, I also have a BK-Precision eload and that one was only stable up to 10A.

Really, as in the 8500?  Surprises me that there's much difference, I thought they were pretty much the same hardware?

I'm interested in what conditions it was unstable under.  Generally speak for a CC load to become unstable it needs a source with a lot of series inductance such as long connecting cables.

[saturation]

Eloads working with high amps will tend to oscillate.   Keeping leads shortest and placing a rated capacitor on the input will change the RLC relationship and usually fixes the problem.

[Harvs]

placing a rated capacitor on the input

I take it one step further and have some cap and resistors setup to do this.  Just low value resistors, like 100mOhm, in series with a few uF cap works wonders as a snubber.