@Hydron: So, on your question regarding transient rise times.
So I did some more testing, and either I do not understand how it is supposed to be measured, or this ET5410 is not what you want when you value dynamic testing.
I mean, it works well for what I bought if for, and the price is right. So I should probably not let this get to me. But the dynamic testing seems to be lacking.
Dynamic CC Continuous:
- Basically works (if we ignore specs)
- Settable resolution is fixed 5-digit ms, so 1ms to 60.000ms. Not in μs like the spec say. And certainly not 50μs to 3600s
- Best rise time I got is about 1A/ms in part of the slope, and 0.3A/ms in the overall 5Amp rise (see screens 1, 2, 3)
- Then again, I find the advertised 1.5/μs very fast. Are those kind of figures normal?
Dynamic CC Pulse:
- Basically does not work. When I turn on or off, the current turns on or off. I am unable to get a pulse out of this
- Rise time is slightly better though when turning on, about 5A/ms, but with overshoot (see screens 4)
Dynamic CC Trigger:
- I think it works. The manual trigger swaps between level A and level B, and thus the durations have no meaning
- Trigger can be "Auto, Manual, External" which hints that the cut-off ribbon cable near the back has a trigger in it.
- Rise time is same as Continuous.
Thinking about this, one thought I had is that the rise time is slow, because it is limited.
Maybe there is a settable 1A/ms default somewhere. But if so, I cannot find it.
Another thought is, this is rebrand with (bad) custom firmware. The fixed 5-digit milli-second duration setting, instead of 50μs to 3600s hints at this.
So maybe this is a re-branded OEM and East Tester only makes front panel and new firmware, and they messed up on the firmware but publish the original device's specs.
After all, between the Kunkin, East tester, DingChen, too many nearly similar form factor devices hit the market at the same time.
Images
Sorry for the photos, could not find a FAT formatted USB stick.
Yellow = measured with current clamp probe; Blue = measured with 0.1Ohm shunt
Next up I will redo my IGBT testing, see if my memories on the 20KHz were correct.
But the wheater is good outside, so not now....