Products > Test Equipment
ET5410 Electronic Load mod: add external sense
Hydron:
Agreed, after I heard about that issue with the Kunkin I was never going to buy one regardless of price difference.
Edit: ...and the above is wrong, read it elsewhere too but must have been user error or something! I've just checked a video and the guy is adjusting it live.
aristarchus:
That is the problem with those that do reviews and do not even know how to operate the device under review.. thus their videos give wrong impressions to viewers.
Got a KP184 and honestly I believe there is nothing to beat its VFM and the more I see other similar loads the more I appreciate it.
cybermaus:
@aristarchus
Sorry, I am not quite sure how to interpret your remark.
Anyway, I did do the IGBT test again.
So Load is set as a 4 Ohm resistor, and a MOSFET is drawing current through it, driven by a 20KHz PWM signal.
And indeed, it is doing pretty well emulating this resistor. Maybe it is because it does not need to react, just stable keep its internals set to the emulated 4 ohm, regardless of the PWM state.
But initially when I tested this, I wondered this sort of setup would work, and it does. Even at 20KHz it shows a fairly square amp use.
Note how the amp does jump from 0Ampt to almost 3 Amp (12V over 4 Ohm) but the load display calculates the average current
Yellow is current drawn. (almost 3 Amp peak))
Blue is voltage over MOSFET, connected to Load Negative (12V then open).
Hydron:
--- Quote from: aristarchus on September 26, 2020, 08:27:22 pm ---That is the problem with those that do reviews and do not even know how to operate the device under review.. thus their videos give wrong impressions to viewers.
Got a KP184 and honestly I believe there is nothing to beat its VFM and the more I see other similar loads the more I appreciate it.
--- End quote ---
I assume you mean value for money by VFM?
And yes, it does appear that you can adjust it live, I read somewhere else on the forums (can't remember where) that there were issues adjusting it live but I found a video disproving that - apologies.
If the Kunkin was the only <$250 load then I would get one for sure, however it looks like there are others that are more user friendly and I'm happy to pay a bit more for a nicer UI and a power switch on the front rather than on the back next to LIVE screw heads (i.e. safety modifications required before use).
cybermaus:
--- Quote from: Hydron on September 26, 2020, 10:17:09 pm ---.. next to LIVE screw heads (i.e. safety modifications required before use).
--- End quote ---
Well, I did check that, not a problem on the East Tester, and also the heatsink is further away from the back plate so you have to go really go in there to even touch the heatsink with a DMM probe.
There are some internal screws at the side of the heatsink though, that potentially touch the sides if they dent. So I did put some felt pads on those.
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