I still need to straiten out the warped sheet metal box for my 12AWG air core LISN. The distortion is so bad I can almost bounce on the chassis top like a trampoline (welded out of angle irons and 10 gauge plate) if I was a little fatter.. and I also need to make the coupler. Tried to make a box ended up with a armored beetle
Ah yeah, gotta be careful with those welds... didn't tack up, or too many/too long seams at a time?
For my part, I stick to (thinner) sheet metal, and bolted members... but mainly because I don't have a workshop to speak of.
![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif)
next up is the 1000A bus bar LISN
and I like that the OP LISN has torroidal inductors. Its usually made with open coils
Heh... I wonder what you'd even need 1kA for. Do telecom "rectifiers" go that high? Maybe...
Some power line facing equipment would (while also at much higher voltages(!!)), but I assume that's all by industry standards, or custom (as specified in contract). Or other specialty industrial equipment, but they're largely not going to care about emissions, or would evaluate the whole system (say, an aluminum smelting rectifier, as a unit, or as the whole facility).
Also used toroids on another one,
![](https://www.seventransistorlabs.com/Images/LISN2.jpg)
The various values ballast a particular isolation transformer (240VCT output, so I can even use it like a NA outlet if need be), which I measured having leakage inductance as the balance of the big inductors. Hence the single core for the longest winding, three cores for the other, and five for neutral (no inductance: normally grounded). The row of three single cores are the 50uH load-facing inductors. These were calculated to do, I think it was 15A RMS, 30A peak, at -30% inductance or something like that. Good enough for light loads and active PFC, just avoid using very peaky or high power loads. No biggie.
Tim