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Old 12-11-2021, 01:05 PM   #44
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,634
Default Re: New Cheap Chinese Soldering Plates

The magnets are at the far corners, on the feet. They don't get as hot. Not ferrite, it's some el-cheapo rare earth that are like candy over there. Many are good to >200C so who knows.

The heater resistance went back down to 220Ω when it cooled down BUT this morning it was 42kΩ
If I push down on the plate it drops to a few hundred Ω, depending on where I push. So I thought it must be cracked... but plugged it in anyway. It's still working fine.
So the PTC is non-linear it acts like a MOV it needs higher voltage to fully conduct. Good to know, it's not a resistive thing I would have been fooled by the ohmmeter reading. PTC must be made of zinc oxide granules.
Either that or my plate is busted.
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