Hi all. As feared before, it seems the Lugano test may only show a reactor at 900C... maybe a little higher is anyway the emissivity is reduced in the waveband 7.5-13um, .
This maybe an explanation for another mystery : the apparent negative temperature coefficient observed from 450 to 800W If you look at SiC heating elements, http://www.practicalcontrol.com.au/silicon_carbide_control.html you can see that from 450C to 1000C (Hot Rod) resistivity fall from 230% to 100%, and only grow again at 1000C http://www.practicalcontrol.com.au/images/graphs/silicon_carbide_res_temperature.png this is less than the observed excusion, but not far. some bad interpretation linked to the change in waveform may be responsible from aditional anomaly. It is also possible that the SiC be of different quality with a stronger NTC than "Hot Rod" ?
