On 5/11/07, Vitaliy wrote: > Thank you for the suggestions. > > After further tinkering, we figured that we were probably running ours too > hot (400C+), and it has some sort of thermal protection. This doesn't > explain the behavior I described, though ("actual temp" display/"element on" > indicator not changing despite the heating element cooling down). > > Anyway, it works just fine at 300C+, which should be plenty for our > application. 300C is the air temperature at the heater. On a PCB with 6-10 massive ground layers where you have ceramic packages (IE like RF amplifiers or 1206/1210 etc with no thermals on ground) the PCB temperature will be below 250C for a long time... You need 350C like the fish water. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist