Electronics Forum | Tue Sep 02 13:35:29 EDT 2008 | evtimov
Hi, I don;t thing there is an overtemperrature sensor. Just the thermocpouple returns a higher temp(voltage) to the controller and your software goes to alarm, cooldown or what ever it does. Emil
Electronics Forum | Thu Sep 04 02:43:09 EDT 2008 | benefon
Thanks This error only occurred with one oven profile with the reflow zone temperature set at 270�C. Perhaps it really has to do with the exhaust pull as the oven is operating very near its temperature limit with this profile. I will check that. Tha
Electronics Forum | Tue Sep 02 22:23:27 EDT 2008 | davef
ANSI-J-STD-001: * Temperature and Humidity * Lighting * Maximum noise limit * Eating, drinking, and using tobacco products in the workarea ANSI/ESD S20-20-1999, Table 1- ESD Control Program
Electronics Forum | Tue Sep 02 13:30:11 EDT 2008 | hermes
Try this. Basic reflow profile build up and explanation of its parts: ramp-up, soak or no soak, peak, cooling. Good starting point.
Electronics Forum | Tue Sep 02 09:32:45 EDT 2008 | eliezerk
In order to check pcb quality by HASL TIN thickness plating repeatability, looking for any specification for the above.
Electronics Forum | Tue Sep 02 22:21:26 EDT 2008 | davef
IPC-6012 Table 3-2. States "Fused tin-lead or solder coat - Coverage and Solderable". The lack of any specific dimension criteria doesn't make this any less a requirement. There must be complete coverage of solder on the land, and it must be wettable
Electronics Forum | Wed Sep 03 07:36:39 EDT 2008 | vladig
That is why it has to be a few micron thick. Otherwise, it will form a layer of intermetallic which is extrremely difficult to solder to. Vlad
Electronics Forum | Wed Sep 03 07:43:13 EDT 2008 | davef
What do you mean by a "few micron thick"? IMC thickness pre-cycling (NEMI Lead-free) * Cu3Sn: 3um [118 uin] * Cu6Sn5: 1um [40 uin]
Electronics Forum | Wed Sep 03 09:27:19 EDT 2008 | stepheniii
Do you mean "at least a few microns" or "no more than a few microns"?
Electronics Forum | Wed Sep 03 11:52:58 EDT 2008 | stepheniii
But Vlad was talking tin and Davef gave intermetalic thicknesses which Vlad said needs to be avoided by having a few microns of tin. I'm not 100% sure but I suspect that DaveF is not convinced that Vlad knows what "intermetalic" means.
