Electronics Forum | Sat Feb 11 18:33:36 EST 2006 | KEN
One factor everyone overlooks is that furnace and external T/C wires are (generally) not calibrated. Unless you are sending your wires to a lab for NIST characterization your T/C wires are NOT calibrated. They (new wires)operate within a specifie
Electronics Forum | Mon Feb 13 09:31:19 EST 2006 | stepheniii
I believe I understand what Ken is talking about. Most "calibrating" is done but applying a known voltage to the thermocouple reader. But what if the thermocouple wires are not producing the expected voltage? I bet your paperwork is for just the r
Electronics Forum | Mon Feb 13 13:19:35 EST 2006 | pjc
ECD's OvenRIDER is the only instrument I know that can measure thermal transfer efficiency of a an oven. I suppose it would work for environmental chambers too. This instrument has thermocouples to measure ambient temp of oven zones and well as hi-ma
Electronics Forum | Mon Feb 13 17:27:19 EST 2006 | PWH
I have not used one of these jigs. We just make sure and reset feeder B offsets before every build. We've also got good at guessing where a missed pick-up is just by looking at the position of the tape pocket in relation to adjacent feeders and cha
Electronics Forum | Tue Feb 14 09:30:42 EST 2006 | cyber_wolf
Pardon me for being so bold, but I still cannot understand to this day why solder paste thawing is an issue. I am not sure what types of paste you all are using but it has been my experience that the only thing you gain by refrigerating is 3 months
Electronics Forum | Mon Feb 13 22:37:40 EST 2006 | KEN
Cleaning no-clean is the pitts. If cleaning required migrate to water soluble. Can IPC help here? No cleans only need to be removed per IPC if the joint inspection is inhibited...and in general if form-fit-funciton is not achievable. But then th
Electronics Forum | Mon Feb 13 13:26:21 EST 2006 | pjc
If you're asking about wave solder machine, yes you can run Sn/Pb in a "Pb Free" machine. The concern is that when its time to run Pb Free you're going to have to remove all the parts from the solder pot to remove all the Pn/Pb solder residue from po
Electronics Forum | Wed Feb 15 07:21:08 EST 2006 | rlackey
Or ask your board house to make the change for you - ours always do small mods like that for free, then send you back the updated Gerber. Regarding the layer changes, whenever we tried editing gerbers out of their original package we always had issu
Electronics Forum | Wed Feb 15 07:28:08 EST 2006 | tk380514
Well thats what i was thinking of doing and i am not worried about the designer of the PCB. He truly is a dick and i have had many fights with before about wave soldering pad sizes yet he insists he is right but i change them anyway and send the orig
Electronics Forum | Wed Feb 15 09:00:46 EST 2006 | GS
if you look at the J-STD-033B, you will see that such a large PQFP could stay even longer the 24h at 125�C even if internally is already totally dry. It could be, the balls can get oxided and also IMC (Inter metallic compounds) could grow avery littl
