Earl , would you drill the chip or the card ? I just thought if you'd make 1/2" went hole you'd alter the thermal mass and flow readings ; apart from the Azteque ritual ? To prick (and save) the card could do ? Seal if you bottom chill on way ? paul > ---------- > From: [log in to unmask][SMTP:[log in to unmask]] > Sent: Thursday, 14 January 1999 13:44 > To: [log in to unmask] > Subject: [TN] BGA and profiling > > John, > > Saw your question about BGA. I'm not sure about your definition of > "balls." Do you mean > eutectic solder balls? > > When it comes to placement, most folks always use solder paste no matter > if the balls are > eutectic or high temperature types. Is this where you are going? Just need > clarification. > > As for thermocouples, I use a test board to set profiles for first time > BGA's as I'm sure you > do. For optimum placement for the most revealing and accurate readings, > drill a hole in one > or several BGA holes and insert the couples in them and measure temps "in > the solder joint" > as it is being formed during reflow. > > Earl Moon > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################