Shirely as per the tm-650 , the difference is clearly defined between if tested with copper foil still on the circuit or if the test is performed in an area that has has the foil removed. It does not ref single or double sided. My point was why the tm-650 group highlighted this difference for DSC but no mention is made for testing by DMA. Regards -----Original Message----- From: Shirley Xiao [SMTP:[log in to unmask]] Sent: Thursday, September 20, 2001 8:19 PM To: [log in to unmask] Subject: Re: [TN] Tg measurements by DMA I guess you missunderstood the TM-650. I think the difference is between double sided and single sided or even unclad board right after press by laminator. There is no big difference if compare a double sided board with clad and withou copper foil by etching. --- Gerard O'Brien <[log in to unmask]> wrote: > When testing Tg with DSC, the TM-650 test method > calls out for the test to > be run with the copper clad still attached and that > if removed to expect an > 8 to 15 degree reduction in values. For DMA it does > not reference testing > with copper clad or removed. Can anyone give me the > reason why? > > Regards > > Gerard O'Brien > > ------------------------------------------------------------------------ --------- > Technet Mail List provided as a free service by IPC > using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] > with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt delivery of Technet send the > following message: SET Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line > Resources & Databases > E-mail Archives > Please visit IPC web site > (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at > [log in to unmask] or 847-509-9700 ext.5315 > ------------------------------------------------------------------------ --------- __________________________________________________ Terrorist Attacks on U.S. - How can you help? Donate cash, emergency relief information http://dailynews.yahoo.com/fc/US/Emergency_Information/ ------------------------------------------------------------------------ --------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------