I have a question about some SIR results that I got. I made a few consecutive SIR tests on a coupon and found that the ohm reading kept on increasing the longer I left the coupon inside the humidity chamber (35C, 85%RH). My understanding is that the reading should normally decrease with the elapsed time, indicating the lowering of surface resistance, right? I ran the coupon for 1 week, at first the ohm reading looked OK (~2-5e11 ohm), but at the end of the week the reading esceeded 1e12 ohm. I am confused. T.G.Yee Hadco Kuching ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################