I know this won't help but you would need to know the surface area of the conductors and how much of that area is in paralell. You would be able to estimate capacitance from that. But I doubt you will be " perfectly " accurate. The easiest solution would be to get a good capacitane meter and measure an actual assembly. Charles Caswell Process Lead, PCB Frontier Electronic Systems -----Original Message----- From: Geoff Layhe [mailto:[log in to unmask]] Sent: Friday, August 16, 2002 11:06 AM To: [log in to unmask] Subject: [TN] capacitance Hi all, Can anyone direct me to a web page or formula for calculating the capacitance across a circuit board. I've been asked what is the capacitance across a 1.6mm FR4 board which has 10 kV on one side and 0 V on the other. regards Geoff layhe Private & Confidential: This e-mail message is confidential and is intended solely for the person or organisation to whom it is addressed. If the message is received by anyone other than the addressee please return the message to the sender by replying to it and then delete the message from your computer. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------