Not sure what your units are here, I assume that you're using an electrostatic fieldmeter, and measuring at a distance of one inch from the surface. Our protective practices are designed to suppress levels at the workbench to less than 100 volts, or .1 kV. I believe that this is a realistic goal for someone using normal grounding practices, like static protective mats and personal wrist straps. Of course the sensitivity of your product is the primary consideration, and you should be asking your design engineers what levels are problematical for your product. If they tell you that you need to protect below 100 volts, you're probably going to need ionization. My guess is that 5000 volts could be a problem, if you find it directly on the workbench, or in localized areas where your ESD-sensitive product could be exposed. On the other hand, if you find this level at a point on a shelf that's 3 feet above the workbench, you're probably OK. -Joe -----Original Message----- From: Keach Sasamori [mailto:[log in to unmask]] Sent: Wednesday, August 18, 2004 9:24 AM To: [log in to unmask] Subject: [TN] Advice on values of electrostatic charge Posting for Edward Szpruch ([log in to unmask]) ---------------------------------------------------------------------- Hi, Recently we made some measurements concerning Electrostatic charge on different pieces of equipment in our clean room. I got the results from 0.05 kV/inc to 5 kV/inc , but I do not know what is considered tolerable and what should be treated asap. Pls advice directions Edward --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------