Electronics Forum | Fri Jun 18 03:31:38 EDT 1999 | Frank
| | Hello, | | I am looking for the surface resistivity and volume resistivity of standard fr4 as a function of temperature and /or humidity . can any one help? | | | | Frank: Sorry I'm so late getting back to you. | | 1 Use either ASTM D5109-
Electronics Forum | Thu May 14 14:48:45 EDT 1998 | Dave F
We understand that testing for ionic contamination and surface insulation resistance measure different properties. We assemble printed circuit boards for other companies. We will not get combs on 90% of the boards that we assemble. We have no custo
Electronics Forum | Tue Sep 24 14:29:32 EDT 2002 | stepheno
We have a board with 16 SMT connectors, side by side. We get some unsoldered pins on the connectors. There is about a half inch gap between them. The enigeer in charge of the project said it would cost too much to make something and didn't think it
Electronics Forum | Fri Dec 06 10:16:57 EST 2002 | davef
Bare board cleanliness is still primarily measured by resistivity of solvent extract (ROSE) using instruments such as Omegameters and Zero Ions. What is considered as "acceptable" cleanliness varies between specification and from company to company.
Electronics Forum | Thu Sep 04 21:50:47 EDT 2003 | davef
We like to use "enameled wire" that can be stripped by hot solder. Formvar [105�C] will not do that. Formvar was designed to with stand the hot oil seen in transformers. So, it requires either chemical or mechanical stripping. Most polyurethanes
Electronics Forum | Wed Oct 29 23:40:29 EST 2003 | ppcbs
We here at Precision PCB Services, Inc. Perform selective ball removal. We just completed a job today where we removed 4 balls, and then installed traces to dog-bone the pads at two locations on 30 BGA's. An eaisier and more cost effective solutio
Electronics Forum | Thu Nov 13 11:49:50 EST 2003 | pbarton
Adam, Not had any experience of the stuff myself but a quick Google reveals that KF1280 is 'Vernis de Protection' (French for Protection Varnish), available in aerosol cans. try this link: http://www.gotronic.fr/catalog/circuits/aerosol2.htm Unless
Electronics Forum | Mon Apr 12 11:32:47 EDT 2004 | Luis Lazcano
Can you share some information on the hazardous materials and cleaning details for your manufacturing processes, please ? These are the questions I need to ask you: 1. Do you use brominated fire retardant in PWB material? If not, what other type
Electronics Forum | Fri Jan 13 06:54:12 EST 2006 | pjc
Here's a couple more: Vitek Coating Div., Vitek Research Corp. - Derby, CT - Contact Service Company Company Profile: Parylene Conformal Coating Services With Plasma Surface Treatment To Enhance Adhesion. Electrostatic Powder & Liquid Coating Of Med
Electronics Forum | Wed Feb 01 04:29:37 EST 2006 | rlackey
That would be the lightning effect, with increased humidity reducing resistance. 1500 VDC or 1500 VAC? What is the distance between the edges of the pads - i.e. not the pitch of the component, but the actual physical distance between conductors? A
