Christopher and Techies I need to correct your SIR methods: Please read IPC-TM-650 2.6.3.7 and you should also read through the new SIR Handbook IPC 9201A If you are testing no-clean, run 40C 93% not 85/85. The recommended voltage should be 20v/mm = 5v - no reverse bias Measurements at 20 minute intervals. The spec you quoted was discredited around 10 years ago. Chris Schaefer - I would strongly recommend that you run such tests for process characterisation using the new IPC B52 coupon. This allows for component over-mounting to mimic what will happen in the actual assembly processes. Graham Naisbitt Gen3 Systems - Engineering Reliability in Electronics On 11 Jan 2008, at 13:31, Christopher Nash wrote: > Chris I have listed most of the differences between the IPC SIR and > the IPC > ECM below. > > Test Board: SIR (B-24), ECM (B25) > Board Pattern Spacing: SIR (.020"), ECM (.0125") > Cleaning: SIR [Zero Ionics (Omegameter)] ECM (Clean to 4E10 Ohms) > Temperature/Humidity: SIR (85°C, 85%RH, 168 Hours), ECM (65C, 85%RH, > 500 > Hours) > Stress Bias: SIR (45-50 Volts DC), ECM (10 Volts) > Pre-Bias Stabilization Period: SIR (3 hours at T&H), ECM (24 hours > at T&H) > Measurement Bias: SIR (-100 Volts DC), ECM (45-50 Volts DC) > Time Readings: SIR (24, 96, 168 hours), ECM (96, 500 hours) > Dendrites/Corrosion: SIR (None > 25% of Spacing), ECM (None > 20% of > spacing) > > Christopher J. Nash > Indium Corporation > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Schaefer > Sent: Thursday, January 10, 2008 6:02 PM > To: [log in to unmask] > Subject: [TN] ECM or SIR - What Electrical test is best? > > Techneters, > > I am having to perform some tests to qualify the wash process using an > alternative cleaning chemistry and would like to know what the real > differences are between the ECM and SIR tests besides the time it > takes to > perform the test measurements. > > Thanks Much, > > Chris > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 > 847-615-7100 ext.2815 > ----------------------------------------------------- > > > ***This email, its content, and any files transmitted with it, are > intended solely for the addressee(s) and may be legally privileged > and/or confidential. 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