Electronics Forum: patterns sir (Page 1 of 2)

S.I.R. Of PCB

Electronics Forum | Tue Aug 23 09:53:05 EDT 2005 | davef

There's some good background information on SIR [surface insulation resistance] on the web. Here's an example: http://www.tracelabs.com/TechLibraryDoc.aspx?id=4 Look to IPC-9201 - Surface Insulation Resistance Handbook SIR readings vary with: * C

SIR Testing

Electronics Forum | Tue Jul 04 02:31:55 EDT 2006 | Mustang

Calling for an input from the Experts our there. Our customer is questioning the cleanliness of the no-clean product that we produced for them. We were asked to clean the board (localised cleaning) after rework (IC need to be changed due to an up re

Tombstone defect

Electronics Forum | Mon May 26 04:02:13 EDT 2003 | Franky

Dear sir, I think so with every idea , everyone is correct , paste , pattern of pad design ,profiling or solder mask on PCB ,and one of the cause of tombstone that I found is alignment of machine placing and solder printing , from my experience many

Re: No-Clean Paste Lab Test Evaluations

Electronics Forum | Sat Feb 14 19:35:51 EST 1998 | C. Lao

Mr Lao We have some specialist knowledge on this subject and offer both equipment and services for these tests. My first recommendation is that take coupons manufactured by your PC Fabricator and then samples at each manufacturing stage: Bare coupon

SIR Testing

Electronics Forum | Thu Jul 06 16:00:11 EDT 2006 | samir

Ionic Cleanliness Testing: IPC-TM-650, Test Method 2.3.25, Section 5, "Dynamic Extraction Method", is the most commonplace method in the industry to test YOUR PCBA's for cleanliness. Run it through your process as normal, and send it out for testin

SIR starting point...?

Electronics Forum | Mon Oct 21 22:15:36 EDT 2002 | davef

First, SIR data is heavily dependant on the test pattern selected. Be very careful when comparing the results of resistance readings taken from different geometric patterns. Second, if yer talkin': * Bare boards, yupper. * Finished assemblies impor

SIR Testing

Electronics Forum | Tue Jul 04 08:04:37 EDT 2006 | davef

The heat from a soldering iron will push raw flux across the surface of the board and into surprising places. It's bad practice to squirt liquid low residue flux on the board during rework, because the portion of the flux that does not get heated pr

OSP and SIR

Electronics Forum | Wed Aug 21 17:44:32 EDT 2002 | davef

Splitting hairs, I expect SIR of all solderability protection, including OSP, to decrease after reflow. What�s more, I expect the SIR of all solderability protection to pretty much decrease over time. The �comb pattern� test specimens meet requirem

Re: Solder paste print with two thicknesses

Electronics Forum | Tue Oct 13 04:34:53 EDT 1998 | Sanjay Bhatikar

Sir, I have been thinking about your problem. I have a suggestion that may work, although it has not been tried before. How about using two stencils? First print the the whole board with a stencil for 150 micron thickness. Next, place a ste

Re: Liquid, Dispensable Solder Mask

Electronics Forum | Tue Mar 21 20:33:09 EST 2000 | Dave F

Shane: We don�t dispense, but we have thought about it. Several points about peelable solder masks in a no-clean (low residue) process: � Beware of latex peelable solder mask with a low res process without extensive testing. The problem is usuall

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