surface insulation resistance

"surface insulation resistance" search results in the Electronics Forums



37 results found for "surface insulation resistance" in the Electronics Forums

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How to choose a new solder paste

May 26, 2011 | How to choose a new solder paste Here's what I do: - Test Surface Insulation Resistance (we're in the high reliability market and use a test significantly harder than IPC's). I also test SIR in combination with other assembly materials like conformal coatings and wave solder fluxes. - Test

IPC J STD 004B Reliability tests

Dec 3, 2010 | IPC J STD 004B Reliability tests Hi In Dec 2008 the IPC J STD 004 was updated to 004B, and I am wondering what the new test conditions are for testing flux Surface Insulation Resistance and Electro Migration Potential within the new spec. I am looking for the recommended test temp / humidity

Motherboard become NO POST when humidity increase to 90%

Nov 20, 2009 | ..Am I right? At the same time, we also found that wave flux solid content is out of specification. Its current value is 1.22wt% and spec call for 2.5% +/- 0.5wt%. Is there any relationship between low solid content and No Post issue?? Note: Surface Insulation Resistance (SIR) test for this flux

Cleaning procedure when WS609 flux is used

Jan 21, 2008 | money. Then, consider involving your encapsulant supplier and a failure analysis laboratory in: * Assessing the contamination level on your product. * Determining practical go / no go limits from ion chromatography analysis and possibly surface insulation resistance. * Instituting effective process

S.I.R. Of PCB

Aug 23, 2005 | S.I.R. Of PCB 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: * Comb pattern design * Board fabrication process * Board assembly process

How to improve the solder quality of QFN?

Jul 6, 2005 | but only if we have a

Cap Short

Nov 22, 2004 | shops use outside laboratories. * Surface Insulation Resistance. This test actually has a correlation with field failures. None relating to residue if resistivity is above a certain level. Guaranteed if its below a certain level. The level depends upon environment, panel design and circuit design

Solder paste change

Mar 31, 2003 | contamination levels of your old flux and new flux. * Run surface insulation resistance tests on your new flux. Continuing, J-STD-001, Appendix B talks to the qualification of new processes and process materials.

IONIC CLEANLINESS SPEC FOR BARE PWBs

Dec 6, 2002 | is another issue entirely

OSP and SIR

Aug 21, 2002 | 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 requirements concerning surface insulation

OSP and SIR

Aug 21, 2002 | OSP and SIR We are using OSP coated boards and no-clean solder paste. In a few instances, we are seeing increased distortion in an audio circuit. Has anybody seen or heard of surface insulation resistance (SIR) decreasing after reflow on OSP boards? Is it possible that the remnants of the OSP

Flux Conductivity

Aug 13, 2002 | but that doesn�t sound like what�s going on here. Your NC flux should not be particularly conductive. For instance, Kester 977 is Surface

adhesive on pads

Apr 1, 2002 | as either or both could be contributing to the problem. Closure on your moisture sensitivity concern: Use surface insulation resistance [SIR] testing as the bottom line of whether a residue is harmful. If SIR testing can show no detrimental leakage currents under humid conditions, no corrosion, no metal

omega meter

Mar 6, 2002 | the halides in the wash solution. Ion chromatography and surface insulation resistance are two other measures to consider. Personally, if I had a choice between ionic contamination testing and SIR testing (assuming both competently done), I would choose the SIR testing as the bottom line of whether a

IC Contamination

Oct 22, 2001 | er words to that effect. Various test labs

Contamination test

Jul 30, 2001 | combined halide effect, of the solvent. Oooo, oooo, one more thing; solvent extract testers are intended to process control tools

No Clean

Jun 12, 2001 | ="_blank">http://www.ipc.org] lists reputable test labs. Dionex [http://www.dionex.com] is the premier supplier. And if you have to ask the cost, you cannot afford it. * Surface Insulation Resistance. This test actually has a correlation with field failures. [No

Incoming Water Quality

Jun 11, 2001 | only large shops can maintain the equipment. 3c Surface Insulation Resistance. This test actually has a correlation with field failures. [No failures relating to residue, if resistivity is above a certain level. Guaranteed failures, if its below a certain level.] The level depends upon environment, panel design and circuit design (voltage, current, impedance, spacing

OSP vs HASL

May 14, 2001 | causes reliability problems. Surface insulation resistance (SIR) testing shows that OCC boards have comparable or better performance than HASL boards in high-temperature, high-humidity storage tests." � or words to that effect. If this doesn't aswage your other concerns: For US military [I think

Re: Help with flux residue spec

Nov 11, 1999 | environment? By the way, this situation is what spawned the SIR testing. SIR (surface insulation resistance)is just another method to quanify residues in terms of impact on circuits. 3. SIR testing is usually 'jobbed out' to a test facility and used to qualify the flux materials and the assembly processes

Contamination causing shorts.

Sep 25, 1999 | but can cause the same effect on high-impedance circuits. Electromigration is one phenomenon caused by ionic contamination and produces drops in surface insulation resistance. On the other hand, this is often confused

CSP/BGA Assembly Problems

Dec 31, 1998 | . | | | | The Surface Insulation Resistance (SIR) test does focus on the cleanliness beneath a specific component. It's conducted at elevated temperature and humidity (with a voltage bias) in order to accelerate electromigration and dendritic growths -- otherwise the test would take years. I believe that the results

CSP/BGA Assembly Problems

Dec 31, 1998 | not tell you whether the area under a specific component is contaminated. | | The Surface Insulation Resistance (SIR) test does focus on the cleanliness beneath a specific component. It's conducted at elevated temperature and humidity (with a voltage bias) in order to accelerate electromigration

CSP/BGA Assembly Problems

Dec 30, 1998 | the area under a specific component is contaminated. The Surface Insulation Resistance (SIR) test does focus on the cleanliness beneath a specific component. It's conducted at elevated temperature and humidity (with a voltage bias) in order to accelerate electromigration and dendritic growths

Batch Cleaners

Dec 9, 1998 | . Components have no cleanliness requirements. It's possible that both ionic and non-ionic contaminants require concern when using "modern" fluxes. ROSE testing has doubtful repeatability and accuracy. Surface insulation resistance (SIR) tests do not relate to ROSE test results. Ion chromatography tests do

Prove no-clean is clean

Sep 17, 1998 | " require LT 2 ugm per square. | TESTING METHOD | A. Surface Insulation Resistance (SIR) testing tells you the amount of loading that your flux is putting on the assembly, but it won�t tell you what is on the surface. It (IPC-TM-650 method 2.6.3) is a common way to assess the functionality, contamination

Prove no-clean is clean

Sep 17, 1998 | ;high tech apps" require LT 2 ugm per square. TESTING METHOD A. Surface Insulation Resistance (SIR) testing tells you the amount of loading that your flux is putting on the assembly, but it won�t tell you what is on the surface. It (IPC-TM-650 method 2.6.3) is a common way to assess the functionality

Ionic chromotography test on PCBA

Jun 5, 1998 | testing may fill your needs better and more cheaply than ion chromatography. It also is readily available. To achieve similar results, concerning possible electrical conductivity (shorting) on the surface of PCB's or PCBA's between conductors, may be done using surface insulation resistance (SIR) wherein

Approach To Contamination Testing Of PCBs

May 27, 1998 | Re: Aye aye aye. Wait Wait Wait | | | | | 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

Approach To Contamination Testing Of PCBs

May 27, 1998 | Re: Aye aye aye. Wait Wait Wait | | | | 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

Approach To Contamination Testing Of PCBs

May 16, 1998 | determine where bad synergy exists between different process materials. If you want more, let me know Regards, Graham Naisbitt | We understand that testing for ionic contamination and surface insulation resistance measure different properties. We assemble printed circuit boards for other companies. We

Approach To Contamination Testing Of PCBs

May 15, 1998 | Re: Aye aye aye. | | | 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 customer complaints

Approach To Contamination Testing Of PCBs

May 15, 1998 | Aye aye aye. | | 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 customer complaints about board

Approach To Contamination Testing Of PCBs

May 15, 1998 | Re: Approach To Contamination Testing Of PCBs | 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

Approach To Contamination Testing Of PCBs

May 14, 1998 | Approach To Contamination Testing Of PCBs 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 customer

No-Clean Paste Lab Test Evaluations

Feb 14, 1998 | Trend Analysis (FMTA) techniques. SIR testing measures the actual effects of contamination, whether ionic or non-ionic, on the surface insulation resistance of your representative assembly under

PCB equipment

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