Electronics Forum: measling (Page 1 of 3)

Measling

Electronics Forum | Mon Jul 12 12:27:44 EDT 1999 | Doug Hotalen

I had parts replaced on SMT PWBs and the repair created measling defects. Reliability Question: Q1. Can measling be aggrevated or grow over time due to temperature cycling and moisture. Customer environment is -62C to +85C. Thank you Doug Hotal

Measling

Electronics Forum | Thu Oct 15 10:26:13 EDT 1998 | Dave Celestian

I have a problem with measling on our PCB's. We saw it on our FR4 PCB's at final assembly yesterday. Is this a defect from the board vendor or something we did in our assembly process when building the PCA's (thru hole). Could the wave solder mach

White spots on PCB

Electronics Forum | Mon May 14 22:24:11 EDT 2001 | davef

The time over liquidous of the profile seems short. But then again, who knows? Based on what you told us, I'm guessing at a board fabrication problem, either measling or delamination. Probably the former, rather than the latter. [Now, we remember

Re: Measling

Electronics Forum | Mon Jul 12 13:06:32 EDT 1999 | Earl Moon

I had parts replaced on SMT PWBs and the repair created measling defects. Reliability Question: Q1. Can measling be aggrevated or grow over time due to temperature cycling and moisture. Customer environment is -62C to +85C. Thank

Delamination / Measling

Electronics Forum | Mon Dec 08 11:46:09 EST 2008 | mleber

We are experiencing delamination / measling on card we have been running for years. No change in process. Same equipment, profiles etc. The weird thing is we are experiencing it on pwbs from different mfgs and different processes (reflow, wave, selec

PCB moisture content

Electronics Forum | Fri Jul 06 10:18:02 EDT 2007 | blnorman

According to IPC-A-600, measling can occur in epoxy-glass boards when the moisture content of the board is above 0.3wgt%. Is this the industy acceptance standard for max moisture content of a board?

Burn from Soldering Iron or Measling ??

Electronics Forum | Thu May 14 18:45:15 EDT 2009 | jax

I am having trouble determining what the IPC classification is for the attachment. Also... if a burn, is it a defect and for what classes? Thanks

Tombstone defect

Electronics Forum | Wed May 21 12:55:35 EDT 2003 | Zhenya

Several things for your reference: 1. Starting with data collection: - Have you done a measle chart to illustrate the pattern of the defect? - Have you checked the corelation between shift/time and defects rate? - How about a pareto chart? - Do

Burn from Soldering Iron or Measling ??

Electronics Forum | Thu May 14 22:45:46 EDT 2009 | davef

You're correct. It's a peculiar looking defect. With measling, we expect to see discrete white spots or crosses just below the surface of the base material. We don't see that here. We do see a similar condition at almost every PTH in the picture, a

What caused this reflow issue?

Electronics Forum | Mon Apr 14 14:11:30 EDT 2008 | cyber_wolf

I dont know if this is related, but there appears to be a blister/measle in the upper right corner of the Q19 large pad. (upper right of Q19 as you are facing the photo) If your profile and paste is good, my bet would be that there is something wron

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