Electronics Forum: ionic (Page 31 of 42)

Calculating PCB surface area

Electronics Forum | Tue May 14 08:04:58 EDT 2002 | robbied

Hi. Does anyone out there know of a way to calculate the surface area of populated PCB's? We build many different types, and until now have been using a water displacement method, which I believe to be fundamentally flawed. Our technique is to drop a

Blue Haze ( Not the same as Purple Haze)

Electronics Forum | Tue Sep 03 17:48:34 EDT 2002 | dphilbrick

My customer is finding a blue haze on some SMT pads after processing, kind of looks like a water spot on the surface of solder joints. It requires 20x mag and very good lighting to see. We have done 2 different ionic tests and the boards pass to clas

Aqueous cleaner water disposal

Electronics Forum | Tue Aug 27 13:52:24 EDT 2002 | Mike Konrad

MK, In most cases, if the machine is completely closed-looped (prewash, wash, prerinse, rinse, final rinse etc), then the water should not require changing. As with most inline cleaners, there should be a considerable amount of water loss in the cl

About the PCB gold finger contamination.

Electronics Forum | Thu Sep 19 02:45:33 EDT 2002 | bugsjoe

Thank you ur reply Dave. Let me explain our COB workflow: 1. unpack PCB (FR4,LPI,HASL)(the thickness of gold and nickel we can't be find)(No SMT before) 2. clean the pcb by rubber 3. blow the pcb by di-ionic gun 4. attach die by adhesive gel 5. cure

type 4 paste & type 5 - environment factors & process parameter?

Electronics Forum | Wed Nov 13 04:36:46 EST 2002 | iman

does anyone know what environment factors(specifications?) and process control parameters(printer & reflow?) are optimal for running SMT using type 4 and type 5 solder paste respectively? Any pitfalls to avoid? The product we have been asked to use

Ionizing pressurized air for pcb blow-off

Electronics Forum | Fri Feb 21 20:01:14 EST 2003 | MA/NY DDave

Hi This is a good one. Let me take a stab at it. First remind me, why is this air coming in carrying a charge. I think I remember yet it is always fun. Also hopefully it isn't carrying any compressor oils. There are some companys that make other t

Solder paste change

Electronics Forum | Mon Mar 31 11:10:43 EST 2003 | davef

First, most �thermal shock� recipes are not a reliability test. There is no relationship between the failures seem in these tests and in-use application. These tests show you the failures in these tests. That�s it!!! Second, accelerated life test

Flux residue?

Electronics Forum | Wed Apr 30 20:33:15 EDT 2003 | davef

Haaaa!!!! Yes, we�ve seen things like that. We found that a high input impedance amplifier worked fine in a room with a controlled environment and worked poorly in the sweat-shop portion of our plant. We were using good ol� WS609, straight water w

Low VOC stencil cleaning fluid

Electronics Forum | Wed May 21 14:44:38 EDT 2003 | blnorman

We currently use Vigon SC-202 in our spray in air system. SC-202 has 830g/l VOC content, so I don't know if that will help reduce your VOC's or not. We used Smart Sonic 440-R in ultrasonic application with great results, but we haven't tried it in


Electronics Forum | Tue Oct 07 14:23:37 EDT 2003 | Adam

The Omegameter (or Ionograph) detect contamination by measuring the conductivity of the solution used to extract the board. This conductivity number reflects the sum of all of the ionics in the extraction solution. Unfortunately, we can't sort out th

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