Electronics Forum: ppm measurement (Page 1 of 5)

Why measure O2 ppm level in N2 environment

Electronics Forum | Wed Mar 05 08:12:56 EST 2003 | nifhail

Hi Mike, How do we measure the O2 ppm in N2 environment. I don't understand why the customer keep insisting me to use N2 instead of Air. I don't see the need for it as I done have any soldering issue. Can you share with me why N2 is needed at the fi

Why measure O2 ppm level in N2 environment

Electronics Forum | Fri Mar 07 10:51:53 EST 2003 | dphilbrick

Another value add of N2 is when you are running a gold over nickel process it is recommended that you reach a peak of 220c instead of 215 when running in air. When you add N2 you can maintain that 215 number with the same results. If you look at your

Why measure O2 ppm level in N2 environment

Electronics Forum | Wed Mar 05 11:45:04 EST 2003 | msivigny

Hello Yngwie, When we look at the technical benefits of using N2, you'll find that your customer is trying to get a better product. Now as we discuss just a few of the reasons to use N2, when O2 is present in the heating atmosphere it carries oxides

Why measure O2 ppm level in N2 environment

Electronics Forum | Fri Mar 07 12:27:04 EST 2003 | msivigny

Hello Doug, thank you for the additional commentary, it has reminded me of another reflow recommendation that I'd like to make in general for readers. It's not specific to O2/N2 in ovens but in the method for creating and managing profiles for numero

Cleanroom Basics

Electronics Forum | Thu Jun 23 12:23:35 EDT 2005 | jdumont

Thanks a lot guys, is there a way to measure air quality? Like ppm of airborne particulates? Thanks again

Outgoing QC Measurements for Board Operations

Electronics Forum | Tue Oct 21 09:28:11 EDT 2003 | bwet

In terms of an outgoing QC measurement does anyone have some guidance? If ppm defect rates are established is it per board or per solder joint? We are a contract manufacturter trying to establish such a measurements without having to cover old ground

N2 reflow

Electronics Forum | Sun Oct 15 23:31:39 EDT 2000 | mkwong

I have a question for N2 reflow, I want to know how difference of the O2 PPM in reflow oven then get the result? Now, we use the N2 to purge into BTU oven and measure the O2 PPM is about 1,000. but cannot find the difference to compare to compress ai

Normal percentage for returned parts

Electronics Forum | Mon Dec 15 08:19:17 EST 2003 | paul_bmc

I am looking for what our industry would consider normal for returned product, or more specifically returned product that was preventable. The measure could be either percentage of ppm. Has anyone seen this statistic published?

performance improvement

Electronics Forum | Thu Jun 20 18:56:31 EDT 2002 | stepheno

If you don't already have one, the best investment you can make in your case is a good thermometer/humidity meter. They are not at all expensive. Then record the temperature and RH about 4 times a shift. After a few weeks (maybe sooner) you can se

Re: Process Characterisation

Electronics Forum | Thu Nov 30 13:51:33 EST 2000 | Michael Parker

Thanks for the details. Next question- where is your first time pass rate measured? Is this at test? Do you have inspection gates at the end of each process step? To get to the root cause, you need the earliest detection. Collect attribute data by a

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