Electronics Forum | Sat Apr 25 08:48:45 EDT 1998 | raymond
Is there an industry standard in calculating SMT process PPM level for benchmarking purpose ? What are the industry benchmark ppm number for some of the defects like solder short for 20-mil QFP, tomstone problem for 0603 components etc....
Electronics Forum | Sun Mar 22 15:29:01 EST 1998 | Michael Fogel
What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? Please replay to: fogel_m@netvision.net.il or micha.fogel@ecitele.com
Electronics Forum | Sat Apr 25 12:58:13 EDT 1998 | Earl Moon
| Is there an industry standard in calculating SMT process | PPM level for benchmarking purpose ? What are the industry | benchmark ppm number for some of the defects like solder | short for 20-mil QFP, tomstone problem for 0603 components etc....
Electronics Forum | Wed Mar 25 21:49:32 EST 1998 | Alberto Cervantes
| What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? | Please replay to: | fogel_m@netvision.net.il | or | micha.fogel@ecitele.com
Electronics Forum | Tue Mar 24 09:53:01 EST 1998 | Steve Schrader
| What is the right way to count the opportunities for defects in order to calculate the quality (in ppm) of SMT assembly processes as well as the quality of the PCB's? | Please replay to: | fogel_m@netvision.net.il | or | micha.fogel@ecitele.com Ch
Electronics Forum | Wed Jul 02 19:10:45 EDT 2008 | arminski
Hi, Say I'm going to calculate my PPM and DPMO, do I have to include in my defects data an item that the root cause is already identified? example is if I have 4 components with Land Design issues (incorrect dimension) and is causing me insufficient
Electronics Forum | Sat Sep 14 11:01:48 EDT 2024 | pradeep14
Hi all, Please let me know, AOI false call ppm are calculating by number of parts or number of windows used in the program. Thanks in advance
Electronics Forum | Tue Jan 18 20:31:10 EST 2000 | WDavidson
It makes a difference what the normalizer is. We calculate solder ppm and placement ppm separately for each assembly. Solder ppm = #solder defects*1E6/(Qty boards*#solder joints per board). For us this number is easily less than 50 and sometimes
Electronics Forum | Sat Sep 14 16:35:47 EDT 2024 | yannick_herzog
Defets per million opportunities: Number of defects per million inspection opportunities. It is best to ask your manufacturer how your machine calculates it. We use the defective parts to calculate the PPM. Kind regards
Electronics Forum | Tue Aug 28 13:46:46 EDT 2001 | mparker
To clarify on "Opportunities"- With 1000 components, the opportunities are far greater than 1000. You have 1 opportunity per component for a component defect i.e. bent lead, damaged part, tested bad, etc. You have a second opportunity per component
