Electronics Forum: ppm calculation (Page 1 of 5)

Industry benchmark ppm number

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....

Quality calculation for SMT

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

Re: Industry benchmark ppm number

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....

Re: Quality calculation for SMT

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

Re: Quality calculation for SMT

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

Data for PPM and DPMO Calculation

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

Re: acceptable defect rates for smt process, in ppm.

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

DPMO calc and Overall Manufacturing Index (OMI) calculations

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

SMD PPM data

Electronics Forum | Fri Aug 26 21:23:38 EDT 2005 | Jes�s Salinas

Hello , In our case we take the results from the repair station. Each test station has its own repair station so from there we count the process defects : placement and printing. The formula used to calculate PPM = DEFECTS / (PARTS PER BOARD x UNITS

Data for PPM and DPMO Calculation

Electronics Forum | Thu Jul 03 08:53:27 EDT 2008 | rgduval

I would...and then use the data of the known issues as part of the secondary analysis. The defect is a defect, one way or the other. You can use the secondary analysis of your PPM numbers to continue to drill down in the process. If your overall P

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