EC Jet ECPD Technology Electrolytic Capacitor Polarity Discriminating

EC Jet ECPD Technology ( Electrolytic Capacitor Polarity Discriminating Technology. ) On board electrolytic capacitor polarity and missing parts inspection.

The challenges on production line. Traditional ICT test systems. 1. Very low Electrolytic Capacitor polarity discriminating rate(30%-50%). 2. Unable to find out the capacitor miss part during the test. Missing Parts. Wrong Orientation.

Challenge on production line. Inspecting by human eyes not only waste of time and money but also un-reliable as well.

Traditional ICT Electrolytic Capacitor discriminate method. 2 Terminals 3 Terminals Leakage Current detect Method. + impedance detect method. Induce method. + Z- I- HP Test. Jet I+ + Z+ M + ~

Limitation of 2 terminals leakage current detect method. 1. Too long testing time to test. 2. DUT tested under rating (damage) voltage. + + I- I+ 3. High false rate.

Limitation of 3 terminals impedance test method. 1. Unable to verify the connectivity of the 3 rd PIN. 2. Too much variations of the characteristics of the capacitor. 3. Coverage rate about 30~50% level. Z- + Z+

Limitation of HP Test. Jet method. 1. Open 1 of the EC terminal reach the same induced voltage in HP pad. So, it is very difficulty to discriminate the polarity of EC. 2. Good for on board circuit capacitor small than 10 u. F. 3. Unable to work for P 4 mother board test. Because all the capacitor (including the capacitor which parallel in circuit design)much higher than 10 u. F level. M + ~

Characteristics of EC Test Jet. § For EC Polarity Discriminating Rate = 100%. § Explosion free EC Polarity Discriminating rate = 100%. § Ultra High Speed, on board 50 Capacitors Test time < 2 sec. § Parallel EC missing part detective ability.

EC Jet know how. Signal source ~ Response Signal BLACK V BOX source T(time ) Un-know network analysis model. V Response ~ M T(time )

Principle of EC Jet technology. V Source V T(time ) Response ~ M V T(time ) STD Digital Signal Processing. DFT DSP Pattern Match FFT F(freq. ) V DUT F(freq. )

Principle of EC Jet capacitor miss detection. V ~ M DSP Pattern Match STD F(freq. ) V DUT F(freq. )

Why parallel capacitors missing parts can not be found? Vcc C 1 C 2 ? C 3 C 4 ? Cn ? Tolerance of electrolytic capacitance = -20% ~ +50%

Test limitations of EC Jet. Temperature. DUT with normal temperature between 0° ~ 55°C , failure rate = 0, 100% able to test. DUT with temp > 80°C , failure rate : about 20% DUT with temp >60°C , failure rate : less than 5% Parallel Capacitor Huge value of capacitor affect the testing time (15 -20 ms /PCS), due to sampling time is a little longer. Explosion free capacitor needs long testing time. Due to the polarity characteristics of explosion free capacitor is not so clear as normal capacitor. Testing time as long as 200 ms/ pcs.

Concerned the contribution rate of the reverse polarity and missing part of electrolytic capacitor. Motherboard acceptable quality level (AQL) : Failure rates : less than 2000 ~ 4000 PPM( super high quality level ) or Less than 4000 ~ 10, 000 PPM ( so-so quality level ). Actual value of EC failure rate experiment on the production line of leader mother board maker of Ax company. Actual EC polarity failure rate : About 1, 000 ~3, 000 PPM / board level. Actual EC missing part rate : About 1, 000 PPM / board. Total failure rate : 2, 000~4, 000 PPM.

Human eyes inspection is overdo ! Actual EC polarity reverse rate : 1, 000 ~ 3, 000 ppm / board. Actual EC missing parts rate : 1, 000 ppm / board. Actual value experiments on Ax company’s production line. Failure rate : 2, 000 ~ 4, 000 PPM/board. In this case : 40 EC capacitors are on board. Failure rate = 50 ~100 PPM/component.

Benefits of EC Jet. Less Effort. Use old ICT: JET 300 TR 518. Use EC Jet Save 2 ~ 3 Operators. Use EC Test Jet. Higher Quality. Instead of human Eyes Inspection. Getting higher quality.

Conclusion of EC Jet. Profits Competitiveness Less efforts Higher quality EC JET