We often receive this question from customer” what is a E-Tester?” and” how to do E-Test for FR4 PCB?” Hereby I would like to share with you how to use E-Tester to test PCB.
Best Technology in FR4 PCB circuit manufacturing filed since year 2006, we have more than 17 years experiences in PCB fabrication process. We can provide from the design to turn key service for our customer.
Let us come to today’s topic, now what is a E-Tester?
What is a E-tester?
E-Tester is tooling for test PCB during volume production. E-Tester was used to detect the electrical performance of PCB. It is the essential process to test the PCB by this tester before shipment.
As you may know that during PCB process flow, it might be caused some defects by external factors and this is unavoidable.
So, in order to reduce the loss before PCB goes to the next stage when it is assembled with components, Therefore, the E-Test plays important role in PCB quality control to segregate PCBs with defects from shipment to customers and that’s why most of customers require their PCB manufactures to do 100% E test before shipment.
The E tester mainly checks the open/short circuit for FR4 PCB.
How to do E-test?
Firstly, set up the E-tester on the testing machine and up test datasheet on the computer. Put the board to the E-tester to test the open/short circuit for board and dielectric strength.
Shorts Test: Check to make sure that NO current flows between separate nets by measuring the amount resistance between them.
Opens Test: Check to make sure there is current flow from one “node” to the next for every net on the board.
During the testing, test whether there is short circuit between different network routes of PCB; test whether the PCB network is open to each PAD, and whether the hole is open; Finally, Insulation strength test and the Impedance test.
If the trace open is found on the bare board, the failure location could be repaired or the bare board has to be scrapped. On the other hand, the cost will be increased when PCB goes to the next stage when it is assembled with components, mainly are the sorting cost, component cost and the assembly cost. The compensation ratio is 10 times or even more than the PCB cost and this damages PCB manufacturer’s profit. The worse case is when PCBA is installed onto the end product, the loss caused by defected PCB could be very painful, say up to thousand times of PCB cost. Therefore, the E-Test plays important role in PCB industry to segregate PCBs with defects from shipment to customers and that’s why most of customers require their PCB suppliers to do 100% E test before shipment.
If you want to know more about testing for FR4 PCB board, welcome to visited www.bestpcbs.com or email us, we are very happy to answer your question.
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Tags: PCB testing