We use AOI(Automatic Optic Inspection) machines to inspect all the inner layer circuits.

We either use the Bed of Nails Fixture method or the Flying Probe method to perform the testing in the circuit board manufacturing process. It depends on the total volume (here we calculated by square meters).We would select a testing method based on the following thresholds:
Flying Probe testing: less than the total volume of two square meters
Test Fixture testing: greater than the total volume of two square meters.

Flying probe testing cost would be cheaper in the first time comparing to the test fixture, but for repeated orders, it will be charged again. Test Fixture is a inital cost and only charged from the first order, no matter small volume or big volume, there is no cost for repeated orders.
The following TESTING REPORTS will be dispatched with our PCBs in the carton on every POs.
1. RoHS Compliance Report (COC)
2. Outgoing Inspection Report
3. Electrical Test Report
4. Micro Sections
5. Micro Sections Report
6. Solderbility Sampling Boards
7. Test Coupon (For Impedance Controlled PCBs)
8. TDR Test Report (For Impedance Controlled PCBs)