PCB electrical test is a very important step in PCB manufacturing process. The purpose is to check whether there is open-short circuit problem in PCB board, and ensure that the finished product can meet the requirements of customer's electrical performance. There are many kinds of methods of PCB electrical test for PCB manufacturers. The most commonly used methods are flying probe and testing jig test. Let's take a brief look at these two testing methods.
Flying probe is one of the methods to check electrical PCB function (open-short circuit test). The flying probe uses four to eight independently controlled probes to move to the component under test. The UUT (unit under test) is transported to the tester by belt or other UUT transmission system. Then fix the probe of the tester to contact the test pad and via to test the single component of the UUT. The test probe is connected to the drivers (signal generator, power supply, etc.) and the sensors (digital multimeter, frequency counter, etc.) through the multiplex system to test the components on the UUT. While one component is being tested, the other components on the UUT are electrically shielded by the probe to prevent reading interference. The flying probe for general samples and small batch PCB boards can reduce the cost of making the testing jig, thus reducing the time for making the testing jig and shortening the delivery period.
Traditional testing jig test is another method of batch PCB board testing. It is necessary to prepare test data in advance, send the data to the tester supplier to make testing jig, each product model has corresponding testing jig, and then fix the testing jig on the tester to start the on-off test. This test method is fast, and is generally used for batch PCB testing.