Double probe or flying needle testing method, the flying needle tester does not rely on the pin pattern installed on the fixture or bracket. Based on this system, two or more probes are installed on small magnetic heads that can move freely on the x-y plane, and the test points are directly controlled by the data. The dual probes can move within a range of 4 mils apart from each other. The probes can move independently and there is no real limit to how close they are to each other. The tester with two movable arm shaped objects is based on capacitance measurement. Press the circuit board tightly onto an insulation layer on a metal plate as another metal plate for the capacitor. If there is a short circuit between the lines, the capacitance will be larger than at a certain point. If there is an open circuit, the capacitance will decrease. Testing speed is an important criterion for selecting a tester. The needle bed tester can test thousands of test points, while the flying needle tester can only test two or four test points. In addition, when conducting single-sided testing with a needle bed tester, it may only take 20-305, depending on the complexity of the board, while a flying needle tester requires IH or more time to complete the same evaluation. The height of the solder pads treated with hot air leveling will affect the connection of the test points. Usually, bare board testing, online testing, and functional testing are carried out; By using a universal type of tester, it is possible to test a certain style and type of circuit board, as well as for special applications.
As for the needle bed testing method, this method involves connecting probes with springs to each detection point on the circuit board. The spring provides a pressure of 100-200g for each probe to ensure good contact at each detection point, and such probes arranged together are called "needle beds". Under the control of detection software, detection points and signals can be programmed, and the detector can obtain information about all test points. In fact, only the probes at the test points that need to be tested are installed. Although the needle bed testing method may be used to test both sides of the circuit board simultaneously, when designing the circuit board, all detection points should still be on the soldering surface of the circuit board. The needle bed tester equipment is expensive and difficult to maintain. Select probes with different arrangements based on their specific application. A basic general-purpose grid processor consists of a drilled board with a center spacing of 100, 75, or 50 mils between the pins. The pin serves as a probe and makes direct mechanical connections using electrical connectors or nodes on the circuit board. If the solder pads on the circuit board match the test grid, then the polyacetate film punched according to the specifications will be placed between the grid and the circuit board for specific detection design. Continuity detection is achieved by accessing the end points of the grid (defined as the x-y coordinates of the solder pads). Since each network on the circuit board undergoes continuity testing. In this way, an independent detection is completed. However, the proximity of the probe limits the performance of the needle bed testing method.
Kunshan Xinzhong Rhenium Electronics Co., Ltd. is a manufacturer specializing in the production of testing fixture probes, circuit board testing probes, semiconductor probes, photovoltaic testing probes, and other products. The products produced can meet the different needs of customers and have achieved remarkable results. The company has received recognition and praise from numerous customers in terms of product quality, supply speed, product prices, and after-sales service. Looking ahead to the future, New China Rhenium Company will continue to adhere to a "dedicated" work attitude, and strive to improve the quality, supply speed, price, and after-sales service of products that customers care about. We are dedicated to serving customers and meeting their needs is our unremitting effort; Welcome to call and write to us. May we have a pleasant cooperation!
