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The difference between circuit board flying probe test and test rack test in PCB board industry

source:Industry News release time:2021-09-13 Article author:sznbone Popular:pcb

The difference between circuit board flying probe test and test rack test in PCB board industry

Source: Industry News Release time: 2021-09-13 Article author: sznbone Hot: pcb

In the process of PCB production, it is inevitable that short circuits, open circuits, and electrical leakage caused by factors, as well as the high, small and defective boards of the PCB circuit board, and the multi-level evolution, if the defective boards can be screened out in time In addition to the improvement of process control, the improvement of testing technology is also to provide PCB board manufacturers with solutions to reduce scrap rate and improve product yield.

The difference between flying probe test and test frame test in PCB industry (Figure 1)

The electrical testing methods include: Dedicated, UniversalGrid, Flying Probe, E-Beam, Conductive cloth (glue), Capacity, and brush Test (ATG-SCANMAN), among which there are 3 types of equipment most commonly used, which are dedicated tester (PCB automatic general tester), high-quality general-purpose tester and flying probe tester.

Flying test needle machine

First of all, in terms of the application purpose of the test technology, flying probe test is currently the most suitable electrical test equipment for small-scale production and samples. The cost of participating in the test is fatally increased, and whether it is used for different levels of PCB boards, as long as the output reaches a certain number, the test cost can reach the standard of large-scale economy, and it only accounts for 2 to 4% of the cost. This is why The use type and the special type are the output of the existing test models.

The flying tester is an improvement of the traditional needle bed on-line automatic high-pressure movement of a special test needle machine. It replaces the needle bed with needles. On the XY mechanism, the needles move at a high speed with 4 heads and 8 test needles. The smallest The test gap is 0.2mm.

The test unit (UUT) is transmitted to the test machine through the belt and other UUT transmission system during work, and then the probe of the test machine is contacted or tested on the test platform (TESTpad) and the fixed test hole (via), so that the test unit (UUT) ) The test probe is connected to the driver and sensor through the multiplex system to be the component on the UUT. A test component is being tested, and other components on the UUT are electrically shielded by preventing the probe from being electrically shielded to read interference.

Flying test needle machine can check short circuit, open circuit and component value. A camera was also used in the flying probe test to help find missing components.

With precision positioning and repeatability reaching the range of 5-15 microns, the flying probe tester can accurately detect UUTs. Flying probe testing solves a large number of existing problems in PCB circuit board assembly: such as a test cycle of 4-6 weeks; cannot economically test and develop small production; and cannot quickly test prototype assembly.

PCB board testing machine

Flying probe test is a system for checking PCB circuit boards. Bed-of-nails) interface bird test uses four independent control pins to move to the component under test. The test unit (UUT, unitundertest) is transported to the testing machine through a belt or other UUT conveying system. Then fixed, the probe of the testing machine touches the test sensor (test board) and the orientation hole (pass), thus in the test unit (UUT). The test probe is connected to (signal generator, power supply) and (components on UUT) and (components on UUT) components through a multiplexing (multiplexing) system. When a component is tested on the UUT, the other components of the UUT are electrically shielded by the prober to shield interference.

PCB circuit board

What is the difference between a flying test pin and a test stand? What are their respective advantages?

Flying probe test: It uses 4 pipes to conduct high-voltage insulation and low-resistance test on the circuit board (testing the open circuit and short circuit of the circuit) without the need for test fixtures. It is very convenient to directly install the board and run the PCB test program test, saving It reduces the cost of testing, enlarges the time for making test racks, and improves the efficiency of output testing, small tutorials and templates.

The shelf test is a plug-in test for the on-off test of the mass-produced PCB board. The production takes place and the production speed is increased. There is no charge for returning the order.

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