About SMT processing flying probe detector

About SMT processing flying probe detector
SMT processing flight detector
The flying needle tester is an improvement of the on-line needle bed tester. The flying probe tester uses two or more sets of probes that can move within a specific test area to replace the non movable needle bed. At the same time, a mobile probe driving structure is added, which uses various types of motors to drive. The positioning in the horizontal direction contacts the test point in the vertical direction. The flying probe tester usually has 8 test probes, 4 test heads and a minimum test clearance of 0.2 mm. When working, move the test probe to the test point and make contact according to the pre arranged coordinate position program. Each test probe performs an open circuit, short circuit or component test on the assembled components according to the test procedure. The flight probe is selected according to the actual test needs and the shape of the test point. In addition, it is necessary to consider the height of the flight probe movement, the movement and angle of the probe to the test point, the direction of movement, the impact force, the search method, and other flight probe movements. The process details, especially the different heights of components on various assembly circuit modules, should be considered during programming. These data are usually not accurately given in the circuit design file.
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1. Basic Composition of Flying Needle Tester
1) Computer system
Circuit board

Computer systems are usually equipped with special instrument cards, video cards and driver cards for PC based test systems. If there are higher functional requirements, network hubs or workstation systems can also be used. The operating system and test software of flight detector test systems in Europe and the United States mostly use the current popular Microsoft Windows. The Japanese series online test system basically uses DOS, and the test software interface and operation are relatively simple and applicable.
2) Instrument and measurement module
Most instruments and measurement modules are located at the bottom of the test system, basically including test excitation signals and measurement devices. The types include programmable DC voltage and current source, multi-function waveform (sine, triangle, square wave) generator, clock generator, voltmeter, counter, pull-up/pull-down resistor, etc. Correspondingly, a switch system is integrated into the instrument interface card, which is used to test with different excitation signals or measurement equipment together with the test program.
3) Motion and drive system
For the basic flight probe movement, there are two types of horizontal and vertical movements relative to the working area. The level motion in Cartesian coordinate system can be divided into two types. The main purpose of xy drive is to find and locate test points through digital cameras. When the screw drive system moves, the drive arm moves; The vertical motion drive has only one purpose, that is, to contact the probe in the vertical direction of the test point. Generally, the contact between the probe of the flying probe test system and the test point will have a certain inclination angle, and the angle with the vertical direction is usually 5. The probe motion system requires fast and high-precision positioning capability. The probe support arm and probe movement are driven by a motor. Generally, y-axis is driven by brushless motor and precision lead screw with integrated encoder. Some manufacturers also use integrated encoder, such as air suspension and linear motor; The z axis of the probe is usually driven by a linear motor or a precision stepping motor.
SMT Factory Processing Flying Needle Detector
4) Test area
The specific test area of the flying needle line test system is usually equipped with an operation panel near it. In addition to the mechanical positioning device of the tested circuit board in this area, the bottom is usually used to expand the test capability of the flying pin line. Add auxiliary access device to connect to power supply, test excitation signal, non vector test device, etc. The general test area also has a protective cover to protect the safety of testers.

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