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In the PCBA production process will be used in the PCB test rack and PCBA test rack, PCB test racks and PCBA test racks are used to do what they are used for? Below is IPCB's introduction to the principles of these two test stands and their uses.
PCB test rack and PCBA test rack principle of operation
The principle of PCB and PCBA test racks is to connect the solder pads or test points on the PCB circuit board through metal probes, and obtain the typical values and phenomena of the test circuit, such as voltage value and current value, in the case of the PCB board being charged, and determine whether the product is qualified through the data obtained.
The price of PCB test probes can be as small as a few cents a piece, or as large as several hundred a piece. The price of PCB test probes is also affected by a variety of aspects, such as brand, type, specifications, market, etc. Before choosing to buy test probes, you should buy a PCB test probe that is suitable for all kinds of applications. Before choosing to buy test, should be a variety of understanding and comparison is necessary, the price of the probe is about a few tens of dollars each. The price of the probe is affected by a variety of aspects, such as brand, type, specifications, market, etc..
Composition of PCB test racks
PCB test rack is customised,according to the design and production of PCB board size, solder joints to determine the location. The main use of epoxy plates, metal probes, wires and detection of interface components. PCB test racks are divided into ordinary probe,micro-pin test racks, wire test racks.
The use of PCB test rack
PCB test racks are mainly used for PCB boards to detect the circuit between the various points of the bit, to ensure that the product does not appear unnecessary short circuit, circuit breakers and open circuit.
All PCB boards need to be tested to ensure 100% yield,there are two kinds of test pipes, one is flying probe test,one is the test rack, flying probe test is only suitable for modelling small quantities, large quantities must be opened test rack, because the efficiency of the test rack is fast.
PCBA test rack
PCBA test rack is a kind of equipment to test PCBA finished products. In the production of PCBA test rack,generally need PCBA processing plant to provide Gerber file and PCBA samples, so as to facilitate the production of test rack. At the present stage, the PCBA test rack is only installed with several pressure plate buckles on the test rack,relying on the thimble and the pressure plate buckle to fix the PCBA.When conducting PCBA function test, the PCBA is pressed into the pressure plate buckle by both hands to carry out the test. PCBA due to uneven force or downward pressure is not in place, easy to test the needle and PCBA contact is poor,largely affecting the efficiency and accuracy of the test; if the force is too large, the PCBA downward pressure, PCBA is easy to deform or damage, but also easy to damage the test rack of the test needle, wear and tear is relatively large.
Material preparation according to the data to determine the programme, need to prepare hardware data (electronic components), the relevant additional peripheral circuits, equipment, frame data (such as acrylic panels), glue, wires, screws, wire data, etc., in order to produce the programme to determine the material.
Determination and inspection of structural piping for PCBA test racks.
PCBA test rack wiring requirements
1.The wire opening should be opened out within 2mm, and the wire opening should be tinned first and the test pin should be tinned.
2.The soldered wires should not be swinging or loose.
3.Separate the strong and weak wires in the test stand and tie the wires with cable ties.
4.The connectors of the ammeter and voltmeter must be installed with a multimeter pen, and no banana plugs can be installed to test the current and voltage and other functions to ensure the safety of the operator.
5.High-frequency product models connected to the signal line must be masked wire to ensure the safety of the outer network grounded.
6.The test frame must be grounded to the outer shell of the fire cow.
7.Test frame should be installed fuse, can not be replaced by wire or other conductors, the original plug on the 13A fuse removed to remove, replace the fuse should pay attention to how much current needed to test the model, the principle of its replacement by the product's operating current of 8-10 times can be.
Selection of quality inspection points must follow the principle of comprehensive, effective, cost-effective.
PCBA test rack composition and use
PCBA test rack is specialised board dedicated, according to the production of pcb finished board size, test point location, a variety of external instrumentation, interface and accessory circuit boards to the composition, commonly used materials are acrylic, bakelite to carry out the theme of the framework of the production, equipped with a number of contacts with the ejector pin and the lead link, it constitutes a simple test rack.
PCBA test frame is almost a PCBA manufacturing process must be prepared for a test tool, its main role is to do a good job of testing the circuit board, through the actual performance of the signal, sound, image, temperature, etc. to determine whether the entire PCB board is successfully soldered.
The quality of the PCBA test stand is related to the efficiency of the test and through rate, because of its long-term frequent operation, the quality of its high requirements.