PCBA Testing

1. ICT test(In-Circuit Testing) in the main includes circuit on-off, voltage and current price, fluctuation curve, amplitude, noise, etc.

2. The purpose of the FCT test is to catch the poorly assembled board, through the simulation of the full-function test when the board is assembled into a complete machine, to catch all the possible defects in the circuit assembly board before the assembly into a complete machine to catch out, to avoid the assembly into a complete machine only to find the bad, but also all the disassembly and reorganization resulting in waste of time and loss of materials.

3. The fatigue test shoulders the task of taking samples of the PCB assembly services for high frequency and long-term operation function, according to which to observe whether the product is faulty. There is no doubt that the probability of failure in the test can also be well judged. Another point to mention is that it can give excellent feedback on the operation properties of circuit assembly boards in electronic products. This enables us to make timely adjustments for problems.

4. The test in harsh surroundings is especially to show the PCBA board to the limit temperature, humidity, drop, splash, and vibration to get the test results of random samples, therefore inferring the reliability of the entire batch of PCBA board merchandise.

5. The Aging test is especially to power circuit card assembly board and electronic merchandise for an extended time, keep them operating and observe whether or not there’s any failure, once the aging test electronic merchandise is sold in batches.

1. Consistent with the test needs and test board, the structure style of the fixture is applied once the management methodology is chosen. The load plate, pressure plate, and instrumentation module are designed, and also the load plate/pressure plate of the fixture is cheap.

2. The positioning of the fixture is correct, and also the tying up of the instrumentation ought to be sleek.

3.The fixture box layout is cheap, and the wiring and installation of the system area are spare.

4. The glass fiber /MIC/SPK/SIM card analog slot ought to be reserved and in an exceedingly quasi-area.

5. Jig’s reserved interface position ought to be correct, sufficient, and cheap layout.

6. The lock of the fixture box ought to be applied by suggesting that of case buckle or pressing buckle for straightforward replacement and maintenance.

7. Correct zero correction. The zero drift of the test fixture can amendment with the amendment of test conditions or different test fixtures, so the zero correction of open and tangency is incredibly necessary. Therefore, the FCT test fixture has electrical circuit and tangency correction Settings.

8. Once the jig is broken needle and aging are replaced needle maintenance and still use. If the fixture is broken on the far side repair and also the client changes it’s now not used, it has to be remade.

Printed circuit assembly test fixtures are sometimes tailored for a selected product, which may effectively improve productivity and shipping quality.

The producing method of the PCB population test fixture is as follows:

1. Consistent with the test needs of the tested merchandise and customers, the ultimate fixture management mode ought to be hand-picked for style, and also the pressure plate, load plate, and alternative modules ought to be designed.

2. The clamping plate or load plate within the style position should be correct, can’t let the merchandise within the test of the test plate press.

3. The positioning of the test fixture ought to be correct and also the instrumentation tying up ought to be sleek.

4. The test fixture can have a precise style of a box, place the test product within the within, and within the fixture, the style should keep enough area within the box, and the layout of the box should be cheap.

5. Test fixture reserved interface position ought to be correct, sufficient, and cheap layout.

After the PCB board assembly fixture is formed, the assembly boards plate and also the test fixture is positioned solely by swinging the PCB board assembly plate into the test fixture. The accuracy of positioning is closely associated with the producing technology of the test fixture.

To confirm the soundness and accuracy of the product, and avoid excess repair caused by the assembly method and operation methodology, PCBA makers can adopt PCBA test assembly to resolve the matter. However, the trade additionally stressed that PCBA test assembly isn’t a remedy, within the actual operation method, there square measure several places to concentrate to. Which of them square measure they?

PCBA test assembly method has to concentrate on things.

1. Once PCBA has to be upgraded, most boards can typically have eye changes. during this regard, the trade stressed that the traditional batch of various periods of PCBA motherboard, can’t be mixed with the aftermarket motherboard production, as a result of once mixed along production, terribly straightforward to steer to the mixed board, that is unfavorable to the later use of the electronic product. Therefore, in PCBA test assembly, it’s necessary to work out whether or not the ultimate use of the code is done in step with the customer’s needs.

2. Before the PCBA test assembly, the primary to get rid of the finger dirt, it’s best to wipe with dust-free material alcohol once more, and so operate, thus on avoid the user’s hands of the circuit card owing to this dirt caused by some key operation.

3. Anti-static, whether or not PCBA test assembly or different processes, ought to do a decent job of anti-static measures, the role of this step is to avoid the utilization of electronic products within the method of poor contact or power, which will improve the standard of product and use expertise.