How do we control the quality ?
PCBA testing is the most critical quality control step in the entire PCBA manufacturing process.
The test determines the final performance of the products.
The test system connects to the PCB via test probes which connect to test points in the PCB. This electrically tests circuits and components against critical values.
Working with a test jig to test its functions and working method, a test jig is always combination of Test probes, connection cables, power supplies, and test software.
Manual test, generally is done by the visual inspection after above steps before packing.
Desipite the tests above, we manufacturers also do other tests base on customers' special requirements and needs.
Using high-speed and high-precision visual processing technology to automatically detect various placement errors and soldering defects on the PCB, fast and precise.
Using X-rays to penetrate the PCB board, obtain images on a dedicated image sensor, and realize the perspective projection of the circuit board, so as to intuitively judge whether the quality of the product is qualified from the image.
The principle of the test fixture is to connect the test probes to
the test point of the PCB board. When the power is turned on, the
key data such as voltage and current in the circuit are obtained,
and displayed on the display screen of the test rack to achieve the
purpose of rapid detection.
PCBA Function Test via a Test Fixture
The machine automatically scans the PCB through the
camera, collects images, and compares the tested solder
joints with the qualified parameters in the database. After
image processing, the defects on the PCB are checked,
and the defects are displayed/marked through the display or
automatic signs for maintenance .
Manual Test and Inspection Through Measuring the Working Voltage, Current and Board Working Status
To test the voltage and current of the board is the basical step before further test, to ensure the working status is normal and the assembly is fine.
The online programming uses the standard communication bus of the chip,
such as USB, SWD, JTAG, UART, etc. The interface is generally fixed,
and there are few pins that need to be connected during programming. Since
the communication rate of the interface is not high, the programming can
be completed by using ordinary wires without high consumption.
Online programming is to program programming through wire connection.
If an error is found during production testing, it can be re-programmed without
disassembling the chip.
Firmware Programming
