Principle and Use of PCB Test Frame and PCBA Test Frame

In the process of electronic manufacturing, testing is a key link to ensure product quality.

Working Principle of Test Frame

The principle of PCB test frame and PCBA test frame is very simple. They are connected to the pads or test points on the PCB board through metal probes. When the PCB board is powered on, the voltage value, current value and other typical values and phenomena of the test circuit are obtained, and the obtained data are used to determine whether the product is qualified.


Principle of PCB Test Frame

PCB test frame is a tool for detecting the electrical performance of PCB board. Its basic principle is to contact the test point on the PCB through a probe or test needle, apply a signal and detect the response to check the electrical characteristics and connectivity of the circuit board.

Composition of PCB Test Frame

The PCB test frame is customized, and is determined according to the size of the PCB board designed and produced, and the position of the solder joint. Main components: Test probe: contact with the test point on the PCB. Probe seat: fix the position of the probe to ensure that the probe is accurately docked with the test point. Spring mechanism: provide probe contact force to ensure good contact. Test interface: connect the test instrument for signal transmission and data acquisition.

Purpose of PCB test stand

Short circuit and open circuit test: mainly used to detect the continuity of the circuits between various points of the PCB board to ensure that the product will not have unnecessary short circuits, open circuits and open circuits.

Resistance, capacitance and inductance measurement: measure the electrical parameters of each component on the PCB to ensure that it meets the design specifications.

Functional test: verify the working performance of the PCB under specific conditions.

Principle of PCBA test stand

PCBA test stand is used to detect PCBA boards with assembled components. Its test principle is similar to that of PCB test stand, but more complicated because it is necessary to check the functions of each component and the working status of the entire circuit.

Composition of PCBA test stand

PCBA test stand is dedicated to special boards. It is composed of various external instruments, interfaces and accessory circuit boards according to the size of the produced PCB finished board, the location of the test points, various external instruments, interfaces and accessory circuit boards. Commonly used materials include acrylic and bakelite to make the theme frame, equipped with some contact pins and wire links, which constitute a simple test stand.

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Functional test probe: used to detect various functional points on the PCBA.

Jig or fixture: fix the PCBA board to ensure stability during the test.

Test interface: connect various test equipment, such as oscilloscope, multimeter, signal generator, etc.

Control system: usually includes software and hardware, used to control the test process and data recording.

Purpose of PCBA test stand

The PCBA test stand is almost a must-have detection tool in the PCBA production process. Its main function is to test the finished circuit board and determine whether the entire PCB board is successfully welded through the actual displayed signals, sounds, images, temperatures, etc.

Functional test: verify whether the PCBA functions normally under various working conditions.

Performance test: measure the performance parameters of the PCBA under load conditions, such as voltage, current, power, etc.

Thermal test: check the working stability of the PCBA under different temperature conditions.

Durability test: simulate long-term working conditions to detect the reliability of the PCBA.

The quality of the PCBA test stand is related to the efficiency and pass rate of the test. Due to its long-term and frequent operation, it has high requirements for its quality.

PCBAMake is a company specializing in the research and development and production of electronic product circuit boards, mainly undertaking multi-layer, high-density mass production, fast board, and proofing business. With an average of more than 20 years of work experience, the PCBA team can communicate professionally and efficiently to ensure the progress of PCB production and help you seize the market opportunity one step ahead!