Used For PCB HDI
With the increased interconnection density of pcb hdi, it’s important to ensure that your boards can handle both the physical and electrical stresses that will be put on them. Many different types of reliability testing methods are used to measure a PCB’s ability to handle both conditions, and the most accurate and complete evaluation is done using a combination of test techniques.
Structural reliability tests determine the board’s ability to maintain its physical form during operation. These tests are often more rigorous than functional tests, and can be performed in a variety of ways. One common method involves testing the PCB in a liquid, such as acetone or methyl alcohol, to simulate how it might react to a chemical spill or corrosion. Other tests attempt to simulate the stress of a moving device by subjecting it to vibration or shock testing.
PCBs are also subjected to thermal and electrical stress testing to evaluate their ability to withstand a range of temperature and power variations that can cause components and traces to fail. These tests can be performed during the manufacturing process, but it’s more efficient to perform them during design as well. This allows for faster turnaround of the pcb hdi and improves overall product quality.
What Reliability Testing Methods Are Used For PCB HDI?
Performing these tests during design can also help prevent costly errors during production, which can lead to delays in the time that it takes for the PCB to go from design to finished product. There are many different factors that can affect a PCB’s ability to handle temperature changes and power fluctuations, such as its solderability, hole wall quality, copper plating characteristics, and other lamination parameters. These test results can be used as a basis for determining the minimum thickness and laminate compositions required to meet design requirements.
Aside from the mechanical stress tests mentioned above, specialized reliability tests may be required for certain applications. For example, if the PCB will be mounted in a vehicle or aircraft, it might need to pass vibration and shock testing to simulate the movement that occurs during travel. These tests can also be useful in ensuring that the circuit board is able to cope with changes in air pressure during flight. In addition to structural testing, PCBs need to be able to handle thermal and electrical stress as well. These tests are determined by the type of environment in which the circuit board will be used.
Depending on the environment, these tests can include high-temperature and low-temperature thermal shock testing, weather temperature cycling test, or a thermal storage test. These tests are meant to simulate the environmental conditions that the circuit board might experience during operation, and help manufacturers verify that the materials they use can withstand these conditions. These tests can be performed in a laboratory, or they can be accomplished on-site by using a simulated environment that mimics real-world usage conditions. In order to conduct these tests, the manufacturer will need a testing system that can track temperature, humidity, and other variables, and that is capable of measuring the resistance of both the layers of the PCB and individual vias.
