Electrical Verification Protocols Part #2: Functional Testing of Complete Circuit Assemblies
Part #2: Functional Testing of Complete Circuit Assemblies
Introduction
In the second part of our series, we delve into the verification processes for circuitry once components are mounted. This phase is crucial for assessing the functional integration and overall performance of our PCBs and FPCs. Through a series of targeted tests, we evaluate how individual components, and their interactions contribute to the circuit’s integrity, ensuring that each assembly meets our rigorous quality standards.
- Resistance, Capacitance, and Inductance Testing
Testing the resistance, capacitance, and inductance is vital for verifying that components on PCBs adhere to their functional specifications. For these measurements, we employ LCR meters, which are versatile and precise instruments capable of assessing all three parameters.
Detailed Testing Methods
LCR Meter Testing: Our LCR meters are integral to our testing procedures. They provide accurate and comprehensive measurements of resistance, capacitance, and inductance. This multifunctional capability ensures that each component—whether a resistor, capacitor, or inductor—meets its specific requirements and performs reliably within the circuit. By confirming that these elements adhere to their design specifications, we enhance the overall functionality and reliability of our PCBs.
- In-Circuit Testing (ICT)
ICT is one of the most comprehensive methods used to check the assembly and functionality of components on a PCB. It’s particularly valuable for complex circuits with high component densities.
Methodology and Considerations
This test requires a specialized fixture that contacts test points on the PCB, allowing individual testing of each component for functionality and correct behavior. The test typically involves various voltages and currents, tailored to the specific components being tested. Although this method is more costly and time-consuming, its thoroughness makes it indispensable for ensuring that complex PCBs function correctly in their final applications.
Have you reviewed Part 1? Begin with the foundational insights on electrical verification in PCB manufacturing to fully benefit from Part 2. Click below to read part 1.
