Not every printed circuit board has the same testing and handling requirements. Depending on the mechanical design, production volume, panel layout and quality requirements, two tried-and-tested types of fully automated test lines are used: testing before or after depaneling. Both approaches offer specific advantages and can be tailored to the respective production strategy.
Whether it makes sense to carry out an inspection before or after cutting depends largely on the mechanical specifications, the panel layout, quality requirements and production volumes. Both options have clear advantages and are optimally configured by ENGMATEC to suit the specific application.
Option 1 – Testing before depaneling
- For testing complete PCB panels
- Reduced handling times thanks to panel testing
- Maximum throughput with minimal downtime
- Efficient use of test adapters
- Ideal for automotive and industrial electronics
This variant is designed for in-line test lines that need to handle very high volumes in large-scale production. The test involves complete PCB panels, which are mechanically stable and easy to transport. The solution is also used when PCBs cannot be contacted when separated. The panel is automatically fed through the test line via conveyor technology and transferred to the respective test stations. By testing several PCBs simultaneously within the panel, particularly short handling and testing times can be achieved, especially for ICT and functional tests. The systems are compatible with all standard test systems and enable efficient, continuous testing at maximum throughput.
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Errors are detected at the panelboards and can be specifically removed before downstream processes incur costs.
Option 2 – Testing after depaneling
- Flexible inspection of individual PCB formats
- Detection of damage caused during panel cutting
- Integration of a wide range of inspection technologies into a single line
- Greater process reliability for sensitive products
This test line option is particularly suitable for high-volume production, enabling electrical tests to be carried out independently of nearby circuit boards or assemblies. Any damage caused by the separation process can be reliably detected during the subsequent testing process, and any contamination can be removed as required. The individual boards are fixed to carrier trays, which ensure stable and secure transport through the test line. Depending on the design, several PCBs can be placed together on a single carrier to optimise cycle time. The solution offers high flexibility in terms of PCB formats and allows the integration of a wide variety of test technologies within a single line. It is the preferred choice where high quality requirements apply and the actual product condition needs to be represented as accurately as possible.
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The testing process exactly represents the final state of the product – a clear advantage for quality-critical applications, such as in medical technology.
Features compared
Option 1 – Testing BEFORE depaneling:
- Ideal when the focus is on maximum throughput and stable printed circuit boards
- Early fault detection reduces downstream process costs
- No carrier trays required
- Lower costs for product-specific components
Option 2 – Testing AFTER depaneling:
- Optimal when sensitive products and the highest quality standards are essential
- Allows for more flexible PCB design
- Enhanced quality assurance
- Custom positioning of PCBs on the carrier
What type of test line should you choose?
Which option is the right one depends on the product design, production volumes and quality objectives. ENGMATEC supports customers with their selection right from the concept phase and implements bespoke inspection lines.
Please contact us for a free consultation – we can help you optimise your testing processes.
