In industrial electronics manufacturing, product reliability does not depend solely on electrical design or on the quality of the components used.

In practice, the difference between a stable product and a problematic one often lies in how the manufacturing process is controlled and what is validated at each stage.

Testing is not a final formality or an isolated quality gate. It is a key tool in process engineering, aimed at detecting deviations, reducing variability, and ensuring that the manufactured product behaves as designed—not only in laboratory conditions but also in real-world operation.

What happens when testing is not part of the process?

In many industrial projects, testing is concentrated at the end of the production line. Products are manufactured first and validated afterward.

This approach may work for prototypes or very small production runs, but it starts to fail as volume increases or when the product operates in demanding environments.

When testing is not integrated from the beginning, defects introduced in early stages—such as solder paste printing or component placement—are only detected when the cost of correction is already high. In the worst cases, failures appear directly in the field.

From an engineering perspective, a validation strategy aligned with the production process is essential.

What is the real impact of a poor testing strategy in production?

The consequences of insufficient validation are well known on the production floor:

• Increased rework, with direct impact on costs and lead times
• Intermittent defects that are difficult to reproduce and diagnose
• Loss of traceability, preventing identification of the root cause of failures
• Reduced long-term reliability, especially in products exposed to thermal or mechanical stress
• Problems during audits or certifications due to the lack of objective evidence of process control
  

From a business perspective, these issues translate into hidden costs and loss of customer trust.

Why should testing be considered part of process engineering?

From a process engineering perspective, testing is not a binary filter (pass/fail), but a process control mechanism. Each test should answer a specific question: is the process producing the expected result within the defined limits?

When testing is distributed throughout the production process, deviations can be detected before they propagate and become systemic failures.

What tests are essential in industrial electronics manufacturing?

There is no universal list valid for every product. However, in industrial environments there are several tests that are critical to ensure reliability, repeatability, and traceability.

At Fides Electrónica, we perform the following tests:

• Solder Paste Inspection (SPI) to verify correct paste deposition before component placement
• Automated Optical Inspection (AOI) to detect placement errors and soldering defects
• Electrical testing (In-Circuit Test – ICT), where passive electrical measurements are performed
• Custom functional testing, designed to reproduce the real operating conditions of the product
• Pruebas de seguridad eléctrica, particularly relevant for certain products
• Pruebas de rodaje, aimed at detecting early failures
  

The key is not to apply every possible test, but to select the appropriate ones according to the product and process risk profile.

How should testing be integrated into the production process?

A mature testing strategy starts during industrialization, not at the end of the line. Common best practices in industrial environments include:

• Defining the testing strategy before finalizing the process design
• Linking each test to a specific technical risk
• Designing custom test equipment when the product requires it
• Recording results with full unit-level traceability
• Using test data to adjust and improve the process, not only to accept or reject the product
  

This approach turns testing into a valuable source of information for engineering, quality, and production teams.

Frequently Asked Questions About Testing in Electronics Manufacturing

• Is a functional test at the end of the line sufficient?
  No. A functional test detects failures but does not explain their origin. Without intermediate testing, defects are detected too late and are more costly to correct.
• Do all products require the same tests?
  No. The testing strategy should be defined based on the product’s technical risks, regulatory requirements, and the characteristics of the manufacturing process.
• When does it make sense to develop custom test equipment?
  When the product has specific functionalities that cannot be validated using standard equipment, or when detailed traceability is required.
• Does testing increase manufacturing costs?
  In the short term it adds complexity, but in the medium and long term it reduces rework, field failures, and hidden costs.
• How does testing improve long-term reliability?
  It allows detection of latent defects and validates product behavior under stress conditions, not only under ideal laboratory conditions.

How is this approach applied in real manufacturing?

In industrial practice, reliability is not something that is “checked” at the end—it is built throughout the process. Integrating the right tests reduces dependence on rework and enables more stable and predictable manufacturing.

At Fides Electrónica, process engineering incorporates this approach through rigorous testing and product reliability validation. Custom test equipment is developed and different types of testing—from automated inspections to environmental tests—are implemented with full traceability and real-time data analysis as a natural part of the manufacturing process.

Through DFM (Design for Manufacturing) and DFT (Design for Test) analysis, we ensure that the product can be both manufactured and tested efficiently.