We use Thermovision especially in the preventive diagnostics of newly designed and printed circuit boards. After assembling and testing the prototypes, a thermal camera is used to detect components and joints with excessive heating. The great advantage of Thermovision is its speed and contactlessness. In the event, that an undesired warming is detected on the prototype, we correct the design and repeat the testing. This ensures that only well-designed devices will be brought into production.