Different test procedures of the Liebherr Test Centre
Stricter mechanical approval standards for electronic equipment require extensive vibration and shock testing. During these processes, the electrical part is mounted on a vibration testing system and shaken at a predefined intensity.
After that, the part can be tested again to see how well it works.
In the HALT process (Highly Accelerated Life Test), products are charged in their development phase beyond their specification limits.
Fluctuating, extreme temperatures of -100 ° C to + 200 ° C, temperature changes of up to 70 ° C per minute and simultaneous 6-axis noise excitation provoke failures, which then help to improve the product.
Salt accelerates the corrosion of metal, which causes electrical parts to stop working normally.
The salt-spray chamber uses salt water to replicate the conditions found, for example, on offshore platforms at sea. To perform this kind of testing, the test chamber is filled with salt water.
The salt water is then converted into a fine spray, which the electrical part is exposed to over a lengthy period.
The part will become encrusted with salt. After that, it is tested again to see if it still works.
At the Liebherr testing lab, it is also possible to conduct various electrical tests. A transient response test, for example, uses a generator to produce a spike in current which the electrical part must be able to withstand.
This is important for control units in engines, for example. During engine start-up, these parts must be able to briefly endure a very high current, much higher than the usual operating current.
Electrical parts are often just small building blocks that make up a larger system. That is why it is important to test a control unit for a climate control system on board an aircraft in combination with other electronics found on board.
This is especially important for safety-related parts, such as this control unit, because it will regulate cabin pressure on board the aircraft, which is essential to the health of every passenger.
Multiple parts can be combined inside the testing lab to simulate the system as a whole.