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During the thermal shock test, ThinkPad devices and chargers are subject to cold and heat tests ranging from -20 degrees Celsius to 60 degrees Celsius for a few days.
This is to simulate airplane cabin temperature which may drop below zero degrees Celsius because of high altitudes, and ship cargo temperature which may go up to 50 to 60 degrees Celcius.
In the anechoic chamber, researchers measure noise coming from the laptop. While most of the noise comes from the fan or hard disk, the AC adapter and electrical ports are prone to produce noise too.
This test makes sure laptops produce as little noise as possible so users can use their devices in quiet environments such as the library without disturbing others.
In the EMI (electro-magnetic interference) chamber, Lenovo measures the electrical field strength of ThinkPad devices to ensure they comply with international standards.