The MEDAS system is a compact altitude simulator that reproduces a wide range of environmental conditions. It allows for testing light- to heavy-duty vehicles, including Non-Road Mobile Machinery (NRMM). It is ideally suited for a range of testing applications, such as durability, RDE replication, emission tests and mapping as well as tests from component to vehicle level. The patented technology inside the MEDAS system allows dynamic changes on the simulated atmosphere with high accuracy. The system can also be moved between different test cells due to its compact design.