This document specifies test methods for the determination of the efficiency of frequency conversion from the electrical input, and of the available and workload microwave output power in industrial microwave heating installations, as well as operational flexibility. This document is in principle applicable to industrial microwave heating equipment and installations in the frequency range from 300 MHz to 300 GHz but focussed on the microwave ISM frequencies below 6 GHz. This document relates to industrial microwave heating equipment operating as intended by the manufacturer s specifications for normal operation. This document does not apply to appliances for household and similar use (covered by IEC 60335-2-25:2019), commercial use (covered by IEC 60335-2-90:2015 and IEC 60335-110:2024) or laboratory use (covered by IEC 161010-2-010:2019).