What are the requirements of the IEC62301 standby power test standard for power measurement instruments?

What are the requirements of the IEC62301 standby power test standard for power measurement instruments?

A power meter or power analyzer with harmonic measurement and integral measurement function is required;

The power of resolution is better than 0.01W, such as 220V power supply, the current is about 50uA and the requirements of measuring instrument can measure the current so small, basically can reach the level of the power meter precision to reach 0.1% or higher;