Test method:

1. This experiment is generally conducted during the rated working low temperature test and rated working high temperature test;

2. During the experiment, connect the power cord of the equipment to an adjustable power source. Maintain the output frequency of the adjustable power supply at ± 2% of the product's rated frequency, place the voltage at+110% or 90% of the product's rated voltage, whichever is unfavorable, and maintain it at that voltage for at least 5 minutes before testing the relevant testing items specified in the product standard.

Adaptability to power supply:

1. For equipment powered by the power grid, the test voltage is 110% or 90% of the rated value.

2. For equipment with special requirements for power frequency and voltage, the operating range and testing methods for frequency and voltage can be separately specified in the product standards.