高压施加于被试的两个相互绝缘的部件之间，例如被试设备的主电路与其金属外壳。
High voltage is applied between the two parts across the insulation being tested, such as the primary circuit and metal enclosure of the equipment under test (EUT).
交流耐压试验是交流电气设备最重要的试验项目，是考验被试品绝缘承受交流电压能力的有效方法。
AC Withstand Voltage test is the most important test item to AC electric equipments, is a valid method of trying out the ability of the insulation withstanding AC voltage of tested object.
当设备一项初始试漏测试被原始建造规范允许，这项测试也可以用于核实设备的气密性泄漏的修理结果。
When an initial service leak test is permitted by the original code of construction, such testing may also be used to verify the leak tightness integrity of repair.
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