This paper analyzes the status of dielectric loss tester and introduces the principles 、 characters 、 test miring and application example of Intelligent AI-6000 ( C) HV Frequency Conversion Dielectric Loss Tester in detail. 分析介质损耗测试仪的现状,阐述了AI-6000(C型)高压智能变频介质损耗测试仪的原理、特点、测试接线及应用实例。