The XHJS1000B Dielectric Loss Tester is an upgraded version of XHJS1000A, added with CVT ratio and phase error measurement functions. Adopting variable frequency power supply technology, it realizes automatic frequency conversion, A/D conversion and data calculation via single-chip microcomputer and electronic technology. It outputs pure sine waves of 45Hz and 55Hz, features automatic pressurization, and can provide a voltage up to 10kV.