CT PT Analyzer (Transformer Comprehensive Characteristic Tester)| XHTX206 The XHTX206 transformer comprehensive characteristic tester is a new-generation revolutionary CT and PT testing instrument developed on the basis of traditional transformer VA characteristic, ratio and polarity testers that rely on voltage regulators, boosters and current boosters. Adopting a high-performance DSP and FPGA with advanced manufacturing technology, the instrument ensures stable and reliable