The Transformer Test System (TTS) is a high-performance, fully automatic transformer tester which integrates a precision magnetic analyzer with a multiple-terminal tester under the control of an external computer. The TTS automates transformer testing to dramatically increase test speed and improve product quality. The system performs the following transformer measurements: inductance, capacitance, RAC and RDC, turns ratio, impedance, leakage, insulation and insulation resistance testing. It tests frequencies from 20 Hz to 1 Mhz. Drives levels up to 10 V ac and bias up to 1 A are also provided. Circuit trimming with programmable offsets provides maximum accuracy. The system operates with up to 30 different test sequences stored for fast retrieval and high-test throughput.