The TH0690 is an advanced intelligent testing instrument developed for the comprehensive performance evaluation of current transformers. It accurately measures key electrical parameters including ratio error (k) and phase displacement () for both I/I and I/V type transformers , ensuring precise performance assessment. In addition to electrical accuracy testing, the TH0690 is capable of analyzing the AC magnetic characteristics of transformer cores . This enables deep insight into the correlation between electrical and magnetic propertiessolving a long-standing challenge in current transformer design validation. The instrument provides a complete, reliable, and high-performance evaluation platform for laboratories, calibration institutions, and transformer manufacturers. Current Range Short-term Stability (%/min) Measurement Uncertainty (k=2, ppm*RD+ppm*RG) Maximum Load Voltage (V) Distortion (%) 2 mA 0.003 20 + 20 1.2 < 0.2 5 mA 0.003 20 + 20 1.2 < 0.2 10 mA 0.003 20 + 20 1.2 < 0.2 20 mA 0.003 20 + 20 1.2 < 0.2 50 mA 0.003 20 + 20 1.2 < 0.2 100 mA 0.003 20 + 20 1.2 < 0.2 200 mA 0.003 20 + 20 1.2 < 0.2 500 mA 0.003 20 + 20 1.2 < 0.2 1 A 0.003 20 + 20 1.2 < 0.2 2 A 0.003 20 + 20 1.2 < 0.2 5 A 0.003 20 + 20 1.2 < 0.2 10 A 0.003 20 + 20 1.2 < 0.2 20 A 0.003 20 + 20 1.2 < 0.2 50 A 0.003 20 + 20 1.2 < 0.2 100 A 0.003 20 + 20 1.2 < 0.2 Key Features Precision testing capability for both I/I and I/V current transformers Measurement of ratio error, phase displacement, and core magnetic characteristics Wide measurement range from 2 mA to 100 A with high stability Extremely low distortion ensuring accurate waveform reproduction High stability performance with 0.003%/min drift Long-term stability with consistent accuracy over 24h, 90 days, and 1 year Designed for transformer R&D, performance verification, and laboratory metrology