This paper describes a lowvoltage ACDC transfer traceability technology at 2-500 mV/1 kHz-1 MHz range, it also describes the use of a decimal inductive voltage divider used for the scale expansion of ACDC transfer technology. Thompson method is introduced in the paper and it gives the experimental data of calibration of IVD. This article also describes the design and winding of a calibration IVD with an additional secondary winding. Correction circuit and inputoutput isolation voltage divider, and Ntype connector is designed to further reduce the magnetic error. The calibration system is applied at millivolt voltage and industrial frequencies.