Research of transfer quantum hall resistance with direct current comparator bridge instrument

The problems of transfer Quantum Hall resistance to 1 Omega resistance standard with direct current comparator bridge (DCC) are introduced. Some effective technique ways are suggested by analyzing the possible causations of the measurement results´ fluctuation. The comparing experiments between DCC and cryogenic current comparator bridge (CCC) have been performed with analyzing the uncertainty of measurement results. The transfer uncertainty from Quantum Hall resistance to 1 Omega standard with DCC is 3times10^-8 (k=1), which is enough accurate in practical resistance standard calibration of metrology.