A Test of the Quantum Hall Effect as a Resistance Standard

This paper demonstrates that the quantum Hall effect can be used to monitor a laboratory unit of resistance. A 6453.2-?? room temperature reference resistor was calibrated relative to two quantum Hall effect devices with a 0.017-ppm (1 ??) uncertainty for each 1 h measurement period. This accuracy was achieved by correcting for a measurement system offset error and for the temperature dependences of each quantum Hall device. Hamon series-parallel resistor networks were then used to calibrate the 6453.2-?? resistor in terms of the five one ohm resistors which comprise the NBS ohm. The total l?? accuracy for the transfer between the quantum Hall devices and the 1-?? resistors was 0.047 ppm.