Calibration Of Gain Ratios On Nv-Meters With The Reference Step Method

The Reference Step Method for calibrators can be modified for calibration also of the gain ratios on a meter. The method has earlier been evaluated in the range 100 mV - 1000 V on DMM HP 3458A1 and shows that an accuracy of typically < 0.2 mu V/V could be obtained. We have investigated the performance of the method when calibrating ratios in the range 1 mV -100 mV on two common nV-meters. In our comparisons with the Josephson Voltage Standard the differences are within +/- 12 mu V/V at the ratio 10mV:1mV and within +/- 1.3 mu V/V at 100mV:10mV.