Voltage linearity evaluation for a high-speed digitizer adopted to a quantum sampling voltmeter

We report the linearity evaluation for a high-speed digitizer NI 5922, which is adopted to a quantum sampling voltmeter. The evaluation has been carried out for three units of the digitizer using a reference voltmeter with a 14-bit arbitrary waveform generator as a dummy voltage source. The three units show totally different behaviors in terms of the voltage linearity which might be described with different polynomial functions of input voltage. In the conference, we will present results of the linearity evaluation for the three units using a programmable Josephson voltage standard.