= Hall-plateau voltmeter calibration
{c}
{title2=$\lambda=IR_K/(pD_p)$}
For an integer <quantum Hall effect> plateau with index $p$ carrying a known current $I$, the true transverse voltage is $IR_K/p$. If an offset-corrected instrument displays $D_p$, its gain in volts per displayed unit is $\lambda=IR_K/(pD_p)$. Independent current and displayed-height errors add in relative quadrature. The Hall-bar width cancels; it enters an electric-field calibration instead. A missing plateau height or an unidentified absolute plateau index prevents a unique numerical gain.
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