Dissipation Factors of Fused-Silica Capacitors in the Audio Frequency Range

We describe dissipation factor measurements of 10-pF fused-silica capacitance standards from 50 Hz to 20 kHz using a toroidal cross capacitor and a 10-pF nitrogen-filled capacitor as the references. The relative combined standard uncertainties are 0.56 10
^-6
, 0.16 - 10
^-6
, and 0.26 10
^-6
at 100 Hz, 1 kHz, and 10 kHz, respectively