TY - JOUR
AU - Lyons, Claude L
AB - For precise measurements of small capacities, or for the accurate determination of dielectric losses, as well as for several other purposes, the ordinary form of bridge is rather unsatisfactory, since frequently the stray capacities are of the same order of magnitude as those under measurement. A more satisfactory form of "capacity bridge," incorporating the complete shielding of its elements, is described. The instrument, which is a modified form of Wiens' series resistance bridge, is designed for general use in the radio and electrical laboratory.A survey is given of auxiliary equipment necessary to form an efficient laboratory "set-up" of the instrument, including such items as a cheap and efficient "source" of A.C. of fixed frequency and reasonably satisfactory wave-form. The use, and the schematic circuit of an auxiliary vacuum tube amplifier of the tuned audio-frequency type is shown, the purpose of which is to increase the overall efficiency of the apparatus and to assist in the more accurate determination of the exact balance point of the bridge.The general operations, and formulae for the precise measurement of fixed and variable capacities are given, as well as for the determination of power factor, phase angle, dielectric constant (including change of this constant with variation in temperature) and the ascertainment of small and large resistances and inductances. Whilst the data given refers to the described bridge in particular, the methods may very easily be applied in regard to series resistance bridges in general, as well as to some other forms.
TI - Laboratory measurement of capacity, power factor, dielectric constant, inductance and resistance, by use of the series resistance bridge
JF - Journal of Scientific Instruments
DO - 10.1088/0950-7671/5/5/303
DA - 1928-05-01
UR - https://www.deepdyve.com/lp/iop-publishing/laboratory-measurement-of-capacity-power-factor-dielectric-constant-GF4zIf0XMw
SP - 155
VL - 5
IS - 5
DP - DeepDyve
ER -