Capacitance Standards

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standard (electrical) capacitors, characterized by highly stable nominal capacitance (constant calibration). Such standards are used mainly for accurate measurements conducted with capacitance meters and q-meters. Capacitance standards are divided into two groups: (1) constant capacitance of 0.5 pF (picofarad) to 0.1μF and (2) variable capacitance of up to 0.002 μF. The dielectric in the standards is usually a high-grade mica, a ceramic with low dielectric losses, and air. The temperature coefficient is usually 10^-5-10^-6 deg^-1 and the loss tangent is tan δ = 10^-3-10^-4. Measures of capacitance are carefully shielded during accurate measurement in order to reduce any capacitive coupling with surrounding objects.

REFERENCE

Valitov, R. A., and V. N. Sretenskii. Radiotekhnicheskie izmereniia. Moscow, 1970.

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No references found			NIST plans to transfer the frequency dependence data to the Farad Bank and other reference capacitance standards, so that in the near future, improved capacitance calibrations will be available from NIST for the entire audio frequency range. NIST establishes reference for measuring frequency dependence of ... by Journal of Research of the National Institute of Standards and Technology This compares favorably with the total relative uncertainty of 4X 10 (-8), which is achieved for the highly optimized comparisons against the calculable capacitor that are performed as part of the regular maintenance of NIST's primary bank of capacitance standards. Nist researchers complete uncertainty analysis for linking ECCS to SI ... by Journal of Research of the National Institute of Standards and Technology Recent work at NIST has resulted in a factor of three decrease in the uncertainty for certain of the highest-level calibrations of fused-silica capacitance standards. NIST reduces uncertainty for NIST capacitance calibrations by Journal of Research of the National Institute of Standards and Technology			cap-binding protein Cap-Haitien Cap-Haïtien Capa Capa, Robert Capabilities Maturity Model capability capability list Capability Maturity Model Capablanca Capablanca, Jose Raul Capablanca, José Raúl Capac Raymi Capacitance capacitance alarm capacitance altimeter capacitance box capacitance bridge capacitance hat capacitance level indicator Capacitance measurement Capacitance Meter capacitance probe capacitance relay capacitance standard Capacitance Standards capacitance-operated intrusion detector Capacitance-Type Sensor capacitation capacitive coupling capacitive diaphragm capacitive divider capacitive electrometer capacitive feedback capacitive load capacitive loading capacitive post capacitive pressure transducer Capacitive Reactance capacitive tuning capacitive window capacitive-discharge ignition capacitive-discharge pilot light Capacitor capacitor antenna capacitor bank capacitor box capacitor color code capacitor hydrophone capacitor loudspeaker capacitor microphone			Capacify capacious capacious capaciously capaciously capaciousness capaciousness Capacita di finanziamento in titoli capacitance capacitance capacitance capacitance capacitance capacitance alarm capacitance altimeter capacitance box capacitance bridge Capacitance Diaphragm Gauge Capacitance Driven Layout Capacitance Electronic Disc Capacitance Electronic Disc Capacitance Electronic Disc capacitance hat capacitance level indicator Capacitance measurement Capacitance meter Capacitance Power Dissipation Capacitance probe capacitance relay capacitance standard Capacitance Standards capacitance unit capacitance vessels Capacitance-Equivalent Thickness capacitance-operated intrusion detector Capacitance-Type Sensor Capacitance-Voltage capacitances capacitances capacitances capacitate capacitate capacitate capacitated Capacitated Facility Location Capacitated Material Requirements Planning Capacitated Minimal Spanning Tree Capacitated Minimal Spanning Tree Problem Capacitated Minimum Spanning Tree Capacitated Multiple Allocation Hub Location Problem Capacitated Plant Location Problem Capacitated Vehicle Routing Problem Capacitated Warehouse Location Problem capacitates capacitating capacitation capacitation capacitation capacitations capacitative capacitative

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