Cervantes, Manuel L.

Raso, Felix

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19TH IMEKO TC-4 Measurements of Electrical Quantities601DC009  Measurement of Frequency Dependences of Low-ValueFour-Terminal Resistance StandardsJaroslav Bohacek1A 10 Ω quadrifilar resistor with calculable frequency depend-ence served as a reference in measurement of frequency de-pendences of resistance standards ranging from 1 Ω to 0.01 Ω in a frequency range up to 10 kHz. In these measurement, a step-down method based on successive 10:1 comparisons of the standards by means of a transformer bridge was used. Ratio arms of this bridge being formed by an eight-decade, two-stage inductive voltage divider, a small variable voltage injected into one connecting lead of the ratio winding of the divider serves for quadrature balancing.Keywords – Current shunt, calculable resistor, transformer bridge. In this paper, the new system developed at CEM for the cali-bration of electric charge meters is presented. Two different approaches are adopted. The first one is based in the charge of a standard capacitor, the other one in the generation of a known current during a specific time. AC-DC differences of RS 1, RS 0.1 and RS 0.01Block scheme of a JTAG BIST for self-testing of analog parts of mixed-signal electronic systems 01 901DC009  Calibration System for Electric Charge at the Centro Español de MetrologíaFélix Raso2, Manuel L. Cervantes201 20Scheme of measuring system.

Calibration system for electric charge at the Centro Español de Metrología

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