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For high precision impedance measurement only a very limited range of commercial instruments is available. The most accurate commercially available instruments for impedance measurements are capacitance bridges. Precise instruments for inductance or general impedance measurements are not available on the market. This paper describes novel methods for calibration of inductance reference standards from...
The impedance characteristics of resistance, capacitance and inductance can be simulated to calibrate Impedance Bridge by means of setting the amplitude ratio of voltage to current. In this paper we analyze the principles of voltage controlled and current controlled simulation impedance. The experiment and data are given. We propose the new concept of Digital Simulation Impedance (DSI) which is simulated...
A four-terminal co-axial pair Maxwell-Wein bridge has been developed at NRC. The bridge is suitable for the determination of self-inductance in terms of resistance and capacitance in the frequency range of 800 Hz to 5 kHz. The bridge is primarily designed to measure the four-terminal definition of the impedance of a self-inductor but may be easily modified to measure one-terminal pair impedance using...
This paper describes a measurement set up based on a synchronous sampling system which allows the realization of the henry directly from the ohm and the second. This new set up improved the realization of the henry at METAS by a factor of 5. For the calibration of a 100 mH inductance standard at a frequency of 1 kHz, the expanded uncertainty amounts now to 15 muH/H.
To validate an inductance resonance bridge, which is based on a commercial capacitance bridge, a second resonance bridge was built, based on a self-composed 4 terminal-pair impedance ratio bridge. From analysis of the results on 100 mH standards at 1 kHz, discrepancies have been resolved and the uncertainty has been improved to 26 muH/H.
This paper describes the realization of auto source balance in a modified Maxwell-Wien bridge by using a differential amplifier. The method of eliminating the oscillation of this differential amplifier is also discussed. The inductance measurement error introduced by the adoption of differential amplifier and related compensation circuit has also been analyzed in details. In the range of 100 muH~100...
This paper describes how to calibrate the right angle phase of a Four-Terminal-Pair (4TP) LCR meter. The meter uses the right angle signal to process synchronous detector as a vector receiver. The right angle calibration method uses, at least, one programmable phase signal generator and a phase shift circuits. The signal generator and the phase shifter do not require a precision 90 degree angle. As...
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