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This paper describes the calibration of a high voltage resistor divider, using a comparison method. A capacitive and electronic divider or a standard instrument voltage transformer serves as a standard. The difference is evaluated either by means of a special system or by means of a lock-in amplifier.
We investigate the causes of the observed normal mode offsets in precision DMM's. With a circuit simulation tool to model the front-end amplifier we have been able to qualitatively reproduce the observed offset in a commonly used 8.5 digit precision DMM. In general the cause of the offset is related to the symmetry of the front-end architecture. However it seems there are several mechanisms which...
This paper describes the implementation of a new quantum-based system for the generation of 120 V, 5 A, sinusoidal active and reactive power over the 50 Hz to 400 Hz frequency range. The system accurately relates the spectral amplitudes and phases of the voltage and current waveforms of the generated power to a programmable Josephson voltage standard (PJVS) using a novel differential sampling technique...
New mV-amplifiers driving a planar multijunction thermal converter (PMJTC) at their output have been developed to measure the output voltage of micropotentiometers (mupots). Using a twin-stage design with gains of 10, 20 and 30 per stage, total gain factors from 10 to 900 are achieved. This results in a usable range of input voltages from 100 muV up to 100 mV at frequencies from dc to 1 MHz. A novel...
A brief summary is presented for the uncertainty analysis for measurements of noise parameters of amplifiers and transistors, in both connectorized (coaxial) and on-wafer environments. We treat both the X-parameters, which are based on the wave representation of the noise correlation matrix, and the traditional IEEE noise parameters.
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