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DC voltage measurement device is the key equipment in the DC transmission system, which is mainly used for system voltage measurement and providing voltage signals to the measuring instruments and secondary protection devices. With the rapid development of DC transmission and flexible transmission in China, DC voltage measurement device has been widely used and developed. High accuracy and high stability...
Previous studies for measuring the high direct voltage focused on the resistive voltage divider or the hall voltage sensor. The cost of the hall voltage sensor is expensive and additional shielding method must be taken into account when using the voltage divider. In this paper, resistive voltage divider, integrated operational amplifiers and photocouplers are used cooperatively to design the 1kV DC...
Hamon transfers allow accurate comparison of resistance value of standards in 1:10 and 1:100 ratios. In the paper idea of construction design and development of the Hamon transfers, used for resistance unit transfer from the primary standard QHR (Quantum Hall Resistance) to high value resistance standards up to 100 TΩ, in which factors influencing transfers uncertainty were minimized, has been shown.
The electrical determination of power losses by measuring the input and output power can reach sufficient accuracy for DC-DC converter systems, if well calibrated voltage meters and shunt resistors are applied. However, it is difficult to determine the power in AC-systems, especially with harmonics, due to phase-errors in the electric measurement. In addition, the electromagnetic interference (EMI)...
Temperature is the main factor that influences the output characters of fiber optic gyroscope (FOG), and high accuracy FOG is special the same. In order to reduce the influence of gyro accuracy, a small temperature control system is designed in the paper. In the system, platinum resistor is used as measuring element, semiconductor refrigerator is used as new temperature control element, realizing...
Main reasons why nonlinear errors exist in the process of temperature measurements with platinum resistors have been analyzed in accordance with the nonlinear characteristic of platinum resistors. Then, the principle of two nonlinear compensation algorithms, such as Genetic algorithm, Newton iteration method is introduced. At last, measuring data based on single-chip computer temperature measurement...
A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz...
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