The Experts below are selected from a list of 166413 Experts worldwide ranked by ideXlab platform
Nasa - One of the best experts on this subject based on the ideXlab platform.
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Volume-ratio Calibration System for vacuum gages
2019Co-Authors: NasaAbstract:Volume-ratio Calibration System consists of a gas source, high pressure gauge, small volume tank, large volume chamber, plus appropriate piping, valves, and vacuum source. This System used in conjunction with commercial vacuum gauges evaluates its ability to accurately produce desired pressures in the .000001 to .01 torr range.
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Wireless Inclinometer Calibration System
2018Co-Authors: Nasa, Asrc Aerospace Corp.Abstract:A special System was fabricated to properly calibrate the wireless inclinometer, a new device that will measure the Orbiter s hang angle. The wireless inclinometer has a unique design and method of attachment to the Orbiter that will improve the accuracy of the measurements, as well as the safety and ease of the operation. The System properly calibrates the four attached inclinometers, in both the horizontal and vertical axes, without needing to remove any of the component parts. The Wireless Inclinometer Calibration System combines (1) a Calibration fixture that emulates the point of attachment to the Orbiter in both the horizontal and vertical axes and the measurement surfaces, (2) an application-specific software program that accepts Calibration data such as dates, zero functions, or offsets and tables, and (3) a wireless interface module that enables the wireless inclinometer to communicate with a Calibration PC.
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Automatic Calibration System for pressure transducers
2011Co-Authors: NasaAbstract:Fifty-channel automatic pressure transducer Calibration System increases quantity and accuracy for test evaluation Calibration. The pressure transducers are installed in an environmental tests chamber and manifolded to connect them to a pressure balance which is uniform.
Satoshi Tanaka - One of the best experts on this subject based on the ideXlab platform.
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ΔΣ PLL Transmitter With a Loop-Bandwidth Calibration System.
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a PLL transmitter with a linear charge pump and a new loop-bandwidth Calibration System that can calibrate loop bandwidth accurately in a very short time. The Calibration System uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our PLL transmitter for GSM phones, the Calibration System keeps the loop bandwidth within 2% and the Calibration time is about 25 s. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the PLL transmitter with the charge pump and Calibration System was kept within 2 degrees rms, and after Calibration the 400-kHz offset noise level of the spectrum mask was 64 dBc.
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AS PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a AS PLL transmitter with a linear charge pump and a new loop-bandwidth Calibration System that can calibrate loop bandwidth accurately in a very short time. The Calibration System uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our ∇Σ PLL transmitter for GSM phones, the Calibration System keeps the loop bandwidth within 2% and the Calibration time is about 25 μs. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the dE PLL transmitter with the charge pump and Calibration System was kept within 2 degrees rms, and after Calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
Yukinori Akamine - One of the best experts on this subject based on the ideXlab platform.
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$\Delta \Sigma $ PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Takao Okazaki, Masumi Kasahara, Kazuaki Hori, Shigeya TanakaAbstract:We developed a DeltaSigma PLL transmitter with a linear charge pump and a new loop-bandwidth Calibration System that can calibrate loop bandwidth accurately in a very short time. The Calibration System uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our DeltaSigma PLL transmitter for GSM phones, the Calibration System keeps the loop bandwidth within 2% and the Calibration time is about 25 mus. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the DeltaSigma PLL transmitter with the charge pump and Calibration System was kept within 2 degrees rms, and after Calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
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ΔΣ PLL Transmitter With a Loop-Bandwidth Calibration System.
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a PLL transmitter with a linear charge pump and a new loop-bandwidth Calibration System that can calibrate loop bandwidth accurately in a very short time. The Calibration System uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our PLL transmitter for GSM phones, the Calibration System keeps the loop bandwidth within 2% and the Calibration time is about 25 s. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the PLL transmitter with the charge pump and Calibration System was kept within 2 degrees rms, and after Calibration the 400-kHz offset noise level of the spectrum mask was 64 dBc.
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AS PLL Transmitter With a Loop-Bandwidth Calibration System
IEEE Journal of Solid-state Circuits, 2008Co-Authors: Yukinori Akamine, Manabu Kawabe, Kazuyuki Hori, Takao Okazaki, Masumi Kasahara, Satoshi TanakaAbstract:We developed a AS PLL transmitter with a linear charge pump and a new loop-bandwidth Calibration System that can calibrate loop bandwidth accurately in a very short time. The Calibration System uses a double integration technique that integrates the transient signal at the voltage-controlled oscillator output during the response to a step wave input to the divider. In our ∇Σ PLL transmitter for GSM phones, the Calibration System keeps the loop bandwidth within 2% and the Calibration time is about 25 μs. To improve the GSM spectrum, we developed a charge pump that reduces a spike noise and the asymmetry of the charge and discharge characteristics. The phase error of modulation in the dE PLL transmitter with the charge pump and Calibration System was kept within 2 degrees rms, and after Calibration the 400-kHz offset noise level of the spectrum mask was -64 dBc.
Xiao Zhi-gang - One of the best experts on this subject based on the ideXlab platform.
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Research of radiometric Calibration System for spaceborne SAR based on workflow
Computer Engineering and Design, 2008Co-Authors: Xiao Zhi-gangAbstract:On the basis of the development and knowledge of the original radiometric Calibration System for Spaceborne SAR,the domain requirement of radiometric Calibration System for Spaceborne SAR and the data process flow of the radiometric Calibration System is anal-yzed,and the technology of workflow and the mechanism of workflow management System technology are researched.After introducing the technology of workflow into the current radiometric Calibration System,the control logic is separated from the concrete implement logic,and data process automated or semi automated is realized.And the efficiency,flexibility and adaptability of the System are improved.
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Study of the LED Based Light Calibration System for Neutron Wall Detector
High Energy Physics and Nuclear Physics, 2007Co-Authors: Yu Yu-hong, Xiao Zhi-gang, Xu Hua-gen, Zhan Wen-long, Xu Hu-shan, Su Hong, Li Xiao-gang, Sun Zhi-yu, Hu Zheng-guo, Guo ZhongyanAbstract:The light Calibration System is one of the key components of Neutron Wall detector. It is used to calibrate the electronics and to monitor the long-term stability of the detector modules. With the detaile investigations, a Calibration System with high-power LED (3W) driven by the fast pulses has been carried out. It is also tested together with the detector module of the Neutron Wall and the result of the preliminary Calibration demonstrates that it fulfills the needs. It's a new design proposal to the light Calibration System of the fast scintillator detector.
Zhang Neng - One of the best experts on this subject based on the ideXlab platform.
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Research on Multi-transformers Synchronous Calibration System
Water Resources and Power, 2012Co-Authors: Zhang NengAbstract:With the establishment of the provincial measuring center,the quantity of transformer voltage(TV) Calibration greatly increased.This paper introduces a new transformer voltage Calibration System which can calibrate twelve transformer voltage synchronously,analyzes the errors of transformer voltage.The scheme of new System is also introduced.Compare with traditional Calibration System,this System adopts high-end measuring method and simulation load with no need for relay switching circuit and multiple step-up and step-down voltage.The practicability of the scheme is verified by the experiment.
