Alpha Electronics Corporation

Tokyo, Japan

Alpha Electronics Corporation

Tokyo, Japan
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Kaneko N.-H.,Japan National Institute of Advanced Industrial Science and Technology | Oe T.,Japan National Institute of Advanced Industrial Science and Technology | Abe T.,Japan Electrical Meters Inspection Corporation | Kumagai M.,Alpha Electronics Corporation | Zama M.,Japan National Institute of Advanced Industrial Science and Technology
IEEE Transactions on Instrumentation and Measurement | Year: 2017

Compact superstable standard resistors ranging from 1 Ω to 10 kΩ have been under development, and the 4-year evaluation of 1 Ω and 10 Ω resistors is presented in this paper. The typical drift rates of these resistors are around 0.05 μΩ/(Ω year). The temperature coefficients have also been evaluated. The performance of these resistors meets the calibration laboratory conditions for the maintenance of resistance standards. This type of resistor is also stable during transportation and can be used for international comparisons. © 2016 IEEE.


Domae A.,Japan National Institute of Advanced Industrial Science and Technology | Abe T.,Japan Electrical Meters Inspection Corporation | Kumagai M.,Alpha Electronics Corporation | Zama M.,Alpha Electronics Corporation | And 2 more authors.
IEEE Transactions on Instrumentation and Measurement | Year: 2015

Prototype models of a high-stability metal-foil resistor of 1 kΩ with a four-terminal-pair design were developed, and the key characteristics were evaluated. Two types of metal-foil resistors were fabricated: serial number (s/n) 1 is made from two resistor devices of 500 Ω and s/n 2 is made from three resistor devices of 333 Ω. To develop these resistor devices, a new resistor-device design was introduced. The s/n 1 resistor has the following key characteristics: drift rate: 0.010 (μΩ/Ω)/year, first-order temperature coefficient at 23°C: -0.165 (μΩ/Ω)/°C, frequency dependence of the resistance (relative change in resistance normalized at 1 kHz): ±0.21 μΩ/Ω in the frequency range from 400 Hz to 2 kHz, and time constant: -0.46 ns. The s/n 2 resistor has the following key characteristics: drift rate: -0.092 (μΩ/Ω)/year, first-order temperature coefficient at 23°C: 0.096 (μΩ/Ω)/°C, frequency dependence of the resistance (relative change in resistance normalized at 1 kHz): ±0.54 μΩ/Ω in the frequency range from 400 Hz to 2 kHz, and time constant: 0.12 ns. © 1963-2012 IEEE.


Domae A.,Japan National Institute of Advanced Industrial Science and Technology | Kumagai M.,Alpha Electronics Corporation | Zama M.,Alpha Electronics Corporation | Abe T.,Japan Electrical Meters Inspection Corporation JEMIC | And 2 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

We developed a trial model of a 1-kμ metal-foil resistor with a four-terminal-pair design. The resistance and phase angle of the resistor as a function of frequency were measured. Below a 2-kHz frequency, a slight quadratic change in the resistance was observed. The phase-angle results showed a linear change, and the time constant was estimated from the slope of the linear change. © 2014 IEEE.


Domae A.,Japan National Institute of Advanced Industrial Science and Technology | Domae A.,Tokyo City University | Oe T.,Japan National Institute of Advanced Industrial Science and Technology | Kumagai M.,Alpha Electronics Corporation | And 2 more authors.
IEEE Transactions on Instrumentation and Measurement | Year: 2013

Aiming to produce devices for use in high-precision measurements (e.g., as a working standard for calibration work in National Meteorology Institutes), we develop standard resistors with a four-terminal-pair design using high-stability 100-Ω metal-foil resistor components. The current and frequency dependence of the resistance and phase angle have been characterized. Below a current of 5 mA, no current dependence is found within the uncertainty range, and no frequency dependence within the expanded measurement uncertainty range of around 2.5 μOmega;/Ω is found below a frequency of 2 kHz. From the phase-angle measurement results, the time constant of the resistor is estimated to be less than 3.7 ns. © 2013 IEEE.


Sakamoto Y.,Japan National Institute of Advanced Industrial Science and Technology | Kaneko N.-H.,Japan National Institute of Advanced Industrial Science and Technology | Oe T.,Japan National Institute of Advanced Industrial Science and Technology | Kumagai M.,Alpha Electronics Corporation | Zama M.,Alpha Electronics Corporation
IEEE Transactions on Instrumentation and Measurement | Year: 2011

Compact 100-Ω metal foil dc resistors with four terminals have been developed (dimensions of 56 mm × 56 mm × 77 mm; mass of 130 g). Twelve units were characterized at a current of 1 mA over a period of one year, and the fluctuations in resistance were found to be sufficiently small to allow their use at national metrology institutes. The developed resistors have the following main characteristics: drift rate < 0.1 (μΩ/Ω)/year, temperature coefficient < 0.15 (μΩ/Ω)/°C at 23 °C, change in resistance due to relative humidity variation < 0.01 (μΩ/Ω) in the 35%-80% range, and change in resistance due to pressure variation < 0.025(μΩ/Ω) in the 700-1200 hPa range. © 2006 IEEE.


Sakamoto Y.,Japan National Institute of Advanced Industrial Science and Technology | Kaneko N.,Japan National Institute of Advanced Industrial Science and Technology | Oe T.,Japan National Institute of Advanced Industrial Science and Technology | Kumagai M.,Alpha Electronics Corporation | Zama M.,Alpha Electronics Corporation
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2010

Compact 100 Ω metal foil four terminal DC resistor has been developed (W56 x D56 x H77 mm 3; 128 g). Twelve units were characterized and resistance variation was found to be small to suit use in national metrology institutes ( < 0.1 (μΩ/Ω)/year; < 0.15 (μΩ/ Ω)/K at 23 °C; and < 0.01 μΩ/Ω in the humidity range from 35 %RH to 80 %RH). © 2010 IEEE.


Domae A.,Japan National Institute of Advanced Industrial Science and Technology | Kumagai M.,Alpha Electronics Corporation | Zama M.,Alpha Electronics Corporation | Oe T.,Japan National Institute of Advanced Industrial Science and Technology | Kaneko N.-H.,Japan National Institute of Advanced Industrial Science and Technology
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2012

We developed 100-Ω metal-foil resistors with a four-terminal-pair design. The resistance and phase angle of the resistors were measured as a function of frequency. Below a frequency of 2 kHz, a frequency dependence of the resistance was not recognized within the range of the uncertainties. From the phase-angle results, the time constant of the resistor was estimated to be 3.7 ns. © 2012 IEEE.

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