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Nishi-Tokyo-shi, Japan

Trademark
Alpha Electronics Corporation | Date: 1979-08-24

Electronic Distance Measuring Devices-Namely, Electronic Distance Meters.


Ae

Trademark
Alpha Electronics Corporation | Date: 2002-04-22

Electrical devices, namely, temperature stable resistors and temperature sensors.


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. Source


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. Source


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. Source

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