Nikkohm Co.

Misawa, Japan

Nikkohm Co.

Misawa, Japan

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News Article | November 9, 2016
Site: www.marketwired.com

Atlanta-based electronics distributor, World Micro, Inc., is proud to announce that Nikkohm has released its new metal clad wire wound resistor series (MBH3000, MBH5000, MBH7200, MBH10800). The product offering is immediately available. The MBH series is efficient in conversion of energy up to 200kJoule in a short time period. MBH10800 series is a small sized braking resistor which is flexible / easy to install into the nacelle of wind power generation equipment. The braking resistor has two-form factor implementations, MBH (horizontal mount) and MBV (vertical mount). The MBH10800 is 760mm x 270mm x 72mm (H) and weighs 14kG. MBH contains one, two or three resistor elements in a metal housing. The MBH10800 provides 1 Ω to 240 Ω resistance range, 1500VAC insulation voltage, 2900W continuous power rating, 46kW - 6 second maximum pulse power loading capability (276,000 Joule), and operating temperature range of -55°C to +200°C. The MBH / MBV can be ordered with one of two standard termination types. Both the L shaped metal tab terminals with M5 tapped hole or the standard UL3515-AWG10 insulated wire terminals are available. Terminal box and thermo switch options are available. Initial production capacity is approximately 20,000 pieces / month. Nikkohm Co., Ltd. (CEO Shigeru Hidaka, Ph, D) is a Japanese manufacturer of automotive and industrial resistors, located in Misawa, Aomori. Established in 1966, Nikkohm provides power resistors, wire wound resistors, current detect resistors, precision resistors, microwave resistive components, both thick and thin film thermal converters and metal resistor technology. Nikkohm products applied in the power electronics industry contribute to energy savings and assist in producing a clean electromagnetic environment. This is Nikkohm's social responsibility -- contribute to a clean environment. Nikkohm Co., Ltd. was the first in the world to offer the TO220 style power film resistor in 1986. Both companies will be exhibiting at electronica in Munich, Germany during November, 2016. About World Micro: World Micro, Inc. is a global, aerospace, military, commercial, and medical electronic component and products distributor focused on quality systems. Since 1996, World Micro has helped its customers solve difficult supply chain issues through innovative research, design, sourcing, stocking, procurement, inventory, and management solutions. World Micro, Inc. is privately held with headquarters in Atlanta, Georgia, with its Asian distribution hub in Penang, Malaysia. The company's website is www.worldmicro.com and can be followed on Twitter at twitter.com/worldmicro. Please download a datasheet, http://www.nikkohm.com/ Request sample and quotation at info@worldmicro.com


Sasaki H.,Japan National Institute of Advanced Industrial Science and Technology | Yamamori H.,Japan National Institute of Advanced Industrial Science and Technology | Yamada T.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
IEEE Transactions on Instrumentation and Measurement | Year: 2010

We are developing a programmable Josephson voltage standard (PJVS) system based on a compact cryocooler. The system is capable of generating two arbitrary waveforms by use of a dual-output PJVS (DO-PJVS) device. Owing to this dual-output feature of the PJVS system, the low-frequency characteristic in the acdc transfer difference of a thermal converter has been investigated using the 90° addition method. The evaluation of the low-frequency characteristic of a thermal converter is of great importance for connecting conventional acdc transfer standards and new Josephson-based ac voltage standards. To fulfill this purpose, a dual-heater thermal voltage converter (DH-TVC) with improved low-frequency performance has been developed. The low-frequency acdc transfer difference of the DH-TVC was evaluated to be smaller than 1 μV/V at frequencies of as low as 1 Hz. © 2010 IEEE.


Sasaki H.,Japan National Institute of Advanced Industrial Science and Technology | Kasai N.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Nikkohm Co. | Hidaka S.,Nikkohm Co.
IEEJ Transactions on Electrical and Electronic Engineering | Year: 2011

A thermal-voltage converter for high-frequency (HF-TVC) AC-DC transfer standard has been developed. The HF-TVC was designed such that the frequency characteristic is calculable from the shape and dimension of the input circuit. A new multi-junction thermal converter element (JSTC04) has been developed, which has a simple and straight heater configuration to minimize the parasitic impedances in the input circuit. The AC-DC difference of the HF-TVC was evaluated by two independent methods, with agreement better than 7 μV/V up to 1 MHz. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.


Amagai Y.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Nikkohm Co. | Hidaka S.,Nikkohm Co.
IEEJ Transactions on Fundamentals and Materials | Year: 2012

We have developed a high-performance thin-film multijunction thermal converter (TMJTC) with improved stability, and evaluated its frequency property, long-term stability, and environmental property using high-precision AC-DC transfer difference comparator system. We have fabricated a TMJTC with improved deposit pattern of a Bi-Sb-Cu based thin-film thermopile to avoid interface delamination between Bi and Cu layers. Our TMJTC shows good frequency property, which is less than 5 μV/V in the range from 10 Hz to 100 kHz at the root mean squared (rms) voltage of 10 V. The long-term stability has been significantly increased due to our thin-film thermopile compared with that of previously fabricated TMJTC, which is less than 2 μV/V for 18 months at room temperature. We have also evaluated the temperature, relative humidity, and pressure property based on the International Electrotechnical Commission (IEC) standards for electronic devices. The measurement results have shown that the dependence of the AC-DC transfer difference on the temperature, humidity, and the pressure is less than 1 μV/V, which can be comparable to those of thermal converters as the primary standard. © 2012 The Institute of Electrical Engineers of Japan.


Amagai Y.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Nikkohm Co. | Kishino K.,Nikkohm Co. | Hidaka S.,Nikkohm Co.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

We have evaluated the AC-DC transfer differences of our thin-film multijunction thermal converters with increased heat capacity under vacuum conditions to improve the low frequency characteristics. The measured thermal time constant at about 0.001 Pa is increased up to 9 s from 3 s measured at ambient pressure. The AC-DC transfer differences evaluated by using a sampling method are less than 1 μV/V down to 10 Hz, and 10 μV/V down to 0.2 Hz, which is about ten times smaller compared with those obtained at ambient pressure. © 2014 IEEE.


Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Amagai Y.,Japan National Institute of Advanced Industrial Science and Technology | Sasaki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,NIKKOHM Co. | And 2 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

This paper describes the improved performance of thin film multijunction thermal converters (TFMJTC) that has been developed by NMIJ and NIKKOHM Co. Ltd. For the former type TFMJTCs, a deterioration of thermocouples was observed. The degradation prevention has been completed by changing the design and fabrication process of the thin-film thermopile to improve the durability of the TFMJTCs. Long-term use of the improved TFMJTCs (e.g., more than 20 years) can be expected based on the Arrhenius model. The ac-dc transfer differences from 10 Hz to 1 MHz can be reduced to less than 10 μV/V by adjusting the input impedance. © 2014 IEEE.


Amagai Y.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Nikkohm Co. | Kishino K.,Nikkohm Co. | Hidaka S.,Nikkohm Co.
IEEE Transactions on Instrumentation and Measurement | Year: 2015

We have improved the ac-dc transfer differences and enhanced the sensitivity in our thin-film multijunction thermal converters (TFMJTCs) in vacuum. The ac-dc transfer differences of the TFMJTCs are less than 1 μV/V down to 1 Hz and 10 μV/V down to 0.2 Hz owing to the increased thermal time constant. The measured output voltage exceeds 120 mV at 10-4 Pa owing to the reduction of heat conduction to the air. The sensitivity of the device, defined as the ratio of the output voltage to the input power, is 2.4 V/W, which is approximately three times larger than that measured at ambient pressure. Numerical simulations of the heat transfer of our TFMJTC explain the experimental results well. © 1963-2012 IEEE.


Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Amagai Y.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Nikkohm Co. | Kishino K.,Nikkohm Co. | Hidaka S.,Nikkohm Co.
IEEE Transactions on Instrumentation and Measurement | Year: 2015

To increase the long-term stability of thin-film multijunction thermal converters (TFMJTCs) developed by the National Metrology Institute of Japan and Nikkohm Corporation Ltd., we prevented their degradation by improving the design and fabrication process. Judging from the Arrhenius model experiments, we successfully increased the lifetime of a renewed TFMJTC to more than 20 years by improving the deposition pattern of a Bi-Sb-Cu-based thin-film thermopile. We also evaluated the thermoelectric effect of the renewed TFMJTCs by the fast-reversed dc method. The low thermoelectric effect of less than 0.1 μV/V has been realized, which is comparable with that of high-quality multijunction thermal converters previously produced by other national metrology institutes. © 1963-2012 IEEE.


Hidaka S.,Nikkohm Co. | Kishino K.,Nikkohm Co. | Shimizume K.,Nikkohm Co. | Takeda S.,Nikkohm Co. | And 3 more authors.
IEEJ Transactions on Electrical and Electronic Engineering | Year: 2013

A new multijunction thermal converter (MJTC) for precision AC-DC transfer standard has been developed. A U-shaped heater pattern was sputter-deposited onto an AlN plate in order to reduce thermoelectric effect, which causes the frequency-independent AC-DC transfer difference. Both low-frequency and high-frequency characteristics improved as a result of the new configuration, and the AC-DC transfer difference of the MJTC was evaluated to be <1 μV/V between 10 Hz and 100 kHz and <10 μV/V up to 1 MHz. © 2012 Institute of Electrical Engineers of Japan.


Amaga Y.,Japan National Institute of Advanced Industrial Science and Technology | Fujiki H.,Japan National Institute of Advanced Industrial Science and Technology | Shimizume K.,Japan National Institute of Advanced Industrial Science and Technology | Hidaka S.,Nikkohm Co.
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2014

We have demonstrated the long-term stability and environmental durability of a high-performance thin-film multijunction thermal converter (TMJTC) with an improved thin-film thermopile design. We fabricated a new TMJTC with an improved deposition pattern for a Bi-Sb-Cu-based thin-film thermopile in order to avoid interface delamination between the Bi and the Cu layers. Our TMJTC exhibited good frequency properties, with an ac-dc difference of less than 5 μV/V in the range from 10 Hz to 100 kHz, at a root-mean-square (rms) voltage of 10 V. The long-term stability of the TMJTC has been significantly increased owing to the performance of the developed thin-film thermopile, as compared with that of previously fabricated TMJTCs, exhibiting an ac-dc difference of less than 2 μV/V after 18 months at room temperature. We also evaluated the temperature, relative humidity, and pressure characteristics of the TMJTC in accordance with the International Electrotechnical Commission (IEC) standards for electronic devices. The measurement results showed that the dependence of the ac-dc transfer difference on the temperature, humidity, and pressure was less than 1 μV/V, which is comparable to the results of thermal converters, constituting the primary standard. © 2014 Wiley Periodicals, Inc.

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