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Current transducer has four measurement ranges

Posted: 29 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:current transducer? current sensor? HMS model? AC/DC measurement?

LEM S.A. has expanded its current transducer family with the addition of the HMS model that operates from a single 5V power supply. The surface-mount HMS unit measures 0.630-by-0.531-by-0.472-inches (16-by-13.5-by-12mm) and integrates a primary conductor. It is directly surface-mounted onto a PCB, which reduces manufacturing costs.

Four standard models are available to cover nominal AC, DC, pulsed and mixed isolated current measurement of 5, 10, 15 or 20 ARMS, up to 50kHz, with a measuring span of up to 3 x IPN. The same mechanical design is used for all four models so that they can be used to measure current across a complete range of end products.

The internal reference voltage (2.5V) is provided on a separate pin or can be forced by an external reference (between 2V and 2.8V) for reference thermal drift cancellation. Gain and offset are fixed and set so that, at Ipn, the output voltage is equal to Ref in or Ref out 0.625V. A unique LEM ASIC designed for use with open-loop Hall-effect technology has been used to provide performance improvements, said LEM. These include better offset and gain drifts and linearity, in addition to an extended operating temperature range (-40C to 85C) compared to traditional discrete technology.

The transducers are CE marked, conform to the EN 50178 standard and are recognized for industrial applications such as home appliances, variable speed drives, UPS, SMPS, power inverters (solar, wind, etc) and air conditioners. The HMS is supplied with a five-year warranty.

A HMS transducer version for PCB mounting through holes is under development.

- Gina Roos

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