LEM has extended its range of current transducer families designed to operate from a single +5 V power supply, with the introduction of the HMS model. The new unit measures just 16 x 13,8 x 12 mm and integrates a primary conductor. It is directly surface-mounted onto a printed circuit board to reduce 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 50 kHz, 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 2,5 V reference voltage is provided on a separate pin or can be forced by an external reference (between 1,5 and 2,8 V) 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 ±0,625 V.
A unique LEM ASIC designed for use with open-loop Hall-effect technology has been used to provide performance improvements. These include better offset and gain drifts and linearity, in addition to an extended operating temperature range (-40°C to +85°C) compared to traditional discrete technology. The transducers are CE marked, conform to the EN 50178 standard and are suitable for industrial applications such as home appliances, variable speed drives, UPS, SMPS, power inverters (solar, wind, etc) and airconditioners. The HMS is supplied with a five year warranty, as are all LEM industrial products.
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