900A current transducer from LEM sets new benchmark for accuracy and drift

LEM has introduced its new high accuracy ITL 900 current transducer for precise measurement of DC, AC and pulsed currents up to ±900A. The ITL 900 is the highest accuracy current transducer available on the market today, allowing more precise measurement and control of currents in wide range of industrial, medical and instrumentation applications.

The ITL 900 provides linearity error (εL) of less than or equal to 3ppm over an operating temperature range of +10 to +50ºC, offset stability over four hours of less than 0.5ppm, offset current temperature coefficient (TCIOE) of less than 0.3ppm/ºK .

The new transducer offers a wide measurement bandwidth of more than 200kHz (-3dB), allowing fast current transients to be accurately measured. Other advantages include negligible self-magnetisation, a current overload capability, and galvanic isolation between the high-power primary circuit and the electronic secondary circuit.

The ITL 900 also has very low output noise, with random noise less than 15μAtrms and coherent noise of less than 50μAtrms at 50 or 60Hz.The ITL 900 works on an internal clock that can also be synchronised to an external clock signal, increasing immunity to periodic noise.

The new transducer is based on a double fluxgate closed loop technology that has been adapted and improved by LEM. Conventional transducers, based on open loop (uncompensated) Hall effect technology, cannot provide the extremely low non-linearity error, very low noise floor or low thermal offset drift required in many applications such as high performance gradient amplifiers for magnetic resonance imaging (MRI) or precision current-regulated devices like high accuracy power supplies, test bench power analysis calibration equipment, and laboratory and metrology equipment.

The ITL 900 is CE marked and is supplied with a five-year warranty, as are all LEM industrial products.

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