Current Transducers monitor automotive batteries.

Press Release Summary:

Designed to measure dc, ac, or pulsed current from ±40 to ±100 A, HAB 60-S transducers provide PWM output signal proportional to primary current being measured and operate from unipolar 5 V supply. They use open-loop, Hall-effect technology that helps simplify installation and servicing by eliminating need to cut primary cable carrying measured current. Electric offset error is 0.075 A across temperature range from -10 to +65° C and 0.15 A across full range from -40 to +125°C.

Original Press Release:

Automotive Battery Monitoring Transducers from LEM Offer Improved Resolution and Offset Errors

Key points:

o Dedicated ASIC improves resolution and halves offset and gain errors
o Primary current measuring range from ±40A to ±100A
o Accurate measurements without breaking the battery power bus
o PWM output

GENEVA, Switzerland and MILWAUKEE, WI (May 27, 2008) − LEM S.A., the world's leading manufacturer of isolated current and voltage measurement components, has introduced the HAB 60-S family of current transducers for automotive battery-monitoring applications. These transducers have been designed to measure DC, AC, or pulsed currents up to ±100A. A new Application Specific Integrated Circuit (ASIC) incorporated into the units offers resolution 2.5 times better than previous models and a two-fold improvement in offset error, coupled with a significant reduction in price.

The transducers use open-loop, Hall-effect technology that simplifies both installation and servicing by removing the need to cut the [primary] cable carrying the measured current. They provide a pulse-width modulated (PWM) output signal proportional to the primary current being measured and operate from a unipolar 5V supply. Temperature measurement capability can be integrated with the addition of a fourth connection pin to the transducer package.

Output resolution of the HAB 60-S transducer is 0.03A with a linearity of 0.2%. Electric offset error is typically 0.075A across the temperature range from -10° to +65° C, and 0.15 A across the full range from -40° to +125° C.

A water-tight housing and sealed connector provide full environmental protection in engine-compartment applications.

Principal applications are expected to be in the measurement of battery-pack currents in electric, hybrid, and conventional vehicles. The transducers are fully certified to automotive standards.

For further information please contact:

Suzanne Hochheimer
Corporate Communications Manager
Tel.: +41 22 706 1257

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