9. Recommendations for use of current transducers
When measuring current with a measurement shunt, care must be taken to reduce the surface area of the current measurement loop to avoid including parasitic inductance. If the resistor is placed far away, a twisted pair reduces the influence of connection inductance and surrounding stray fields. Common-mode current problems can be reduced by using an isolation amplifier (type AD 210 from Analog Device, for example).
Several manufacturers market current transducers based on the measurement of a magnetic field by an induction sensor. They use a flux compensation or open-loop principle for industrial applications: LEM, Honeywell, Allegro, Bell... They are very simple to use. They require a symmetrical or asymmetrical power supply. Output is either current or voltage. In the case of current output, this value is the image of the primary current multiplied by the ratio...
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Recommendations for use of current transducers
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References
- (1) - - Les capteurs de courant de marque LEM : http://www.lem.com/
- (2) - - Capteur d'induction et de courant de marque Honeywell :
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