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AC Current Transducer | Selecting and Using Transducers Series: For the Measurement of Electric, Power, Voltage, and Current

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May 26, 2016

What is an AC current transducer?
AC (alternating current) current transducers provide a direct current (DC) or voltage output directly proportional to the AC input. AC current transducers typically have a transformer input to isolate the transducer from the current input. Following the transformer are the electronics.AC Transducer Circuit

There are two types of AC current transducers

  1. Absolute average measuring, RMS calibrated (or mean value measuring, RMS calibrated).

These inexpensive transducers simply convert the AC input to DC and have the output calibrated to represent the root mean square (RMS) value for sine wave input. This type is very adequate for situations in which the current wave shape is not distorted. Any odd harmonic or discontinuity will introduce large error. Use the true RMS measuring type when distortion of a sine wave is present.

  1. True RMS (root mean square) measuring

These transducers calculate the RMS value of the current input and provide a DC output directly proportional to the effective value of the current input. This type should be used whenever the current is distorted as in Variable Frequency Drives and SCR controlled loads.

Ohio Semitronics, Inc. has a wide range of current transducers available for various situations. Models are available with or without current transformers, with current transformers built in, and with split core current transformers.

3ACT Current TransducerCTC Current TransducerSCT Current Transducer


Interested in reading the entire Selecting and Using Transducers for the Measurement of Electric, Power, Voltage, and Current document? (Click here)


Need more help selecting the best and most accurate power measurement tool for your project? Call Ohio Semitronics, Inc. today, 1-800-537-6732
sales@ohiosemitronics.com