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Electrical Voltage Measurements AC Voltage Transducers-True RMS
Discontinuous (non-sinusoidal) voltage such as those generated by a phase angle fired SCR and zero crossing controllers and pulse wave modulation (PWM) technologies typically require measurements to be taken with a true RMS-measuring transducer.
A true RMS transducer typically samples the incoming voltage at a frequency much higher than the line frequency. Each sample is squared. The number of samples are summed then divided by the number of samples. The square root of that result is taken as the root mean square value. Typical OSI voltage transducers that employ RMS measuring circuitry include the following models:
Three phase, UL-listed. Input frequency range is 48-420 Hz.
Typical Applications
Designed for applications where the measurement of non sinusoidal waveforms is required. May also be used to monitor three single phase circuits where panel mounting space is limited. Common applications include:
Noisy line voltage monitoring
Synthesized voltage waveforms from inverted and SCR controllers
Input Range
Std.Outputs
Accuracy
0-600Vac
See spec sheet for individual model numbers and complete product specifications
0-1mAdc
4-20mA
0-10Vdc
0-5Vdc
±0.25% FS @ 60Hz, and ±0.5% over the specified frequency range.
Output is electrically isolated from the input and is directly proportional to the input. Unidirectional signals only.
Typical Applications
Monitoring of substations or electric circuit performance, isolation and amplification of shunt output. Many VTU’s are deployed in electric generator and solar field monitoring.
Input Range
Std.Outputs
Accuracy
0-1000Vdc
See spec sheet for individual model numbers and complete product specifications
VT7 series voltage transducer produces and output which is directly proportional to input from DC to 10kHz.
VT8 series voltage transducer provides a DC output directly related to the true RMS value of the input over the DC to 10kHz frequency range. Special ranges available upon request.
Typical Applications
Can function as a millivolt DC shunt or a high voltage isolator. Input/output dielectric test of 2500Vac. Applications include:
DC isolation from current shunts
Heating element control in furnaces
General high voltage isolation applications
Input Range
Std.Outputs
Accuracy
0-1000Vdc
See spec sheet for individual model numbers and complete product specifications
Output is electrically isolated from the input and is directly proportional to the input. Unidirectional signals only.
Typical Applications
Monitoring of substations or electric circuit performance, isolation and amplification of shunt output. Many VTU’s are deployed in electric generator and solar field monitoring.
Input Range
Std.Outputs
Accuracy
0-4000Vdc
See spec sheet for individual model numbers and complete product specifications
