The RMS I/O determines the True Root Mean Square value of a signal. For alternating electric current, RMS is equal to the value of the direct current that would produce the same average power dissipation in a resistive load.

The RMS I/O returns one value, which is the mean value of the RMS values of the individual periods in the input signal.

A typical application of the RMS I/O is logging RMS values to monitor e.g. mains voltage.


To control the behavior of the RMS I/O, several properties are available. These can be accessed through a popup menu which is shown when the I/O is right clicked in the Object Tree. The properties can also be accessed through its settings window which is shown when the I/O is double clicked in the Object Tree. To open the Object tree, click the Show object tree Show object tree button.

RMS control

Common properties and actions

Related information

Duty cycle

The Duty cycle I/O determines the duty cycle of a signal.

Phase difference

The Phase difference I/O determines the phase difference between its two input signals.


The FFT I/O is used for spectral analysis of a signal using a Fast Fourier Transformation


The EMI I/O creates an environment that can be used for EMI pre-compliance testing.