Click or drag to resize

Rectangular

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Creating and defining the Rectangular signal

  1. There are two ways to create a Rectangular signal:

    1. In the simulation tree, right click Sources or Signals and select Create Signal. Choose Square Image 16 Rectangular.

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    2. Within the signals panel under the EMA3D tab in the ribbon, select the Rectangular waveform Square Image 16.

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  2. After adding a signal, the signal edit window will appear with a graph of the signal and various parameters that can be adjusted. The signal can be edited immediately or at a later time by right clicking the signal name in the Simulation Tree and selecting edit in the pop-up menu. These parameters are described in the table at the end of this section. Additionally, the frequency spectrum of the signal can be inspected by clicking FFT in the top left of the window.

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  3. If you do not wish to edit the signal close out of the signal window using the small x in the signal tab beneath the model window signalsx.

  4. Both of the above options will place the newly-created signal in the Simulation Tree under Signals within the Sources node.

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  5. To add the signal to a source, click and hold the signal within the Signals node in the Simulation Tree and then drag and drop it on the source (e.g., on the plane wave). The signal should then be nested beneath the corresponding source.

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Rectangular waveform

Entry

Meaning

Name

The display name of the signal

Time - End [s]

The simulation time the signal turns off. The default end time matches the simulation end time. Time - End can be changed only if the field Same as simulation is set to False

Time - Start [s]

The simulation time the signal turns on. The default start time matches the simulation start time. Time - Start can be changed only if the field Same as simulation is set to False

Time - Step [s]

The sample rate of the signal. The default step time matches the simulation step time. Time - Step can be changed only if the field Same as simulation is set to False

Amplitude (A)

The waveform amplitude

Duty Cycle

Fraction of period the signal is on (0.0-1.0)

Fall Time [s]

Time for signal to reach designated low value from high value

Frequency (f) [Hz]

The waveform frequency

Rise Time [s]

Time for signal to reach designated high value from low value

Shift X (Δt) [s]

Shift the beginning of the waveform relative to t=0s. This parameter differs from Time - Start. In Time - Start the original signal does not change, it simply waits to turn on until the specified time. In Shift X (Δt), the signal is recalculated using the time specified in Shift X (Δt) as the new t=0s such that in the wave equation t is replaced by (t-Δt), and this signal starts immediately. So, for example, in a damped sine wave, changing Shift X (Δt) to a positive value will cause an increase in the initial amplitude as the entire wave is shifted to the right along the X axis. Note that all signals MUST start at 0 or the EMA3D simulation will provide a warning and fail when run.

Shift Y (Δy)

Shifts the waveform amplitudes relative to 0. Note that all signals MUST start at 0 or the EMA3D simulation will provide a warning and fail when run.

See Also

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