158 Sequoia Series
6.2.7 Waveform Shapes
At *RST, the power source generates a sine waveform when in AC or AC+DC mode, but other shapes
can be selected. There are built-in tables for sine, square and clipped sine waveforms. In addition, the
user can define arbitrary waveshapes by creating a 1024 point table of amplitudes for a single cycle.
As shown in the following examples, the FUNCtion[:SHAPe] command selects the output waveform.
Square Waveform
To select the square output waveform, use:
FUNCtion:SHAPe SQUare
Clipped Waveform
To select a clipped sine waveform use:
FUNCtion:SHAPe CSINe
To set the clipping level to 10% THD, use:
FUNCtion:SHAPe:CSINe 10
The clipping level is specified in terms of the percent total harmonic distortion in the clipped sine
waveform.
User-Defined Waveform
To create a user-defined waveform, use TRACe:DEFine command to create a name for the waveform,
then use the TRACe[:DATA] command to send the list of 1024 amplitude points. The waveform can
then be selected using the FUNCtion command. For example, a waveform named "Distortion" can be
created with:
TRACe:DEFine DISTORTION
TRACe:DATA DISTORTION, n1, n2, n3, ..., n1024
where n1 ... n1024 are the data points that define the relative amplitudes of exactly one cycle of the
waveform. The first data point defines the amplitude that will be output at 0 degrees phase reference.
Data points can be in any arbitrary units. The power source scales the data to an internal format that
ensures that the correct AC rms voltage is output when the waveform is selected. When queried, trace
data is returned as normalized values in the range of ±1. Waveform data is stored in nonvolatile
memory and is retained when input power is removed. Up to 50 user defined waveforms may be
created and stored in one of 4 separate groups.
Because waveform shape commands are coupled with the voltage commands, changing waveforms
without changing the programmed voltage may result in an error if the resulting peak voltage amplitude
exceeds the maximum voltage rating of the power source. Refer to "Coupled Commands" for more
information.
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