AMETEK Lx Series II Programming Manual - Manual (Page 132)

Programming Manual Lx \ Ls Series II
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At *RST the slew rate is set to INFinity, which means that ac voltage changes occur at the fastest
possible slew rate. The slew rate applies to programmed changes in ac output amplitude while the
unit is operating in fixed mode. Amplitude changes made by the step, pulse, and list transients are
controlled by the same rules that apply to all other functions that are subject to transient control.
See "Programming Transient Outputs".
Output voltage changes caused by the OUTPut:STATe command, by a protection feature
disabling the output, or as a result of load changes are not subject to this slew rate control.
Frequency Slew
The AC source also has the ability to control the slew rate of frequency changes. To set the
frequency slew rate to 30 Hz per second, use:
FREQuency:SLEW 30
At *RST the slew rate is set to INFinity, which means that frequency changes occur
instantaneously. The frequency slew rate applies to programmed changes in frequency while the
unit is operating in fixed mode. Frequency changes made by the step, pulse, and list transients
are controlled by the same rules that apply to all other functions that are subject to transient
control. See "Programming Transient Outputs".
6.2.1 Waveform Shapes
At *RST, the AC source supplies a sine waveform, 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 CSINusoid
To set the clipping level to 50%, use:
FUNCtion:SHAPe:CSINusoid 50
The clipping level is the percentage of the peak amplitude at which clipping occurs.
The clipping level can also be specified in terms of the percent total harmonic distortion in the
clipped sine waveform by adding a THD suffix to the command. For example;
FUNCtion:SHAPe:CSINusoid 10 THD
sets the clipping level so that the clipped sine has 10% distortion.
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