California Instruments 2253iX Manual de instrucciones descargar pdf (Pagina 125)

Programming Manual Compact i / iX Series

AMETEK Programmable Power Division 125

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

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.

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California Instruments 2253iX Manual de instrucciones Pagina 125