Chapter 2 51
Programming Examples
GPIB Programming Examples
Generating a Step-Swept Signal Using VISA and C
In this example the VISA library is used to set the signal generator for a continuous step sweep on a defined
set of points from 500 MHz to 800 MHz. The number of steps is set for 10 and the dwell time at each step is
set to 500 ms. The signal generator will then be set to local mode which allows the user to make adjustments
from the front panel. Launch Microsoft Visual C++ 6.0, add the required files, and enter the following code
into your .cpp source file.
The following program example is available on the PSG Documentation CD-ROM as visaex7.cpp.
//****************************************************************************************
// PROGRAM FILE NAME:visaex7.cpp
//
// PROGRAM DESCRIPTION:This example will program the signal generator to perform a step
// sweep from 500-800 MHz with a .5 sec dwell at each frequency step.
//
//****************************************************************************************
#include <visa.h>
#include "StdAfx.h"
#include <iostream>
void main ()
{
ViSession defaultRM, vi;// Declares variables of type ViSession
// vi establishes instrument communication
ViStatus viStatus = 0;// Declares a variable of type ViStatus
// for GPIB verifications
viStatus=viOpenDefaultRM(&defaultRM); // Initialize VISA session
// Open session to GPIB device at address 19
viStatus=viOpen(defaultRM, "GPIB::19::INSTR", VI_NULL, VI_NULL, &vi);
if(viStatus){// If problems, then prompt user
printf("Could not open ViSession!\n");
printf("Check instruments and connections\n");
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