User`s guide

Programming Your Instruments

Example Programs

#include <stdio.h>

#include <math.h>

// Specify the default address

#define DEFAULT_LOGICAL_ADDRESS OLESTR("GPIB0::10::INSTR")

#import "IviDriverTypeLib.dll" no_namespace

#import "IviFgenTypeLib.dll" no_namespace

#import "VisaCom.tlb" no_namespace

#import "Agilent33220.dll" no_namespace

void main()

{

BSTR TxtAddress = DEFAULT_LOGICAL_ADDRESS;

long Ncycles = 10; /* Define number of sinewave cycles */

double Damp_factor = -5; /* Define damping factor */

double pi = 3.14159; /* Define pi */

long i;

IAgilent33220Ptr Fgen;

CoInitialize(NULL);

Fgen.CreateInstance(__uuidof(Agilent33220));

Fgen->Initialize(TxtAddress, VARIANT_FALSE, VARIANT_TRUE, "");

Fgen->Utility->Reset();// Reset the function generator

Fgen->Status->Clear();// Clear errors and status registers

Fgen->System->TimeoutMilliseconds = 40000; // Set timeout to 40

seconds for long download strings

Fgen->Output->Frequency = 5000; // Output frequency is 5 kHz

Fgen->Output->Load = 50; // Output termination is 50 Ohms

Fgen->Output->Voltage->Amplitude = 5; // Output amplitude is 5 Vpp

// Compute waveform

fprintf(stderr, "Computing Waveform...\n");

// Create an array of data

SAFEARRAY *psa;

// Build a SafeArray of integer values.

SAFEARRAYBOUND bounds = {16000, 0};