Agilent Technologies E1441A user service AM Modulation and Instrument State Storage, Chapter

AM Modulation and Instrument State Storage

/* 1441_AM.C - This program sets up the E1441A to output an AM waveform.			*/
/*	The program also stores the configuration in memory for subsequent		*/
/*	recall.	*/

#include <stdio.h> #include <visa.h>

/*** FUNCTION PROTOTYPE ***/

void err_handler (ViSession vi, ViStatus x);

#define DEVICE_ADDRESS "GPIB-VXI0::80::INSTR"

void main(void)

{

char buf[512] = {0};

ViStatus err;

ViSession defaultRM, funcgen;

/* Open resource manager and Function Generator sessions*/ err=viOpenDefaultRM(&defaultRM);

if(err != VI_SUCCESS) err_handler(funcgen, err);

err=viOpen(defaultRM, DEVICE_ADDRESS, VI_NULL,VI_NULL, &funcgen); if(err != VI_SUCCESS) err_handler(funcgen, err);

/* Set the timeout value to 10 seconds. */ viSetAttribute(funcgen, VI_ATTR_TMO_VALUE, 10000);

/* Reset the module. */ err=viPrintf(funcgen, "*RST\n");

if(err != VI_SUCCESS) err_handler(funcgen, err);

/* Set the output amplitude to be set for 50 ohm load. */ err=viPrintf(funcgen, "OUTPut:LOAD 50\n");

if(err != VI_SUCCESS) err_handler(funcgen, err);

/* configure the E1441A to output a 5 Vp-p, 5			kHz sine wave */
/* with a 2.5V offset. APPly command is		first	since it		*/
/* presets some functions that follow					*/
err=viPrintf(funcgen,	"SOURce:APPLy:SIN	5000,	2,	2.5\n");
if(err != VI_SUCCESS)	err_handler(funcgen, err);
/* set the amplitude modulation source,		set a	modulation depth			*/
/* of 80%, the modulation waveshape to sine, the				modulating		*/
/* frequency to 200 Hz, and enable AM modulation						*/
err=viPrintf(funcgen,	"SOURce:AM:SOURce	BOTH\n"); /* AM from internal */
if(err != VI_SUCCESS)	err_handler(funcgen, err);

err=viPrintf(funcgen, "SOURce:AM:DEPTh 80\n"); /* mod depth 80% */ if(err != VI_SUCCESS) err_handler(funcgen, err);

err=viPrintf(funcgen, "SOURce:AM:INTernal:FUNCtion SIN\n"); /* AM shape SIN */ if(err != VI_SUCCESS) err_handler(funcgen, err);

err=viPrintf(funcgen, "SOURce:AM:INTernal:FREQuency 200\n"); /* AM freq 200 Hz */ if(err != VI_SUCCESS) err_handler(funcgen, err);

60 Agilent E1441A Application Information Chapter 2