136 Chapter 3
Programming Examples
Using Limit Lines
/* - Check to see if limit line passes or fails. It should */
/* pass. */
/* CALC:LLINE:FAIL? */
/* - Pause for 5 seconds. */
/* - Deactivate the 50 MHz alignment signal. */
/* CAL:SOUR:STAT OFF */
/* - The limit line test should fail. */
/* - Close the session. */
/************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <ctype.h>
#include <string.h>
#include <windows.h>
#include "visa.h"
#define YIELD Sleep(5000)
#define hpESA_IDN_E4401B "Hewlett-Packard, E4401B"
#define hpESA_IDN_E4411B "Hewlett-Packard, E4411B"
#define hpEMC_IDN_E7401A "Hewlett-Packard, E7401A"
ViSession defaultRM, viESA;
ViStatus errStatus;
ViChar cIdBuff[256]= {0};
char cEnter = 0;
int iResult = 0;
long lLimitTest =0L;
/*Set the input port to 50MHz amplitude reference*/
void Route50MHzSignal()
{
viQueryf(viESA, "*IDN?\n", "%t", &cIdBuff);
iResult = (strncmp( cIdBuff, hpESA_IDN_E4401B, strlen(hpESA_IDN_E4401B)) &&
strncmp( cIdBuff, hpESA_IDN_E4411B, strlen(hpESA_IDN_E4411B)) && strncmp( cIdBuff,
hpEMC_IDN_E7401A, strlen(hpEMC_IDN_E7401A)));
if( iResult == 0 )
{
/*Set the input port to the 50MHz amplitude reference for the models*/
/*E4401B, E4411B, and E7401A*/
viPrintf(viESA,"CAL:SOUR:STAT ON \n");
}
else
{
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