HP ESA-E Series Programmer's Manual page 92

Programming Examples
Reading Trace Data Using 32-bit Real Format (HP-IB)
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)));
if( iResult == 0 )
{
/*Set the input port to the 50 MHz amplitude reference
for the models E4411B, E4401B*/
viPrintf(viESA,"CAL:SOUR:STAT ON \n");
}
else
{
/* For the analyzers having frequency limits >= 3GHz,
prompt the user to connect the amplitude reference output to
the input*/
printf ("Connect amplitude reference output to the
input \n");
printf ("......Press any key to continue \n");
scanf( "%c",&cEnter);
/*Externally route the 50 MHz Signal*/
viPrintf(viESA,"CAL:SOUR:STAT ON \n");
}
}
void main()
{
/*program variable*/
ViStatus viStatus= 0;
ViChar _VI_FAR cResult[5000];
ViReal32 dTraceArray[401] = {0};
char cBufferInfo[6]= {0};
long lNumberBytes =0L;
long lOpc =0L;
unsigned long lRetCount = 0L;
int iSize = 0;
FILE *fTraceFile;
/* Open an HP-IB session at address 18*/
viStatus=viOpenDefaultRM(&defaultRM);
viStatus=viOpen(defaultRM,"GPIB0::18",VI_NULL,VI_NULL,&
viESA);
if(viStatus)
{
printf("Could not open a session to HP-IB device at
address 18!\n");
exit(0);
}
/*Clear the analyzer */
viClear(viESA);
3-28 Chapter 3