HP ESA-E Series Programmer's Manual page 112

Programming Examples
Measuring Noise
{
printf("Could not open a session to HP-IB device at
address 18!\n");
exit(0);
}
/*Clear the analyzer*/
viClear(viESA);
/*Reset the analyzer*/
viPrintf(viESA,"*RST\n");
/*Display the program heading*/
printf("\n\t\t Noise Program \n\n" );
/*Check for the analyzer model number and route the
50 MHz signal accordingly*/
Route50MHzSignal();
/*Set the analyzer center frequency to 50 MHz*/
viPrintf(viESA,"SENS:FREQ:CENT 50e6\n");
/*Set the analyzer span to 10 MHz*/
viPrintf(viESA,"SENS:FREQ:SPAN 10e6\n");
/*Set the analyzer to single sweep mode*/
viPrintf(viESA,"INIT:CONT 0 \n");
/*Trigger a sweep*/
viPrintf(viESA,"INIT:IMM; \n");
/*Check for operation complete*/
viQueryf(viESA, "*OPC?\n", "%d", &lOpc);
if (!lOpc)
{
printf("Program Abort! error ocurred: last command was
not completed!\n");
exit(0);
}
/*Set the marker to the maximum peak*/
viPrintf(viESA,"CALC:MARK:MAX; \n");
/*Check for operation complete*/
viQueryf(viESA, "*OPC?\n", "%d", &lOpc);
if (!lOpc)
{
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