104 Chapter 3
Programming Examples
Using Marker Peak Search and Peak Excursion
Using Marker Peak Search and Peak Excursion
Example:
/************************************************************/
/* Using Marker Peak Search and Peak Excursion */
/* */
/* This example is for the E44xxB ESA Spectrum Analyzers */
/* and E740xA EMC Analyzers. */
/* */
/* This C programming example does the following. */
/* The SCPI instrument commands used are given as */
/* reference. */
/* */
/* - Opens a GPIB session at address 18 */
/* - Clears the Analyzer */
/* *CLS */
/* - Resets the Analyzer */
/* *RST */
/* - Sets the analyzer center frequency, span and units */
/* SENS:FREQ:CENT freq */
/* SENS:FREQ:SPAN freq */
/* UNIT:POW DBM */
/* - Set the input port to the 50 MHz amplitude reference */
/* CAL:SOUR:STAT ON */
/* - Set the analyzer to single sweep mode */
/* INIT:CONT 0 */
/* - Prompt the user for peak excursion and set them */
/* CALC:MARK:PEAK:EXC dB */
/* - Set the peak threshold to -90 dBm */
/* TRAC:MATH:PEAK:THR:STAT ON */
/* TRAC:MATH:PEAK:THR -90 */
/* - Trigger a sweep and wait for sweep to complete */
/* INIT:IMM;*WAI */
/* - Set the marker to the maximum peak */
/* CALC:MARK:MAX */
/* - Query and read the marker frequency and amplitude */
/* CALC:MARK:X? */
/* CALC:MARK:Y? */
/* - Close the session */
/************************************************************/
#include <stdio.h>
