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Measuring Noise
/************************************************************/
/* Measuring Noise
/*
/* 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
/* - Resets the Analyzer
/*
*RST
/* - Sets the center frequency and span
/*
SENS:FREQ:CENT 50 MHZ
/*
SENS:FREQ:SPAN 10 MHZ
/* - Set the input port to the 50 MHz amplitude reference
/*
CAL:SOUR:STAT ON
/* - Set the analyzer to single sweep mode
/*
INIT:CONT 0
/* - Trigger a sweep and wait for sweep completion
/*
INIT:IMM;*WAI
/* - Set the marker to the maximum peak
/*
CALC:MARK:MAX
/* - Set the analyzer to active delta marker
/*
CALC:MARK:MODE DELT
/* - Set the delta marker to 2 MHZ
/*
CALC:MARK:X 2E+6
/* - Activate the noise marker function
/*
CALC:MARK:FUNC NOIS
/* - Trigger a sweep and wait for sweep completion
/*
INIT:IMM;*WAI
/* - Query the marker delta amplitude from the analyzer
/*
CALC:MARK:Y?
/* - Report the marker delta amplitude as the carrier to
/*
noise ratio in dBc/Hz
/* - Close the session
/************************************************************/
#include <stdio.h>
#include <stdlib.h>
Chapter 3
Programming Examples
Measuring Noise
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