Agilent Technologies ESA-E Series Programmer's Manual page 138

Programming Examples
Measuring Harmonic Distortion (RS-232 )
Measuring Harmonic Distortion (RS-232 )
/************************************************************ /
/*
Measuring Harmonic Distortion (RS-232)
* /
/*
* /
/* This C programming example does the following .
*/
/*
The SCPI instrument commands used are given as
* /
/* reference .
*/
/*
*/
/* -
Opens an RS-232 session to the COM1 serial port
* /
/* - Clears the Analyzer
* /
/*
*CLS
* /
/* - Resets the Analyzer
* /
/* *RST
* /
/* - Set the input port to the 50 MHz reference
* /
/* CAL :SOUR :STAT ON
* /
/* - Set the analyzer center frequency to the fundamental
* /
/* SENS :FREQ :CENT freq
* /
/* - Set the analyzer to 10 MHz span
* /
/* SENS :FREQ :SPAN 10 MHZ
* /
/* - Set the analyzer to single sweep mode
* /
/* INIT :CONT 0
* /
/* - Trigger a sweep
* /
/*
INIT :IMM
* /
/* - Check for operation complete
* /
/*
*OPC?
* /
/* -
Perform the peak search
* /
/* CALC :MARK :MAX
* /
/* - Set the marker to reference level
* /
/* CALC :MARK :SET :RLEV
* /
/* - Trigger a sweep
* /
/* INIT :IMM
* /
/* - Check for operation complete
* /
/* *OPC?
* /
/* -
Perform the peak search
* /
/* CALC :MARK :MAX
* /
/* - Change VISA timeout to 60 seconds
* /
/* - Activate signal track
* /
/* CALC :MARK :TRCK :STAT ON
* /
/* - Perform narrow span and wait
* /
/* SENS :FREQ :SPAN 10e4
* /
/* - Check for operation complete
* /
/* *OPC?
*/
/* -
De-activate signal track
*/
3-78 Chapter 3