Agilent Technologies ESA-E Series Programmer's Manual page 107

Programming Examples
Using Limit Lines
/*Route50MHzSignal() ;
/*Display the program heading * /
printf("\n\t\t Limit Lines Program \n\n" ) ;
/*Set to Frequency Domain Mode* /
viPrintf(viESA,"CALC :LLINEI :CONT :DOM FREQ\n") ;
/*Delete any current limit line and define the upper limit lin e
to have the following frequency/amplitude pairs* /
viPrintf(viESA,"CALC :LLINE1 :TYPE UPP\n") ;
/* Turn on display* /
viPrintf(viESA,"CALC :LLINE1 :DISP ON\n") ;
/*Send the upper limit line data* /
viPrintf(viESA,"CALC :LLINE1 :DATA 40E06,-50,1, 45E06,-20,1, 50E06,-15,1 ,
55E06,-20,1, 60E06,-50,1\n") ;
/* Turn on display* /
viPrintf(viESA,"CALC :LLINEI :DISP ON\n") ;
/*Delete any current limit line and define the lower limit lin e
to have the following frequency/amplitude pairs* /
viPrintf(viESA,"CALC :LLINE2 :TYPE LOW\n") ;
/*Send the lower limit line data* /
viPrintf ( viESA, "CALC :LLINE2 :DATA
40E06,-100,1,49 .99E06,-100,1,50E06,-30,1,50 .01E06,-100,1,60E06,-100,1\n") ;
/* Turn on display* /
viPrintf(viESA,"CALC :LLINE2 :DISP ON\n") ;
/*Turn the limit line test function on .* /
viPrintf(viESA,"CALC :LLINE2 :STAT ON\n") ;
/*Set the analyzer to a center frequency of 50 MHz, span to 20 MHz ,
and resolution bandwidth to 1 MHz .* /
viPrintf(viESA,"SENS :FREQ :CENT 50e6\n") ;
viPrintf(viESA,"SENS :FREQ :SPAN 20e6\n") ;
viPrintf(viESA,"SENS :BWID :RES 1e6\n") ;
/*Set the analyzer reference level to 0 dBm* /
viPrintf(viESA,"DISP :WIND :TRAC :Y :SCAL :RLEV 0 \n") ;
/*
Check for the instrument model number and route the 50MHz-signal accordingly* /
Chapter 3
3-47