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3. Frequency Profiling
Frequency profiling visualizes frequency variations for a certain time. This program
gives an output file called:
PROFILE.DAT. If this file is imported to a spreadsheet program, such as Excel, you
can create a graph like the one in the figure below.
#include “decl.h”
#include <stdio.h>
#include <process.h>
#include <string.h>
main ()
{
int Counter, i;
char ArmString[80],
InString[80];
double ArmDelay;
FILE *ofp;
if (ofp = fopen(“PROFILE.DAT”, “w”)) {
Counter = ibfind(“DEV10");
/*Enable arming, etc.*/
ibwrt(Counter, “:TRIG:COUN 1; :ARM:COUN 1", 25);
Programming Examples
4-16 ‘C’ for National Instruments PC-IIA, Frequency Profiling
Figure 4-2 This figure is the results of frequency profiling on a
sweep generator.