Fluke PM6681R, PM6685R 16 ‘C’ for National Instruments PC-IIA, Frequency Profiling, File, Ofp

Programming Examples

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.

Figure 4-2This figure is the results of frequency profiling on a sweep generator.

#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);

4-16 ‘C’ for National Instruments PC-IIA, Frequency Profiling