Fluke PM6685R, PM6681R manual 4-14 ‘C’ for National Instruments PC-IIA, Limit Testing

Programming Examples

1. Limit Testing

This program uses limit testing to check that the frequency is above a preset value.

#include “decl.h”
#include <stdio.h>
#include <process.h>
main ()
{
int	Counter, Status, i;
char	InString[80];
Counter = ibfind(“DEV10");

/*Set continuous frequency measurement*/

ibwrt(Counter, “*RST; *CLS; :FUNC ‘Freq 1’; :INIT:CONT ON”, 41);

/*Enable limit monitoring, limit 1 MHz*/

ibwrt(Counter, “:CALC:LIM ON; LIM:UPP 1E6; UPP:STAT ON”, 38); ibwrt(Counter, “:STAT:DREG0:ENAB 2; *SRE 1", 26);

/*Wait until the limit is passed*/ printf(“Waiting for limit to be passed\n”); ibwait(Counter, RQS);

/**Read status and device status register**/ ibrsp(Counter, &Status);

ibwrt(Counter, “:STAT:DREG0:EVEN?”, 17); ibrd(Counter, InString, 80);

/*Read frequency**/ ibwrt(Counter, “READ?”, 5); ibrd(Counter, InString, 80); InString[ibcnt] = ‘\0’; printf(“Frequency = %s\n”, InString);

/*Disable continuous measurement*/ ibwrt(Counter, “:INIT:CONT OFF”, 14);

exit(0);

}

4-14 ‘C’ for National Instruments PC-IIA, Limit Testing