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6. Statistics
(Only for PM6680B and PM6681)
In this example, the counter makes 10000 measurements and uses the statistical func
-
tions to determine MAX, MIN, MEAN, and Standard Deviation. All four results are
sent to the controller.
#include “decl.h”
#include <stdio.h>
#include <process.h>
main ()
{
int Counter, Status, i;
char InString[80];
Counter = ibfind(“DEV10");
ibwrt(Counter, “*CLS; *SRE 16", 13);
ibwrt(Counter, “*RST; :FUNC ‘Freq 1’; :ACQ:APER MIN”, 38);
ibwrt(Counter, “:INP:LEV:AUTO OFF”, 17);
/*Enable statistics on 10000 measurements*/
ibwrt(Counter, “:CALC:AVER:STAT ON; COUN 10000", 30);
ibwrt(Counter, “:TRIG:COUN 10000", 16);
/*Start measurement*/
ibwrt(Counter, “:Init; *OPC?”, 12);
/*Wait for operation complete (MAV)*/
printf(“Waiting for measurement to get ready\n”);
ibwait(Counter, RQS);
/**Read status and response**/
ibrsp(Counter, &Status);
ibrd(Counter, InString, 80);
/*Read maximum value**/
ibwrt(Counter, “:CALC:AVER:TYPE MAX; :CALC:IMM?”, 31);
ibrd(Counter, InString, 80);
InString[ibcnt] = ‘\0’;
printf(“Maximum = %s\n”, InString);
Programming Examples
4-20 ‘C’ for National Instruments PC-IIA, Statistics