HP 8163A Programming Manual page 150

Programming Examples
How to Measure Power using FETCH and READ
/* now the read command is used in the same manner to
demonstrate the difference between fetch and read*/
/* read also 10 values, compare them and display the result; */
for (i = 0; i < 10; i++)
{
/*
In comparision to the "FETCH" command, the "READ" command implies
triggering a measurement.
Make sure the timeout set is greater than the adjusted
averaging time, so that the READ command will not time out.
*/
/* send the read command */
errStatus = viQueryf(vi,"READ1:CHAN1:POW?\n","%t",replyBuf);
checkError(vi,errStatus);
if(i)
{
if(!strcmp(compBuf,replyBuf)) printf("Same:%s",replyBuf);
else printf("New :%s",replyBuf);
}
else printf("\nFirst:%s",replyBuf);
/*copy new value to compare buffer*/
strcpy(compBuf,replyBuf);
}
/* loop, until a key is pressed */
while(!scanf("%c",&c));
checkError(vi,errStatus);
/* close the session */
viClose(vi);
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