Pendulum CNT-91 - Input Amplifier

// Reset counter to known state ibwrite(counter,
“*rst;*cls”);
// Setup for period measurement ibwrite(counter, “FUNC
‘PER 1’”);
// Some settings...
ibwrite(counter, “INP:LEV:AUTO OFF;:INP:LEV 0;COUP DC”);
ibwrite(counter, “TRIG:COUNT 1000;:ARM:COUNT 1");
ibwrite(counter, ”DISP:ENAB ON"); ibwrite(counter,
“FORMAT ASCII;:FORMAT:TINF OFF”);
ibwrite(counter, “*ESE 1;*SRE 32");
// On the safe side: Check that setup was OK, all commands
correctly spelled etc
ibwrite(counter, ”syst:err?");
ibrd(counter, buf, 100L); buf[ibcnt]=0; printf(“Setup
error: %s\n”, buf);
// Measure 1000 samples
Start = clock();
ibwrite(counter, “INIT;*OPC”);
// Wait for completion
ibwait(counter, RQS);
/* Read status and event registers to clear them */
ibrsp(counter, &Status);
ibwrite(counter, “*ESR?”);
ibrd(counter, buf, 100L);
ibwrite(counter, “FETC:ARR? 1000");
ibrd(counter, bigbuf, 30000L);
if (ibcnt >0) {
pbuf = bigbuf;
for (i=0; i<1000; i++) {
for (j=0; pbuf[j]!=’,’ && pbuf[j]!=’\0’; j++);
pbuf[j]=’\0’;
if (i%50 == 0) printf(”Result %d: %s\n", i,
pbuf);
pbuf+=j+1;
}
}
Stop = clock();
Programming Examples
4-6 Block Measurements (Ex. #2)