HP 132A, 53131A To Optimize Throughput (Turbo C) (Continued)

Chapter 3 Programming Your Universal Counter for Remote Operation

Elements of SCPI Commands

To Optimize Throughput (Turbo C) (Continued)

sendhp(":ROSC:SOURCE INT");	/* Use internal oscillator. If
	you want to use an external
	timebase, you must select it
	and turn off the automatic
	detection using:
	:ROSC:EXT:CHECK OFF */
sendhp(":DIAG:CAL:INT:AUTO OFF");	/* Disable automatic interpolater
	calibration. The most recent
	calibration values are used in
	the calculation of frequency */
sendhp(":DISP:ENABLE OFF");	/* Turn off the counter display */
sendhp(":HCOPY:CONT OFF");
sendhp(":CALC:MATH:STATE OFF");	/* Disable any post processing */
sendhp(":CALC2:LIM:STATE OFF");
sendhp(":CALC3:AVER:STATE OFF");
sendhp("*DDT #15FETC?");	/* Define the Trigger command. This
	means the command FETC? does not
	need to be sent for every
	measurement, decreasing the
	number of bytes transferred over
	the bus */
sendhp(":INIT:CONT ON");	/* Put the counter in Run mode */
sendhp("FETCH:FREQ?");	/* Fetch the frequency to be */
IOENTER(ctr,&exp_freq);	/* for the expected frequency */
strcpy(destination,":FREQ:EXP1 ");	/* Copy string */
sprintf(&destination[strlen(destination)],"%e",exp_freq); /* Append
	expected frequency value */
sendhp(destination);	/* Send the expected frequency */
	/* This number must be within 10%
	of the Ch 1 input frequency.
	Using this greatly increases
	throughput, but is not
	recommended for signals that
	change by more than 10% */
puts("Transferring and processing data\n");
for (i=1; i<=readings ;i++)
{
IOTRIGGER(ctr);	/* Trigger the counter and */
IOENTERS(ctr,freq[i],&length);	/* read the data */
}

printf("Measurement complete. Press a key to continue.\n"); getch();

}

Programming Guide 3-97