HP 132A, 53131A To Make a Frequency Measurement (Turbo C)

Chapter 3 Programming Your Universal Counter for Remote Operation

Elements of SCPI Commands

To Make a Frequency Measurement (Turbo C)

/* This program sets up the counter to make 10 freqeuncy measurements on channel 1, using a 0.1 second gate time.

The results are displayed on the computer CRT

The program comments discuss the meaning of each command. ASCII result format is used to preserve resolution. */

#include <stdio.h> #include <string.h> #include "CHPIB.H" #include "CFUNC.H"

void sendhp(char *);		/* function to send command to counter */
/* global data */
long ctr=703;		/* Counter is at address 03. HP-IB is at select code 7
*/
int	error;
void main()
{	long isc=7;		/* Select code 7 */
	int state=1;		/* Used in IOEOI		*/
	int i;		/* Used for loop counter */
	int samples=10;		/* Number of measurements to take */
	int length=23;		/* Max number of bytes per measurements */
	char freq[23];		/* Array to hold frequency string */
	IORESET(isc);		/* Clear the HP-IB interface */
	sendhp("*RST");		/* Reset the counter */
	sendhp("*CLS");		/* Clear event registers and error queue */
	sendhp("*SRE 0");		/* Clear service request enable register */
	sendhp("*ESE 0");		/* Clear event status enable register */
	sendhp(":STAT:PRES");		/* Preset enable registers and transition
			filters for operation and questionable
			status structures */
	IOEOI(isc,state);		/* Enable use of EOI */
	sendhp(":FUNC 'FREQ 1'");			/* Measure frequency on channel 1
					Note that the function must
					be a quoted string. The actual
					string sent to the counter is
					'FREQ 1'. */
	sendhp(":FREQ:ARM:STAR:SOUR IMM");			/* These 3 lines enable the */
	sendhp(":FREQ:ARM:STOP:SOUR TIM");			/* time arming mode with a */
	sendhp(":FREQ:ARM:STOP:TIM .1");			/* 0.1 second gate time */

Programming Guide 3-91