HP 132A User Manual download pdf (Page 165)

Chapter 3 Programming Your Universal Counter for Remote Operation

Elements of SCPI Commands

Programming Guide 3-97

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();

}

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HP 132A User Manual Page 165

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