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Chapter 3 Programming Your Universal Counter for Remote Operation
Elements of SCPI Commands
Programming Guide 3-73
To Optimize Throughput (HP BASIC)
10 ! This program shows how to set up the counter to transfer data at the
20 ! fastest possible rate. Note that the arming mode is AUTO. This mode
30 ! provides the least resolution of all arming modes.
40 ! The program comments discuss the meaning of each command.
50 ! ASCII result format is to preserve resolution.
60 !
70 CLEAR SCREEN
80 INTEGER I
90 DIM A$(200)[22],Dummy$[22]
100 ASSIGN @Count TO 703
110 CLEAR 703 ! Clear the counter and interface
120 OUTPUT @Count;"*RST" ! Reset the counter
130 OUTPUT @Count;"*CLS" ! Clear event registers and error queue
140 OUTPUT @Count;"*SRE 0" ! Clear service request enable register
150 OUTPUT @Count;"*ESE 0" ! Clear event status enable register
160 OUTPUT @Count;":STAT:PRES" ! Preset enable register and transition
170 ! filters for operation and questionable
180 ! status structures.
190 ! The following lines will provide the highest throughput, regardless
200 ! of the state of the counter before these lines are executed.
210 OUTPUT @Count;":FORMAT ASCII" ! ASCII format for fastest throughput
220 OUTPUT @Count;":FUNC 'FREQ 1'" ! Select frequency
230 OUTPUT @Count;":EVENT1:LEVEL 0" ! Set Ch 1 trigger level to 0 volts
240 OUTPUT @Count;":FREQ:ARM:STAR:SOUR IMM" ! These two lines enable the
250 OUTPUT @Count;":FREQ:ARM:STOP:SOUR IMM" ! AUTO arming mode.
260 OUTPUT @Count;":ROSC:SOUR INT" ! Use internal oscillator. If
270 ! you want to use an external
280 ! timebase, you must select it
290 ! and turn off the automatic
300 ! detection using:
310 ! :ROSC:EXT:CHECK OFF
320 !
330 OUTPUT @Count;":DIAG:CAL:INT:AUTO OFF" ! Disable automatic interpolater
340 ! calibration. The most recent
350 ! calibration values are used in
360 ! the calculation of frequency
370 OUTPUT @Count;":DISP:ENAB OFF" ! Turn off the counter display
380 ! This greatly increases
390 ! measurement throughput.
400 OUTPUT @Count;":CALC:MATH:STATE OFF" ! Disable any post processing.
410 OUTPUT @Count;":CALC2:LIM:STATE OFF"
420 OUTPUT @Count;":CALC3:AVER:STATE OFF"
430 OUTPUT @Count;":HCOPY:CONT OFF" ! Disable any printing operation
440 OUTPUT @Count;"*DDT #15FETC?" ! Define the Trigger command
450 ! This means the command FETC?
460 ! does not need to be sent for
470 ! every measurement, decreasing
480 ! the number of bytes
490 ! transferred over the bus.