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540 ! The following commands will measure the frequency on channel 1.
550 ! The MEAS? query can be broken down into CONF and READ? commands.
560 ! The CONF and READ? allow more flexibility than the MEAS? query.
570 ! CONF can be used to configure a measurement. Additional commands
580 ! can then be issued to fine tune the measurement setup. The READ?
590 ! command than reads the result. In the following example, a frequency
600 ! measurement is configured, then, as an example for changing the setup
610 ! created by the CONF command, the counter is programmed for a trigger
620 ! level of 50 mV. (The CONF command tells the counter to use the AUTO
630 ! trigger level mode) Finally, the data is read using the READ? command.
640
PRINT
650
PRINT "Frequency measured using CONF:FREQ (@1) and READ?"
660
OUTPUT @Count;"CONF:FREQ (@1)"
670
OUTPUT @Count;":EVENT1:LEVEL .05" ! Set trigger level to 50 mV
680
OUTPUT @Count;"READ?"
690
ENTER @Count;Freq$
700
PRINT
710
PRINT "Frequency = ";Freq$
720
PRINT
730
RETURN
740 !
750 !
760 Init_fetc:! Use INIT and FETCH to read frequency and period
770 ! The READ? command can be broken down into INIT and FETCH?, providing
780 ! even more measurement flexibility. By using FETCH?, you can retrieve
790 ! results based on already acquired data. For example, period can be
800 ! derived from a frequency measurement, without a new acquisition.
810 ! The following example uses CONF to set up a frequency measurement.
820 ! The trigger level is then changed to -50 millivolts and an INIT is
830 ! performed, starting the measurement process. The data is read using
840 ! the FETCH:FREQUENCY? command. The period can then be read by sending
850 ! FETCH:PERIOD?, this time asking for the period.
860
PRINT
870
PRINT "Frequency and Period measured using CONF:FREQ (@1), INIT, FETCH?"
880
OUTPUT @Count;"CONF:FREQ (@1)"
890
OUTPUT @Count;":EVENT1:LEVEL -.05"! Change trigger level
900
OUTPUT @Count;"INIT"
910
OUTPUT @Count;"FETCH:FREQUENCY?"
920
ENTER 703;Freq$
930
PRINT
940
PRINT "Frequency = ";Freq$
950
OUTPUT @Count;"FETCH:PERIOD?"
960
970
980
ENTER @Count;Period$
990
PRINT
1000
PRINT "Period = ";Period$
1010
PRINT
1020
RETURN
1030
END
Chapter 3 Programming Your Universal Counter for Remote Operation
Elements of SCPI Commands
Easiest Way to Make a Measurement (HP BASIC) (Continued)
Programming Guide
! Configure for frequency measurement
! Ask for data
! Configure for frequency measurement
! Start a measurement
! Ask for frequency result
! Ask for period result derived from
! frequency measurement. Note that
! another measurement was not made.
3-61
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