Extout Once - Agilent Technologies 3458A User Manual

10 OUTPUT 722;"SUB EXTSRQ"
20 OUTPUT 722;-"PRESET NORM"
30 OUTPUT 722;"RQS 1"
40 OUTPUT 722;"EXTOUT SRQ,POS"
50 OUTPUT 722;"OHMF 10E3"
60 OUTPUT 722;"NPLC 100"
70 OUTPUT 722;"OCOMP ON"
80 OUTPUT 722;"TRIG EXT"
90 OUTPUT 722;"MATH CTHRM10K"
100 OUTPUT 722;"CSB"
110 OUTPUT 722;"SUBEND"
120 OUTPUT 722;"CALL EXTSRQ"
130 END

EXTOUT ONCE

10 OUTPUT 722;"SUB EXTONCE"
20 OUTPUT 722;"EXTOUT ONCE"
25
30 OUTPUT 722;"PRESET FAST
40 OUTPUT 722;"MEM FIFO"
50 OUTPUT 722;"NRDGS 20"
60 OUTPUT 722;"TARM SGL"
70 OUTPUT 722;"EXTOUT ONCE"
75
80 OUTPUT 722;"OCOMP ON"
90 OUTPUT 722;"OHM 1E3"
100 OUTPUT 722;"NRDGS 40"
110 OUTPUT 722;"TARM SGL
120 OUTPUT 722;"SUBEND"
130 OUTPUT 722;"CALL EXTONCE"
140END
to assert SRQ (RQS command). The EXTOUT SRQ pulse does not
necessarily occur whenever the SRQ bit is set; it occurs whenever an
enabled status event occurs.
The following program uses the SRQ event to synchronize the multimeter to
external equipment. The program downloads a subprogram to the
multimeter. When the subprogram is called by the controller (line 120), it
configures the multimeter for high-accuracy temperature measurements
using a 10k(W) thermistor. After the subprogram has been called and
executed, bit 0 is set in the status register (program memory execution
completed). This asserts a GPIB SRQ (enabled by line 30) and causes a pulse
on the Ext Out connector (specified by line 40). This pulse signals external
equipment that the multimeter is configured and ready to make
measurements.
! STORE SUBPROGRAM NAMED "EXTSRQ"
! PRESET,TRIG SYN, TARM AUTO, NRDGS 1,AUTO
!ENABLE SUBPROGRAM EXECUTION COMPLETE BIT
!SRQ EXTOUT EVENT, HI-GOING PULSE
!2-WIRE OHMS, 10k
!100 PLCS INTEGRATION TIME
!ENABLE OFFSET COMPENSATION
!EXTERNAL TRIGGER EVENT
!ENABLE 10k
!CLEAR STATUS REGISTER
!END OF SUBPROGRAM
!CALL SUBPROGRAM
Executing the EXTOUT ONCE command produces a single 1µS pulse on
the multimeter's Ext Out connector. After executing EXTOUT ONCE, the
mode reverts to OFF (the EXTOUT signal is disabled). As shown in the
following program. EXTOUT ONCE is useful in subprograms to indicate
the completion of the subprogram, or a segment of the subprogram, to
external equipment.
!STORE SUBPROGRAM NAMED "EXTONCE"
!SIGNAL EXTERNAL EQUIPMENT TO SWITCH
!TO DC VOLTAGE SIGNAL
!FAST READINGS, TARM SYN, TRIG AUTO"
!ENABLE READING MEMORY, FIFO MODE
!20 READINGS PER TRIGGER
!TRIGGER 20 READINGS
!SIGNAL EXTERNAL EQUIPMENT TO SWITCH TO
!RESISTANCE MEASUREMENT
!ENABLE OFFSET COMPENSATION
!2-WIRE OHMS, 1K
!40 READINGS PER TRIGGER
!TRIGGER 40 READINGS"
!END OF SUBPROGRAM
!CALL SUBPROGRAM
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THERMISTOR MATH OPERATION
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Chapter 4 Making Measurements 115