Keysight Technologies 3458A Guide D'utilisation page 179

80 OUTPUT 722;"TRIG SYN"!SYN TRIGGER EVENT
90 ENTER 722;Rdgs(*)!SYN EVENT, ENTER NULL CORRECTED READINGS
100 PRINT Rdgs(*)!PRINT NULL CORRECTED READINGS
110 END
The following program performs the post-process NULL operation on 20 readings.
After executing the MMATH NULL command, 21 readings are taken and stored in
reading memory in FIFO mode. Line 80 recalls the first reading taken which is
stored in the OFFSET register. The value in the OFFSET register is then changed to
3.05. The remaining 20 readings in memory are recalled and the NULL operation
is performed on each.
10 OPTION BASE 1!COMPUTER ARRAY NUMBERING STARTS AT 1
20 DIM Rdgs(20)!DIMENSION ARRAY FOR 20 READINGS\
30 OUTPUT 722;"PRESET NORM"!PRESET,NRDGS 1,AUTO, DCV 10
40 OUTPUT 722;"MEM FIFO"!ENABLE READING MEMORY, FIFO MODE
50 OUTPUT 722;"MMATH NULL"!ENABLE POST-PROCESS NULL OPERATION
60 OUTPUT 722;"NRDGS 21"!21 READINGS PER TRIGGER
70 OUTPUT 722;"TRIG SGL"!TRIGGER READINGS
80 ENTER 722;A!RECALL FIRST READING USING IMPLIED READ
90 OUTPUT 722;"SMATH OFFSET,3.05"!WRITE 3.05 TO OFFSET REGISTER
100 ENTER 722;Rdgs(*)!RECALL READINGS USING IMPLIED READ,
105!PERFORM NULL OPERATION ON EACH
110 PRINT Rdgs(*)!PRINT NULL MODIFIED READINGS
120 END
SCALE
The SCALE operation modifies each reading by subtracting an offset and dividing
by a scale factor. The equation is:
Notice that the default values do not change the reading (they subtract 0 and
divide by 1). You can change the values in the OFFSET register or the SCALE
register using the SMATH command.
Keysight 3458A User's Guide
Result = (Reading - OFFSET)/SCALE
Where:
Reading is any reading.
OFFSET is the value stored in the OFFSET register (default = 0: notice that the
first reading is not stored in OFFSET as it was for the NULL operation).
SCALE is the value stored in the SCALE register (default = 1).
Making Measurements 4
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