Agilent Technologies 3458A Guia do Utilizador descarregar pdf (Página 268)

268 Chapter 7 BASIC Language for the 3458A

OUTPUT 722; "LET TIME_INT =40*3E-3"

Variables can replace numeric parameters in any 3458A command that uses

numeric parameters. Two examples uses are (1) numeric data storage and (2)

numeric calculations. The following sections discuss these two uses.

Variables for Data

Storage

At power-on, numeric output data generated by the 3458A is placed into the

GPIB output buffer where it can be sent to the system controller. However,

for some applications you may want to store the output data directly into the

multimeter's internal memory. The ENTER command takes one reading out

of reading memory (destructively) and places the value in the specified

variable or array location.

The following program uses the ENTER command within a 3458A

subroutine to store readings.

10 OUTPUT 722; "SUB DMM_CONF"

20 OUTPUT 722; "NRDGS 100"

30 OUTPUT 722; "TRIG SGL"

40 OUTPUT 722; "INTEGER I"

50 OUTPUT 722; "FOR I = 1 TO 100"

60 OUTPUT 722; " ENTER A[I]"

70 OUTPUT 722; "NEXT I"

80 OUTPUT 722; "SUBEND"

90 !

100 OUTPUT 722; "CALL DMM_CONF"

110 END

Numeric Calculations Any variables, whether simple or array, can be used in numeric calculations.

Several math functions are available in the 3458A command set to allow you

to manipulate data. The 3458A's math functions are described in more detail

later in this supplement.

Reading Multimeter

Values

The OUTPUT command returns the value of a specified variable. An

example is included below to illustrate the use of the OUTPUT command.

10 DIM A$[50] !Dimension controller variable

20 OUTPUT 722; "LET VAL=COS(.5235)!Compute value

30 OUTPUT 722; "OUTPUT VAL" !Read result into variable

40 ENTER 722: A$ !Enter result

50 PRlNT A$ !Print result

60 END

Arrays You can allocate memory space in the 3458A for one-dimensional arrays.

For real arrays, use either the DIM name(size) or REAL name(size)

commands to define the array. For integer arrays, use the INTEGER

name(size) command. All arrays have a lower bound of zero (option base 0).

Arrays do not have a default size. For example, to create a 10-element array,

specify a size of 9 as shown below.

OUTPUT 722; "DIM TESTER(9)"

Array names are subject to the same rules as numeric variable names. To

specify a particular array element, you must specify the subscript enclosed

in parentheses. The range of subscripts is an integer from 0 through 999, but

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