Agilent Technologies ESG Especificações descarregar pdf (Página 42)

1-38 Programming Guide

Preparing for Use ESG Family Signal Generators

Getting Started with SCPI

Each parameter type has one or more corresponding response data types. For example, a

setting that you program using a numeric parameter returns either real or integer

response data when queried. Whether real or integer response data is returned depends on

the instrument used. However, precise talking requires that the response data type be

clearly defined for a particular instrument and query. Chapter 2 contains information

about data types for individual commands.

Parameter Types

Numeric Parameters Numeric parameters are used in both subsystem commands and

common commands. Numeric parameters accept all commonly used decimal

representations of numbers including optional signs, decimal points, and scientific

notation.

If an instrument setting programmed with a numeric parameter can only assume a finite

number of values, the instrument automatically rounds the parameter. For example, if an

instrument has a programmable output impedance of 50 or 75 ohms, and you specified

76.1 for output impedance, the value is rounded to 75. If the instrument setting can only

assume integer values, it automatically rounds the value to an integer. For example

sending *ESE 10.123 is the same as sending *ESE 10.

Examples of numeric parameters:

Extended Numeric Parameters Most subsystems use extended numeric parameters to

specify physical quantities. Extended numeric parameters accept all numeric parameter

values and other special values as well. All extended numeric parameters accept MAXimum

and MINimum as values. Other special values, such as UP and DOWN may be available as

documented in Chapter 2. Notice that MINimum and MAXimum can be used to set or query

values. The query forms are useful for determining the range of values allowed for a given

parameter.

In some instruments, extended numeric parameters accept engineering unit suffixes as

part of the parameter value.

Notice that extended numeric parameters are not used for common commands or STATus

subsystem commands.

100 no decimal point required

100. fractional digits optional

−1.23 leading signs allowed

4.56e<space>3 space allowed after e in exponential

−7.89E−01 use either E or e in exponential

+256 leading + allowed

.5 digits left of decimal point optional

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Agilent Technologies ESG Especificações Página 42