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2-3
Subsystem Commands
Chapter 2 — Programming with SCPI
Identifiers
The following identifiers have been used throughout the optional command definitions.
Descriptions are provided here. In most cases, units are specified with the individual
command.
Table 2-3.
Description of Command Identifiers
Identifier
Description
<amplitude>
Amplitude value. Units specified with the command.
<freq>
Frequency. Units specified with the command.
<integer>
Integer value, no units. Range specified with the command.
<number>
Numeric value, integer, or real.
<percentage>
Percentage value from 0 to 00. Units are always %.
<rel ampl>
Relative amplitude. Units are always dB.
<x-parameter>
Parameter value in the units of the x-axis. Units are specified with the
command.
<string>
The string should be enclosed in either single quotes (‘ ’) or double quotes
(“ ”).
<file name>
The name should be enclosed in either single quotes (‘ ’) or double quotes
(“ ”). The need for an extension is documented with applicable commands.
<voltage>
Voltage. Units specified with the command.
<current>
Current. Units specified with the command.
Data Parameters
Data parameters, referred to simply as “parameters”, are the quantitative values that are
used as arguments for the command keywords. The parameter type that is associated with a
particular SCPI command is determined by the type of information required to control the
particular instrument function. For example, Boolean (ON | OFF) type parameters are used
with commands that control switch functions.
Some command descriptions specify the type of data parameter to be used with each
command. The most commonly used parameter types are numeric, extended numeric,
discrete, and Boolean.
Numeric
Numeric parameters comprise integer numbers or any number in decimal or scientific
notation, and may include polarity signs.
Discrete
Discrete parameters, such as INTernal and EXTernal, are used to control program
settings to a predetermined finite value or condition.
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PN: 10580-00403 Rev. C
MW82119B PM