Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 434 / 813

Special Terms and Notation R&S
®
ZVA/ZVB/ZVT
1145.1084.12 5.2 E-1
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NAN (Not A Number) is generally used to represent missing data, e.g. if a portion of a trace has
not been acquired yet. It is also returned after invalid mathematical operations such as division
by zero. As defined in the SCPI standard, NAN is represented as 9.91 E 37.
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INV (invalid) is returned e.g. if a limit check is performed without defining the appropriate
tolerance values.
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Upper/lower case
Upper/lower case characters characterize the long and short form of the mnemonics in a
command. The short form consists of all upper-case characters, the long form of all upper case
plus all lower case characters. On the ZVT, either the short form or the long form are allowed;
mixed forms will generally not be recognized. Either the short form or the long form are
permissible. The instrument itself does not distinguish upper case and lower case characters.
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S pecial characters
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| A vertical stroke in the parameter list characterizes alternative parameter settings. Only one of
the parameters separated by | must be selected.
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Example: The following command has two alternative settings:
FORMat[:DATA] ASCii | REAL
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[ ] Key words in square brackets can be omitted when composing the command header (see
SCPI Command Structure and Syntax ). The complete command must be recognized by the
instrument for reasons of compatibility with the SCPI standard. Parameters in square brackets
are optional as well. They may be entered in the command or omitted.
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{ } Braces or curly brackets enclose one or more parameters that may be included zero or
more times.
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Numeric suffixes
Symbols in angular brackets ( <Ch>, <Ch/Tr>, <Mk>,... ) denote numeric suffixes. Numeric
suffixes are replaced by integer numbers to distinguish various items of the same type. The
analyzer provides numeric suffixes for channels, traces, ports, markers etc. If unspecified, a
numeric suffix is replaced by 1.
The marker suffix must be in the range between 1 and 10, the number of ports depends on the
analyzer model. No restrictions apply to channel, trace, and diagram area suffixes.
In remote control, one active trace can be selected for each channel; see Active Traces in
Remote Control . This concept simplifies the remote control command syntax, because it allows
the active trace in a particular channel to be referenced by means of the channel suffix. To
keep the syntax transparent, <Ch> is used for channel settings (it denotes the configured
channel), whereas <Ch/Tr> is used for trace settings (it denotes the active trace in the
channel).