Keysight E4990A - Parameter Description

E4990A Help
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Data structure of the Touchstone file consists of a header part and a data
part. The contents of the file is text data, which is ready to be read with a
general text editor.
The header part consists of the returned value of *IDN?, file created date,
calibration state, list of all S parameters of a specified port, and format
information.
The header parts of s1p are shown below.
Header of s1p
!Agilent Technologies,E4990A,<ID>,<FW Revision>
!Date <Date>
!Data:
!Freq S11
# Hz S FMT R 50
The option line starting with "#" is placed at the beginning of the file. The
structure of the option line is as follows:
Parameter Description
Hz
Indicates the frequency unit. For the E4990A, it is fixed
to Hz.
S
Specifies the type of parameters in data lines. For the
E4990A, "S" is specified that indicates the S parameter.
FMT
Specifies the format. This can be changed by the
selection.
RI = Real number - imaginary number
MA = Linear magnitude - angle
DB = Log magnitude - angle
R 50
Specifies the characteristic impedance. For the E4990A
specified is "R 50", meaning 50 .
The following figures show the data structures of files saved in Touchstone
format.
1-port Touchstone file
Restrictions when saving data in Touchstone format