10-8
Disk Commands
SPARameter:SAVE
NOTE For .gif and .tif file formats, this instrument uses LZW compression/decompression licensed under U.S. patent
No 4,558,302 and foreign counterparts. End user should not modify, copy, or distribute LZW compression/
decompression capability. For .jpg file format, this instrument uses the .jpg software written by the Independent
JPEG Group.
The <area> argument selects which data from the screen is to be saved to disk: {SCReen |
GRATicule}. When you select GRATicule, only the graticule area of the display screen is
saved; the entire screen is saved if you select the default setting SCReen.
The <image> argument specifies the color scheme used during the screen save operation:
{NORMal | INVert | MONochrome}. The default value is INVert which saves the waveforms
over a white background.
SPARameter:SAVE
Command :DISK:SPARameter:SAVE <source>,"<file_name>"[,<format>[,<field>]]
Saves an S-parameter waveform to ASCII Touchstone files and text files. Before you can save
S-parameter data to a file, you must first display the S-parameter graph using the command
“TDRSparam” on page 19-3. For one-port single-ended devices, save your data (S11 or S22)
to Touchstone (.s1p) files. For two-port single-ended devices, save your data (S11, S21, S22,
S12) to Touchstone (.s2p) files. When saving multiple S-parameters to an s2p file, you must
save each S-parameter as a separate save, appending each S-parameter data to the original
file. The <field> argument selects the S-parameter for each appended save. Differential and
common mode S-parameter measurements can not be saved to Touchstone files. Any single
S-parameter (single-ended, differential mode, or common mode) can be saved to a text file
that uses the identical format as the Touchstone s1p file. While Touchstone files can not be
imported back into the 86100C, you can import them into circuit simulators for further analy-
sis.
The <source> argument can be CHANnel<n>, FUNCtion<n>, RESPonse<n>, or WMEM-
ory<n>. The <file_name> argument is the name of the file, with a maximum of 254 characters
(including the path name, if used). The file name assumes the present working directory if a
path does not precede the file name. The <format> argument can be TEXT (.txt), S1P
(Touchstone .s1p), or S2P (Touchstone .s2p). The default file format is TEXT. Use the
optional <field> argument when saving Touchstone S2P files to indicate the S-parameter
(S11, S21, S22, S12) being saved. Each of these S-parameters is assigned a fixed field in the
Touchstone file as listed in Table 10-1 on page 10-8.
Table 10-1. S-Parameters and Corresponding <field> Argument for s2p Files
S-Parameter
<field>
Argument
S11 1
S21 2
S12 3
S22 4
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