7 Save/Recall/Print
7.3 Save
The Amplitude Unit line in the limits file may contain a transducer (formerly
“antenna”) factor unit, for example:
Amplitude Unit=dBuV/m
Transducer factor units are dBuV/m, dBuA/m, dBpT, and dBG. In this case, the unit
is treated exactly as though it were dBuV, meaning that all of the limits are
interpreted to have units of dBuV. The box does NOT change Y Axis Units when such
a limit is loaded in.
The X-Axis unit also specifies the domain (time or frequency). It is not possible to
have both time-domain lines and frequency-domain lines at the same time; if a
time-domain line is imported while the other lines are in the frequency domain (or
vice-versa), all limit lines will be deleted prior to import.
If the sign of the margin is inappropriate for the limit type (for example a positive
margin for an upper limit), the sign of the margin will be changed internally so that it
is appropriate.
The remaining lines describe the data. Each line in the file represents an X-Y pair.
The X values should be monotonically non-decreasing, although adjacent lines in
the file can have the same X value as an aid to building a stair-stepped limit line. To
specify a region over which there is no limit, use +1000 dBm for upper limits or –
1000 dBm for lower limits.
The data region begins with the keyword DATA:
.lim file format
This is a legacy format which allows files saved from older instruments to be loaded
into the X-Series. Design of files in this format is not recommended.
Except for name and description text (which is taken verbatim), limit line files are not
case sensitive.
The file may optionally start with a description block, consisting of the single line
[DESCRIPTION] followed by arbitrary text. If there is no Limit Line Name header, the
2611 Spectrum Analyzer Mode User's &Programmer's Reference
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