8 Frequency Scan Measurement
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limit files contained in the EMI measurement guide, HP E7415A.
.csv file format
Except for information in quotes, limit line files are not case sensitive. Information in bold is required
verbatim; other text is example text, and italic text is commentary which should not be present in the file.
The first five lines are system-required header lines, and must be in the correct order.
The next few lines describe the parameters; on export they will be in the order shown, on import they can
be in any order. If some parameters are missing, they will revert to the default.
The Amplitude Unit line in the limits file may contain an antenna factor unit, for example:
Amplitude Unit=dBuV/m
Antenna 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:
EMI Receiver Mode Reference 553
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