7 Save/Recall/Print
7.3 Save
description text will be used as the limit line description in the GUI. If there is a Limit
Line Name header, the Limit Line Name will be used instead.
Arbitrary text
The header block begins with the single line [HEADER], followed by some or all of
the following fields, each with <parameter name>=<parameter value>. Excess
white space around the “=” is ignored. If a field is not present or the data is invalid,
the value is not changed when the limit line is loaded. Ordering of the fields is
unimportant.
Limit Line Name=“FCC Part 15;Class B
Radiated”
Type=Upper Upper|Lower
Frequency Unit=MHz For time domain limits, this should say “Time Unit”
Amplitude Unit=dBm
Frequency Interpolation=Lin Log|Lin; on input we consider only the first three
characters
Amplitude Interpolation=Log Log|Lin; on input we consider only the first three
characters
Mode=Fixed Fixed|Relative
Margin=0 Always in dB. A 0 margin is equivalent to margin off
Domain=Frequency Frequency|Time
Delimiter=TAB
The data block begins with the line [DATA], and consists of any number of
segments.
The Data lines represent segments – X1, Y1, X2, Y2. If the list of segments includes a
gap in the middle on input, the space inside the gap will be set to ensure the limit
does not fail: for upper limits maxtracevalue, for lower limits mintracevalue. If two
segments overlap on input, the stricter of the two segments is used – for upper
limits the lower segment, for lower limits the upper segment.
Thus, the following segments indicate into a –5 dB limit from 10 MHz to 20 MHz and
30 MHz to 40MHz:
10 –5 20 –5
30 –5 40 –5
If this was an upper limit, this would be translated into the following set of limit
points:
10 –5
20 –5
20 maxtracevalue
Spectrum Analyzer Mode User's &Programmer's Reference 2612
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