Using Limit Lines and Display Lines – LINES Key R&S FSL
1300.2519.12 4.120 E-11
2. To display only the limit lines that are compatible, activate the Show compatible option. For details
o
n compatibility refer to "Limit Lines" on page 4.123.
3. To navigate into a subdirectory, use the Show Directory and Hide Directory buttons.
To create a new limit line
1. Press the New softkey to define a new limit line.
The Edit Limit Line dialog box is displayed. For more details on limit lines refer also to "Limit Lines"
on page 4.123.
2. Press the Edit Name softkey and enter a name, if you want to save the limit line in the main
directory. To save the limit line in an existing subdirectory, enter the relative path. A new
subdirectory can only be created using the FILE key (for details refer to section "Instrument
Functions – Basic Settings", "Saving and Recalling Settings Files – FILE Key".
3. To change the span setting, set the focus in the X–Axis field and change the unit via the rotary
knob: Hz for span > 0 Hz or s for zero span.
4. To change between absolute and relative scale mode for the x–axis, set the focus on the abs or rel
option next to the X–Axis field and press the CHECKMARK key. Relative scaling is always
suitable, if masks for bursts are to be defined in zero span, or if masks for modulated signals are
required for span > 0 Hz.
absolute: The frequencies or times are interpreted as absolute physical units.
relative: In the data point table, the frequencies are referred to the currently set center
frequency. In the zero span mode, the left boundary of the diagram constitutes the
reference.
5. To change the scaling of the y–axis, set the focus in the Y–Axis field and change the unit using the
rotary knob.
6. To change between absolute and relative units for the y–axis, set the focus on the abs or rel option
next to the Y–Axis field and press the CHECKMARK key.
absolute: The limit values refer to absolute levels or voltages.
relative: The limit values refer to the reference level (Ref Level). Limit values with the unit dB
are always relative values.
7. To define the limit line as upper or lower limit line, set the focus on the Upper or Lower option and
press the CHECKMARK key.
8. To change between linear or logarithmic scale of the x–axis, set the focus on the lin or log option
and press the CHECKMARK key.
9. If the scaling of the y–axis is relative, you can define an absolute threshold value that works as a
lower limit for the relative limit values (see figure below). Set the focus in the Threshold field and
enter a value.
The function is especially useful for mobile radio applications provided the limit values are defined
in relation to the carrier power as long as they are above an absolute limit value.
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