6-20 Chapter6
Front-Panel Key Reference
Display
Limits Fixed Rel
Allows you to choose fixed or relative limit lines. The
fixed (
Fixed) type uses the current limit line as a
reference with fixed frequency and amplitude values.
The relative (
Rel) setting causes the current limit line
value to be relative to the displayed center frequency
and reference level amplitude values. When limit lines
are specified with time, rather than frequency, the
Rel
setting only affects the amplitude values. The current
amplitude values will be relative to the displayed
reference level amplitude, but the time values will
always start at the left edge of the graticule.
As an example, assume you have a frequency limit line.
If the limit line is specified as fixed, entering a limit
line segment with a frequency coordinate of 300 MHz
displays the limit line segment at 300 MHz. If the same
limit line table is specified as relative, it is displayed
relative to the analyzer center frequency and reference
level. If the center frequency is at 1.0 GHz, a relative
limit line segment with a frequency coordinate of
300 MHz will display the limit line segment at 1.3 GHz.
If the amplitude component of the relative limit line
segment is –10 dB, then −10 dB is added to the
reference level value to obtain the amplitude of the
given segment (reference level offset included).
A limit line entered as fixed may be changed to relative,
and one entered as relative may be changed to fixed.
When changing between fixed and relative limit lines,
the frequency and amplitude values in the limit line
table change so that the limit line remains in the same
position for the current frequency and amplitude
settings of the analyzer. If a time and amplitude limit
line is used, the amplitude values change but the time
values remain the same. Key Access:
Display, Limits,
Properties
Delete Limits Allows you to purge data from the limit-line tables.
Pressing
Delete Limits after the prompt, If you are
sure, press key again to delete, will delete the
limits.
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