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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:
Allows you to purge data from the limit-line tables. Pressing
Delete All
Limits
Limits
delete, will delete the limits.
Key Access:
Accesses the
Corrections
corrections function and to select which set of correction factors you
wish to modify.
Corrections are used for the gains and losses associated with the
addition of external devices such as antennas and amplifiers, while
making measurements. By applying Corrections, you can read the true
signal level (such as electric field strength) directly from the analyzer.
The unit conversions are automatically handled by the analyzer when
the appropriate correction factors are applied.
Example: Suppose that at a particular frequency, the analyzer
measures 113 dBµV. Use Corrections to account for the conversion loss
of the antenna (transferring a 377 ohm system to 50 ohm system), the
loss of the cable, and the gain of the amplifier.
Chapter 2
Meas Setup, More
after the prompt, If you are sure, press key again to
Meas Setup, More
menu keys which allow you to enable the
Corrections
,
Limits
,
Limits
Front-Panel Key Reference
Meas Setup
Delete
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