SNA5000A Vector Network Analyzer User Manual 140
same value.
6.3.1.3
Center Frequency
Set the center frequency of the current sweep. The center frequency and span values are
displayed at the bottom of the grid respectively.
● Modifying the center frequency will modify both the start frequency and stop frequency
when the span is constant (except when the start frequency or stop frequency reaches the
boundary).
● In Zero Span, the start frequency, stop frequency and center frequency are always the
same value.
6.3.1.4
Span
Set the span of the analyzer. Any change of this parameter will affect the frequency parameters
and restart the sweep.
Set the frequency range of the current sweep. Pay attention to the following points during use:
●
The start and stop frequency vary with the span when the center frequency is constant.
● the span can be set down to 100 Hz and up to the maximum bandwidth.
● Modifying the span in non-zero span mode may cause an automatic change in both Freq
Step and RBW if they are in Auto mode. Besides, the change of RBW may influence VBW
(in Auto VBW mode).
● Variation in the span, RBW or VBW would cause a change in the sweep time.
6.3.1.5
Sweep Points
The number of points is the number of data items collected in one sweep.
The more scanning points, the more accurate the measurement results, but the longer the
scanning time. The less scanning points, the shorter the scanning time, can get the
measurement results faster.
6.3.1.6
Image Reject Type
The signal is mixed with the local oscillator to get an intermediate frequency signal, and the
mixer may produce a mirrored frequency signal. Therefore, it is necessary to change the local
oscillator or intermediate frequency to collect multiple groups of spectral data, and filter out the
image through the image suppression algorithm.
None
:
Selects 1 acquisitions, and mirror suppression is not performed.
Normal
:
Selects 4 acquisitions.
Summary of Contents for SNA5000A Series
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