SPA-900 Series User Manual 25
2.1 Basic Settings
2.1.1 Frequency
Set the frequency parameters and functions of the analyzer. Restart sweeping every time when the
frequency parameters are modified.
The frequency range of a channel can be expressed by either of three groups of parameters: Start
Frequency, Center Frequency and Stop Frequency. If any of the parameters is changed, The
others would be adjusted automatically in order to ensure the coupling relationship among them
start
stop
span
stop
start
center
f
f
f
)/2
f
(f
f
The
span
f
is span
2.1.1.1
Center Frequency
Set the center frequency of the current channel. The center frequency and span values are
displayed at the lower left and right sides of the grid respectively. In process of using pay attention
to the following points:
The start and stop frequencies vary with the center frequency when the span is constant
(except the Start Frequency and Stop Frequency to the border).
In Zero Span mode, the start frequency, stop frequency and center frequency are always the
same.
Table 2-1 Center Frequency
Parameter
Explanation
Default
Full Span/2
Range
Zero Span, 0 Hz ~ Full Span
Nonzero Span, 50 Hz ~ (Full Span -50Hz)
Unit
GHz\MHz\kHz\Hz
Knob Step
Span>0, step=Span/200
Span=0, step=RBW/100
Min 1 Hz
Direction Key Step
Freq step
Related to
Start Freq, Stop Freq
Distributed by: Reliant EMC LLC, +1 408 916
‐
5750, info@reliantemc.com, www.reliantemc.com
