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3.1 Basic Settings
3.1.1 FREQ
Set the frequency parameters of the analyzer. The analyzer sweeps within a specified frequency
range, and the sweep is restarted every time you change the frequency parameters.
The frequency range of a channel can be expressed by either of two groups of parameters: Start
Frequency and Stop Frequency(
parameters is changed, the others would be adjusted automatically in order to ensure the
coupling relationship among them:
(
f
f
f
=
center
+
stop
start
f
f
f
-
span
stop
start
=
Center Freq
Set the center frequency of the current channel. Press this key to switch to center frequency input
mode and the center frequency is displayed at the lower left and right sides of the grid
respectively.
Key Points:
•
The start and stop frequencies vary with the center frequency when the span is constant.
•
Changing the center frequency horizontally shifts the current channel and the adjustment is
limited by the specified frequency range.
•
In Zero Span mode, the start frequency, stop frequency and center frequency are always
the same.
•
You can modify this parameter using the numeric keys, knob or direction keys. Refer to
"Parameter Setting" for more details.
Center Frequency
Parameter
Default
Range*
Unit
Knob Step
Direction Key Step
*Note: The range is from 50 Hz to [1.6GHz (1.6GHz)-50 Hz] in non-zero span.
Start Freq
Set the start frequency of the current channel. Press this key to switch to start/stop frequency
input mode and the start and stop frequencies are displayed at the lower left and right sides of the
grid respectively.
Key Points:
•
The span and center frequency vary with the start frequency. The change of span would
affect other system parameters. For more details, please refer to "Span".
f
f
/
); or Center Frequency and Span(
start
stop
)
/ 2
Explanation
1.6GHz (1.6GHz)
0 Hz to 1.6GHz (1.6GHz)
GHz, MHz, kHz, Hz
Span > 0, step = Span/200 Span = 0, step = RBW/100 Min = 1
Hz
CF step
f
f
/
). If any of the
center
span
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