RIGOL
Chapter 2 Functions of the Front Panel
2-2
VNA User Guide
Basic Settings
FREQ
Sets the frequency parameters of the analyzer. Press
FREQ
on the front panel to
enter the frequency setting menu. You can also tap the function keypad at the top of
the screen to select FREQ. The analyzer sweeps within a specified frequency range
and restarts sweeping every time the frequency parameters are modified.
The frequency range of a channel can be expressed by either of two groups of
parameters: Start Frequency/Stop Frequency (
start
f
/
stop
f
); or Center
Frequency/Span (
center
f
/
span
f
). If any of the four parameters is changed, the other
three parameters will make adjustment automatically to ensure the coupling
relationship among them:
2
)
(
start
stop
center
f
f
f
+
=
(2-1)
start
stop
span
f
f
f
−
=
(2-2)
In this menu, Center Frequency is, by default, selected.
Center Freq
Sets the center frequency of the current channel.
Remarks:
⚫
When you modify the center frequency, the start and stop frequency will be
modified automatically if the span remains to be unchanged.
⚫
Modifying the center frequency indicates that the frequency is changed along
the current channel horizontally, and the adjustable range should be within the
frequency range specified in the technical specifications of the analyzer.
Table 2-1 Center Frequency
Parameter
Remarks
Default
(Fstart
[1]
+ Fstop
[2]
)/2
Range
(100 kHz + 5 Hz ) to (Fmax
[3]
–
5 Hz)
Unit
GHz, MHz, kHz, Hz
Knob Step
step = span/200, Min = 1 Hz
Left/Right Arrow Key Step
Up/Down Arrow Key Step
CF step
Note
[1]
:
Fstart is the start frequency.
Note
[2]
:
Fstop is the stop frequency.
Note
[3]
:
The maximum measurement frequency Fmax is determined by the instrument model. For
RSA5065N, Fmax is 6.5 GHz; for RSA5032N, Fmax is 3.2 GHz; for RSA3045N, Fmax is 4.5 GHz; for
RSA3030N, Fmax is 3 GHz; for RSA3015N, Fmax is 1.5 GHz.
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