User manual

Chapter 2 Functions of the Front Panel of GPSA RIGOL
RSA3000 User's Guide 2-3
Center Freq
Sets the center frequency (that corresponds to the horizontal center of the graticule)
of the current channel. Press this key or touch the specified menu item on the screen
to set the frequency entry mode to Center Frequency/Span. The center frequency
and span values are respectively displayed at the lower left and right side of the
graticule.
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.
 In zero span mode, the values of start frequency, stop frequency, and center
frequency are the same, so once one of the parameter values is modified, the
other two values will be modified automatically.
 You can use the numeric keys, the knob, and the arrow keys on the front panel
to modify this parameter; also you can modify it on the touchscreen. For details,
refer to descriptions in "Parameter Setting".
Table 2-1 Center Frequency
Parameter
Remarks
Default
Fmax
[1]
/2
Range
(Smin/2)
[2]
to (Fmax - Smin/2)
Unit
GHz, MHz, kHz, Hz
Knob Step
span > 0, step = span/200
span = 0, step = RBW/100
Min = 1 Hz
Left/Right Arrow Key Step
Up/Down Arrow Key Step
CF step
Note
[1]
: Fmax (maximum measurement frequency) is determined by the model of the spectrum
analyzer. RSA3000 includes two models: 3 GHz and 4.5 GHz
Note
[2]
: Smin indicates the minimum span in non-zero span.