RIGOL DSA875 - Manual (Page 55)

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA800 Series 2-3
Center Freq
Set the center frequency of the current channel. Press this key to switch to center
frequency/span input mode. The center frequency and span values are 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. If one is changed, the others are updated to match.
 You can modify this parameter using the numeric keys, knob or direction keys.
Refer to “Parameter Setting” for more details.
Table 2-1 Center Frequency
Parameter Explanation
Default 3.75 GHz
Range* 0 Hz to 7.5 GHz
Unit GHz, MHz, kHz, Hz
Knob Step Span > 0, step = Span/200
Span = 0, step = RBW/100
Min = 1 Hz
Direction Key Step CF step
Note: *The range is from 50 Hz to (7.5 GHz-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. 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