User manual

User’s Guide for DSA800 Series
Chapter 2 Front Panel Operation RIGOL
2-9
SPAN
Set the span of the analyzer. The change of this parameter will affect the frequency
parameters and restart the sweep.
Span
Set the frequency range of the current channel. Press this key to switch to center
frequency/span input mode and the center frequency and span are displayed at
the lower left and right sides of the grid respectively.
Key Points:
 The start and stop frequencies vary with the span automatically.
 In manual span mode, the span can be set down to 100 Hz (the only way into
the zero-span mode is pressing the Zero Span menu option) and up to the
full span described in “Specifications”. When the span is set to the
maximum, the analyzer enters full span mode.
 Modifying the span in non-zero span mode may cause an automatic change in
both CF step and RBW if they are in Auto mode, and the change of RBW may
influence VBW (in Auto VBW mode).
 Variation in the span, RBW or VBW would cause a change in the sweep time.
 In non-zero span mode, neither “Video” trigger nor “1/Δtime” readout
function is valid.
 You can modify this parameter using the numeric keys, knob, or direction keys.
For more details, please refer to “Parameter Setting”.
Table 2-5 Span
Parameter
Explanation
Default
1.5 GHz
Range
*
0 Hz to 1.5 GHz
Unit
GHz, MHz, kHz, Hz
Knob Step
Span/200, Min = 1 Hz
Direction Key Step
in 1, 2, 5 sequence
*
Note: 0 Hz is available only in zero span.