SPA-900 Series User Manual 29
2.1.1.6
CF -> Step
Set the current center frequency as the CF step. At this point, the CF step will switch to “
Manual
”
mode automatically. This function is usually used with channel switching. Take harmonic
waveform measurement for example: locate a signal at the center frequency of a channel,
execute CF->Step and then press the down direction key continuously to measure each order of
harmonic in sequence
2.1.2 Span
Set the span of the analyzer. The change of this parameter will affect the frequency parameters
and restart the sweep.
2.1.2.1
Span
Set the frequency range of the current channel. The center frequency and span are displayed at
the low left and right sides of the grid respectively. In process of using pay attention to the
following points
：
The start and stop frequency vary with the span when the center frequency is constant.
In manual span mode. The span can be set down to 100Hz 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. Besides, the charge 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 is “
Video
” trigger nor “
1/
△
time
” readout function 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
Maximum bandwidth
Range
0 Hz~ 3.2GHz
Unit
GHz, MHz, kHz, Hz
Knob Step
Span/200, Min = 1 Hz
Direction Key Step
In 1-2-5 sequence
Related to
Start Freq, Stop Freq, Freq Step, RBW,
Sweep time
Note: 0 Hz is available only in zero span.
Distributed by: Reliant EMC LLC, +1 408 916
‐
5750, info@reliantemc.com, www.reliantemc.com
