Datasheet
Key points:
When Signal Track is on, the ST icon is shown at the left of screen.
If an active marker exsits, when Signal Track is on, the analyzer will search and mark the point
(with no more than 3dB variation in amplitude) near the marker, set the frequency of this point
as center frequency and hold the signal at the center of screen.
If no marker is active, when Signal Track is on, Marker 1 is enalbled and executes a peak
searching, set the current peak frequency as center frequency and hold the signal at the center
of the screen.
In continouse sweep, the system tracks continuously. In single sweep, only track one signal. In
zero span, Signal Track is invalid.
4. SPAN
Set the span of analyzer. The frequency parameter varies with the span. Once change the span,
sweep will be restarted.
4.1. Span
Set the frequency range of current channel. When pressed, the frequency mode is switched to
Center Freq/Span for input, and the Center Freq and Span are shown at the lower left and right of
the display grid.
Key points:
The Start/Stop Frequency varies with the changing of Span automatically.
In manual span mode, the minimum can be set as 100Hz (the only way to zero span is to press
the Zero Span menu option), the maximum is described in “Specification”, analyzer enter into
full span mode when select maximum setting.
In non-zero span mode, CF step and RBW changes with the span when they are Auto mode,
and changing of RBW will influence VBW (in Auto mode).
Any changes among Span, RBW and VBW will influence Sweep Time.
In non-zero span mode, some functions are invalid, like “Video” trigger, “1/△time” readout.
You can modify this parameter by numeric keys, knob and arrow keys.
Table 2-5 Span
* Note: 0 Hz is only available in zero span.
-15-
Parameter
Description
Default
1.5 GHz (P4130-1)
2.2 GHz (P4135-1)
3.0 GHz (P4140-1)
Range*
0Hz ~ 1.5GHz (P4130-1)
0Hz ~ 2.2GHz (P4135-1)
0Hz ~ 3.0GHz (P4140-1)
Unit
GHz, MHz, kHz, Hz
Knob Step
span/200, Min=1 Hz
Arrow Keys Step
In 1-2-5 sequence