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Freq Offset: Set a frequency offset to explain the frequency conversion between the device under test
and the import of spectrum analyzer. Use numeric key, rotary knob, direction key or touch panel menu to
change the frequency offset.
Note
This parameter will not affect the hardware setting of spectrum analyzer, only change the display
value of the center frequency, start and stop frequency.
Set the frequency shift to 0Hz to eliminate the frequency offset.
Full Span: Change the sweep span to display full frequency range.
Zero Span: Set the sweep span to zero. This mode displays the envelope of the time domain signal (the
X-axis is displayed in time unit). Like an oscilloscope.
Note
In zero span, it displays the time-domain characteristic of fixed frequency component of the signal. There
are many differences from the non-zero span mode.
The following function are not invalid in zero span mode:
Marker in [Marker] menu（except ->ref level）;
Sweep time and sweep mode in [Sweep].
Zoom Out : Set the sweep span to double of the current sweep span, for observing more signals.
Zoom In: Set the sweep span to a half of the current sweep span, for observing the details of signal.
Last Span: Set the sweep span as the last modified sweep span.
CF Step: Set the stepped frequency will cause the change of center frequency, start and stop frequency.
Use numeric key, rotary knob, direction key or touch panel menu to change the stepped frequency.
Auto Tune: Quick to find the signal that is most likely to be interest and place it optimally on the display.
AMPT
Press [AMPT] key to enable reference level and enter amplitude setting menu.
Ref Level: Set reference level, press [AMPT] key to enable this function. Reference level is the
power or voltage value on the top grid of the screen (Unit is the selected amplitude unit). Use numeric
key, rotary knob, direction key or touch panel menu to change the reference level.
Note
Reference level is the important parameter of spectrum analyzer, it presents the upper limit of
dynamic range of the spectrum analyzer at the current. When the energy of the signal to be
measured exceeds the reference level, it may cause non-linear distortion or even overload alarms.
The nature of the signal to be measured should be understood and carefully select reference level,
in order to perform the best measurement effect and protect the spectrum analyzer.
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