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Persistence View
Tap a button to change setting or to open the submenu.
Ref. Level / Attenuator
Lmax
Lrange
Fcent/Fspan, Fstart/Fstop
RBW / EBW
Meas. Time
Config
Display
Demod.
Setting the reference level / attenuation value
(Ref. Level / Attenuator)
Here you can do the following:
• Set the Reference Level (RL) or Attenuator value.
• Select the RF input
• Select +5 dB / -5 dB
• Switch Preamp On / Off
• Switch Ext. Device On / Off
Select Unit
•
The Reference Level is an indirect way to set the current attenuator value. It defines the
maximum measurable level. For better convenience it also sets the upper axis limit of the
view.
You can stop this coupling by setting the entry mode to Abs.in the Display settings:
1. Tap the header of the desired view.
2. Tap the Display button.
3. Tap the Freq. Axis button and switch between Abs. and Rel..
4. Press the Esc key twice to close the menus.
Background information about the Reference Level
The sensitivity of the system depends on the input attenuator setting. This setting is
determined by the Reference Level (RL) parameter. High measurement sensitivity avoids
falsification of the results due to noise generated internally by the device. On the other
hand, it is important that the device is not overloaded (saturated). Saturation can also be
caused by signals outside the frequency band, e.g. high power radio transmitters when
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