Viavi CellAdvisor 5G, User Manual

Page: 54 / 359

Using Spectrum Analyzer
42
Setting amplitude
You can set the reference and attenuation levels automatically or manually to optimize the display of the traces measured.
Access : on the Quick access and display tab or Menu > Amp/Scale .
Amplitude
The following is the definition of each key function:
Parameter Definition
Reference Level
Sets the horizontal bar that can be placed at any graticule. Enter a value using the on-screen
keyboard.
Access : Menu > Amp/Scale > Reference Level
Attenuation
Tap to set the attenuation value using the on-screen keyboard.
Access : Menu > Amp/Scale > Attenuation
Attenuation
Auto/Couple/Manual
Tap to select the attenuation option from Auto , Couple , or Manual .
Auto to set the input attenuator's level automatically.
Manual to set the input attenuation manually up to 55 dB for the CellAdvisor 5G to optimize
S/N.
Couple to couple the input attenuator's level with your reference level setting.
Access : Menu > Amp/Scale > Attenuation/Manual
Scale Division
Allows you to use the Scale/Div feature available for the total harmonic distortion screen. It
represents the value of one division on the horizontal scale. The default setting is 10 dB per
division and the maximum value can be set up to 20 dB. Set the value using the on-screen
keyboard.
Access : Menu > Amp/Scale > Scale Division
Scale Unit
Tap to change the scale unit of the display scale: dBm , dBV , dBmV ,
dBμV
, V , or W .
Access : Menu > Amp/Scale > Scale Unit
Preamp 1 On/Off
Allows you to turn the internal pre-amplifier on to correct and compensate for the gain of the
preamp so that amplitude readings show the value at the input connector. It is the first Preamp
for the CellAdvisor 5G FR1 Band and operated when the input level is -50 dBm or below.
Access : Menu > Amp/Scale > Premap 1 On/Off
Preamp 2 On/Off
Allows you to turn the external pre-amplifier on to correct and compensate for the gain of the
preamp so that amplitude readings show the value at the input connector. It is the second
Preamp for the CellAdvisor 5G FR1 Band and operated when the input level is -70 dBm or
below.
Access : Menu > Amp/Scale > Premap 2 On/Off
DNC Preamp On/Off
Allows you to turn the external DNC pre-amplifier on to correct and compensate for the gain of
the preamp so that amplitude readings show the value at the input connector. It is a Preamp for
the CellAdvisor 5G FR2 Band and operated when the input level is -50 dBm or below.
Access : Menu > Amp/Scale > DNC Premap On/Off
External Offset Mode
On/Off
Tap to turn the external offset mode on or off.
Access : Menu > Amp/Scale > External Offset On/Off