CPRI RF Analyzerand BBU Emulator Measurement Guide : CPRI Analyzer : Amplitude Menu
 
Amplitude Menu
Key Sequence: Amplitude
Amplitude Menu
Settings under the Amplitude menu apply to the currently active display as indicated in the menu title (Display 1 or 2).
Reference Level
The reference level is the top grid line of the sweep window and can be set from +30 dB to –150 dB. Press this key, then use the arrow keys or the rotary knob to change the reference level value.
To enter a negative value with the numeric keypad, press the +/– key for a minus sign. After entering the value, press the dB submenu key or the Enter key to apply.
The reference level value may be modified by the reference level offset value to compensate for an external attenuator or amplifier.
Scale
The scale can be set in 1 dB steps from 1 dB per division to 15 dB per division. The value can be changed using the keypad, the rotary knob, or the arrow keys.
RL Offset
RL Offset compensates for the presence of external input attenuation or gain. It applies to Display 1 only, whether the display mode is single or dual. Press this key, then use the arrow keys or the rotary knob to change the offset value. You can also enter a value using the numeric keypad, then select dB External Gain or dB External Loss as appropriate.
Units of External Gain or Loss
Key Sequence: Amplitude > RL Offset > Keypad Entry
Units Menu for External Gain or Loss
These units are for RL Offset Gain or Loss.
dB External Gain
Enter a value with the numeric keypad, then press this submenu key for external gain. Use the +/– key for a negative value. Note that a negative external gain equates to an external loss.
dB External Loss
Enter a value with the numeric keypad, then press this submenu key for external loss. Use the +/– key for a negative value. A negative external loss equates to an external gain.



Backspace
Press this submenu key to delete the last digit entered.