Press the Amplitude main menu key to display the Amplitude menu.
Setting Amplitude Reference Level and Scale
Spectrum Analyzer and Interference Analysis Modes
To change the current measurement units, press the Units submenu key and select the required units from the submenu keys that are presented. Press the Back submenu key to return to the Amplitude menu.
1. Press the Reference Level submenu key and use the Up/Down arrow keys or the keypad to change the reference level. Press Enter to set the reference level value.
2. Press the Scale submenu key and use the Up/Down arrow keys or the keypad to enter the desired scale. Press Enter to set the scale value.
Note
The Scale parameter cannot be changed when linear units are selected (Watts or Volts).
Press the Amplitude submenu key and select Auto Atten coupling of the attenuator setting and the reference level to help ensure that harmonics and spurs are not introduced into the measurements. Attenuator Functions are described in the Spectrum Analyzer Measurement Guide.
Setting Amplitude Range and Scale
This setting applies to most demodulator modes of instrument operation. The Spectrum Analyzer mode has no equivalent to Auto Range. For other analyzer modes, consult the individual measurement guides. Refer to Related Documents.
1. Press the Adjust Range submenu key to set an optimal reference level based on the measured signal.
To have the instrument continually set the optimal reference level, press the Auto Range submenu key so that On is selected.
2. Press the Scale submenu key.
3. Enter the desired scale units by using the keypad, the Arrow keys, or the rotary knob. Press the Enter key to set. The y‑axis scale is automatically renumbered.
Reference Level Offset for External Loss or External Gain
To obtain accurate measurements, compensate for any external attenuation or gain by using the RL Offset submenu. The compensation factor is in dB. External attenuation can be created by using an external cable or an external high power attenuator, external gain is typically from an amplifier.
To adjust the reference level for either gain or loss, press the RL Offset submenu key and enter a positive dB value and then press the appropriate submenu key (dB External Gain or dB External Loss). The new RL Offset value will be displayed on the instrument and reference level is adjusted.