Press the Amplitude main menu key to display the Amplitude menu.
Setting Amplitude Reference Level and Scale
Spectrum Analyzer and Interference Analysis Modes
Note
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
Note
This setting applies to most demodulator modes of instrument operation. The Spectrum Analyzer and Cable and Antenna Analyzer modes have no equivalent to Auto Range. For other analyzer modes, consult the individual measurement guides. Refer to Measurement Guides.
1. Press the Adjust Range submenu key to set an optimal reference level based on the measured signal.
Note
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.
Power Offset Set Up for Compensating External Loss
To obtain accurate results, compensate for any external attenuation by using power offset. In power offset mode, the compensation factor is in dB. (External attenuation can be created by using an external cable or an external high power attenuator.)
Press the Power Offset submenu key and use the keypad, the arrow keys, or the rotary knob to enter the desired offset value. When using the rotary knob, the value changes in increments of 0.1 dB. Using the Left/Right arrow keys changes the value in increments of 1.0 dB. When using the Up/Down arrow keys, the value changes in increments of 10.0 dB. When using the keypad, enter the new value then press Enter or the dB submenu key to set the value. The power offset is displayed in the instrument settings summary column on the left side of the measurement display.