The following parameters are measured in the RF Measurement mode.
Channel Spectrum
Channel Spectrum displays the spectrum of the input signal across one channel. The Channel Power and Occupied BW are computed and displayed below the graph.
Channel Power
Channel power measures the average power within the selected bandwidth and is expressed in dBm or Watts.
Occupied BW
The measured occupied bandwidth is calculated as the bandwidth containing 99% of the total integrated power within the selected span around the selected center frequency.
ACLR
ACLR (Adjacent Channel Leakage Ratio) is defined as the ratio of the amount of leakage power in an adjacent channel to the total transmitted power in the main channel and is displayed in table format under the bar graph. The ACLR screen displays the main channel power and the power of two adjacent channels on each side as a bar graph. For example, when BW is set to 10 MHz, the channel spacing is – 20 MHz, – 10 MHz, + 10 MHz and + 20 MHz and the channels are color coded.
Spectral Emission Mask
The Spectral Emission Mask (SEM) measurement supports the testing for “Operating Band Unwanted Emissions” described in the 3GPP TS 36.141 Base Station Conformance testing document. There is support for Category A and Category B (Option 1 only) masks which are automatically selected based on the current carrier frequency/channel and BW values.
The instrument indicates if the signal is within the specified limits by displaying PASS or FAIL. The emission mask information is also displayed in a table format with different frequency ranges and whether the signal PASSED/FAILED in that region.
RF Summary
The RF Summary is a display of the occupied bandwidth, power of the main channel, upper adjacent channels, and lower adjacent channels in a table format. The RF Summary also shows the SEM status: PASS or FAIL. Refer to individual RF measurement descriptions for additional details on each measurement.
RF Measurement Setups
Channel Spectrum
1. Press the Measurements main menu key.
2. Press the RF submenu key.
3. Press the Channel Spectrum submenu key to activate this RF measurement view (Figure: Channel Spectrum).
4. Press the Channel Spectrum submenu key again to select the Channel Spectrum menu, where you can adjust the span.
Channel Spectrum
5. Press the Back submenu key to return to the RF menu.
4. Press the Back submenu key to return to the Measurements menu.
Spectral Emission Mask
1. Press the Measurements main menu key.
2. Press the RF submenu key.
3. Press the Spectral Emission Mask submenu key to activate the Spectral Emission measurement and display (Figure: Spectral Emission Mask).
4. Press the Spectral Emission Mask submenu key again to list the Spectral Emission menu and set up its parameters. Refer to Figure: LTE RF Menu for additional information.
5. To view the measurement data in a table format, press the Summary Table submenu key so On is underlined.
Spectral Emission Mask
6. Press the Back submenu key to return to the RF menu.
RF Summary
1. Press the Measurements main menu key.
2. Press the RF submenu key.
3. Press the RF Summary submenu key to activate and display the RF measurements in table format (Figure: RF Summary).
RF Summary
4. Press the Back submenu key to return to the Measurements menu.
