Adjacent Channel Power

(N5166B / N5172B Option 653 or 655 or 657, and N5182B / N5182N Option 656 or 657 Only)

Adjacent Channel Power Ratio (ACPR) is the ratio of the power in a specified bandwidth within an adjacent, offset channel to the average power level in the main channel.

Alternate Channel Leakage Ratio (ACLR) is the ratio of the power in a specified bandwidth within a channel that is two offsets away from the main channel to the average power level in the main channel.

For this test, the DUT generates a W-CDMA and LTE-FDD waveforms. Then the ACPR and ACLR are measured directly with a spectrum analyzer.

Required Test Equipment

Test Equipment

Critical Specifications for This Test

Recommended Model

Alternate Models

Spectrum Analyzer

Noise Floor </= (–91 dBm)

N9030B Opt 5xx1

N9030A Opt 5xx1
E444xA2
  1. Select any option of PXA spectrum analyzer (503, 508, 513, 526, 543, 544, 550) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test. The N9030A/B Option 550 frequency range is adequate for all DUT frequency configurations.
  2. Select any model of PSA spectrum analyzer (E4440A, E4443A, E4445A, E4446A, E4447A, E4448A) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test. The E4448A frequency range is adequate for all DUT frequency configurations.

Connections and Setup Procedures
  • All test equipment requires a 30 minute warmup period to ensure accurate performance.
  • In the following test setup, cables are designated as solid lines and direct connections are designated as dashed lines.
  1. Connect all test equipment as shown.
  2. Connect GPIB cables to all GPIB-controlled test equipment.
  3. While performing this test, follow all instructions on the controller display.

 

Test Setup

In Case of Difficulty

If this performance test fails, perform the following steps in order:

  1. Check the equipment setup (see above). If the setup is incorrect, make the necessary corrections and rerun the performance test.

  2. Refer to the troubleshooting section of the service guide. If you do not have a printed copy of the service guide (Option OBW), one is available either on the CD-ROM that came with your signal generator shipment or search for your signal generator model number on the Keysight website.

  3. If necessary, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.