Digital Mod. Level Accuracy

This test compares the digital modulation power level to the CW power level at the same frequency. If the UUT is not equipped with an internal digital baseband generator, then its external I/Q inputs are driven by an E443xB or E4438C. A power meter and power sensor are used to measure the UUT output power in CW mode and in digital-modulation mode. The difference between the two power levels is compared to the specifications.

The power sensor supported by this test is the 8482A.

The test is performed with two different modulation formats: QPSK and GMSK.

Instrument

Critical Specifications for This Test

Recommended Model

Power Sensor

none

8482A

Baseband Generator

Used when ESG doesn't have an internal BBG.

E443xB Opt UN8 or
E4438C Opt 001/601 or 002/602

Power Meter

none

E4418A, E4418B, E4419A or E4419B

Attenuator

none

8491A Opt 010

 

Connections and Setup Procedures

All test equipment requires a 30 minute warm-up period to ensure accurate performance.

In the following test setup, direct cable and adapter connections are designated as solid lines. Changeable cable and adapter connections are designated as dashed lines.

 

Connect all test equipment as shown.

  1. Connect GPIB cables to all GPIB-controlled test equipment.

  2. While performing this test, follow all instructions on the controller display.
     

Setup for DUT with an internal baseband generator

Setup for DUT with an Internal baseband generator

Setup for DUT without an internal baseband generator