Digital Mod. Power Level Accuracy Relative to CW

This test requires firmware revision C.05.82 or later.

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 external baseband generator. 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 test is performed with three different modulation formats: QPSK, GMSK, and WCDMA.

Required Test Equipment

Test Equipment

Critical Specifications for This Test

Recommended Models

Alternate Models

External Baseband Signal Generator

Used only if the UUT does not have a Baseband Generator Opt 001, 002, 601, or 602

N5182B Option 656 or 657

N5182A Opt 651, 652, or 654
N5172B Opt 653 or 655

E4438C Opt 001, 002, 601, or 602
E4430B Opt UN8, E4431B Opt UN8,
E4432B Opt UN8, E4433B Opt UN8,
E4434B Opt UN8, E4435B Opt UN8,
E4436B Opt UN8, E4437B Opt UN8

Power Sensor

None

N8482A

N8482A CFT
8482A H841
U8481A Option 200
U8485A Option 200

Power Meter

None

N1914B

N1914A2
N1913A
N1913B

E4418A
E4418B
E4419A
E4419B

  1. Option H84 provides reflection coefficient data.

  2. Power meter N1914A with serial numbers ranging between MY00000000—MY53040007 require Service Note 07 to be applied for measurement repeatability. Please have this service note applied or verify it was applied before using this power meter. The affected service note is N1914A-07.

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.

 

Flexible power sensor channel assignment

This test uses flexible power sensor channel assignment and will identify the channel that a power sensor is connected to using the ability of "smart" sensors such as the N848xA, U848xA, and E930xA series to report their full model and serial number. Legacy 848x series power sensors are unable to provide their model or serial number, but their channel is identified during the sensor calibration process by identifying the channel of the sensor connected to the calibrator.

If the wrong legacy power sensor is connected to the calibrator during this process the error can be resolved by disconnecting and reconnecting the power sensor to the power meter which will force a new calibration.

 

 

 

 

 

 

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. If this test fails with the equipment set up properly, refer to the troubleshooting section of the signal generator's 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 on the Keysight Website.

  3. If you cannot correct the problem using the troubleshooting procedures in the Service Guide, obtain service from Keysight Technologies. Refer to Contacting Keysight Technologies.