Low Band Digital Prelevel Calibration

(E8267D Only)

Use this calibration to optimally set the prelevel reference DAC on the output board for use in the digital mode of operation.

The prelevel reference DAC on the output board is used to control the RF power level that is incident upon the I/Q modulator. It does this by setting the control point for the prelevel loop. The loop has a detector on an output of the I/Q modulator. Its drive circuitry is also on the output board, but the RF modulator that it controls is on the Frac-N/synthesizer board. The goal of this calibration is to have sufficient power available at the I/Q modulator to perform the desired modulation—and have enough DUT output power available—while minimizing intermodulation distortion when digital modulation is in use.

Test Equipment

Preferred Model

Alternate Model(s)

Power Meter

N1914A1

E4419B
E4419A

Power Sensor

E9304A Opt H19

E9304A
E9304A Opt H18
  1. 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 Service Note

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 adjustment, follow all instructions on the controller display.

 

Setup for Power Meter Calibration

Setup for Low Band Digital Prelevel Calibration

 

In Case of Difficulty

If this adjustment fails, perform the following steps in order:

  1. Verify that the GPIB cable is connected between the controller and the signal generator being calibrated and rerun the adjustment.

  2. If this adjustment still fails after step 1, 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.