Source Power Adjustment

This test applies to the following models:

N9913A/14A/15A/16A/17A/18A
N9925A/26A/27A/28A
N9935A/36A/37A/38A

N991xA, N992xA: Adjust both ports.
N993xA: Only adjust Port 1.
The Max Power and IF Overload adjustment should be performed prior to performing this adjustment.
If the Max Power and IF Overload adjustment is performed, it should always be followed by the Source Power adjustment. The Source Power adjustment should always be followed by the Error Terms adjustment.
All adjustments will require the CFG Option. Refer to the CFG Option section for more information.

The NA source power adjustment is divided into two parts. The first part of the adjustment generates amplitude corrections versus frequency for a fixed output level setting. This is essentially a source flatness adjustment. The second part of the adjustment generates amplitude corrections versus output level setting (i.e. power step accuracy). This part of the adjustment corrects for the non-linear behavior of the output DAC. The algorithm essentially generates the coefficients of a fourth order polynomial that describes the amplitude versus DAC setting.

Related test:

Source Power

Required Test Equipment

Test Equipment	Recommended Model Number (see main equipment list for alternative models)
Power Meter	N1914A
Power Sensor¹	E9304A Opt H20
Power Sensor¹	E4413A
Power Sensor Cable	11730A
The N9918A, N9928A, and N9938A require both power sensors. All other models require the E9304A Opt H20 only.

Connection Setups

The following notes apply to illustrations in the FieldFox Help:

Only a single representative model will be shown.
Some illustrations may differ than those in TME.
For procedures that apply to multiple ports, illustrations will show the setup on only one test port.

Source Power Adjustment

This test applies to the following models:

Required Test Equipment

Connection Setups

Power Meter Calibration, Channel A

Source Power Adjustment Setup, Channel A

Power Meter Calibration, Channel B

Source Power Adjustment Setup, Channel B