Specifications

Chapter 3 3-5

User Interface

Flatness Compensation Table

The following sections will cover the following:

• “Accessing the Flatness Compensation Table” on page 3-5.

• “GPIB Control of the Flatness Compensation Table” on page 3-5

• “Reloading the Flatness Correction Table” on page 3-6.

• “Recreating the Flatness Correction Table” on page 3-7.

Accessing the Flatness Compensation Table

During the Swept Flatness test routine at the factory, correction data points are collected

with the highband preamp in the OFF state. The test is then run again with the highband

preamp ON. The corrections are then applied to get the best flatness response.

The flatness compensation table is available for the user to apply corrections for an

improved flatness response while the highband preamp is on. The following keystrokes

will aid the user in accessing the flatness compensation table.

[AMPLITUDE] > More 1 of 3 > Corrections > Other > Correction > On | Off

NOTE

When sweeping from below 2.85 GHz to above 3.05 GHz, the corrections

table will cause amplitude errors in the 2.85 GHz – 3 GHz band. To

avoid these errors, set the start frequency above 2.85 GHz.

NOTE

The instrument does not automatically enable the Amplitude

Corrections, they must be enabled by the user where appropriate.

Unlike the option 1DS lowband preamp where the lowband preamp

flatness is corrected automatically, the Amplitude Correction “OTHER”

must be turned “ON” when the Preamp is turned “ON” and turned

“OFF” when the Preamp is turned “OFF.” Measurement errors will

result if this is not done.

GPIB Control of the Flatness Compensation Table

The following SCPI commands related to the Agilent E444xA Option 1DS and H26.

Refer to Agilent Technologies PSA Spectrum Analyzer User’s and Programmer’s Reference

Guide, to locate SCPI command subsystems and subsections that apply to the standard

functions of the Agilent Technologies E444xA PSA-Series Spectrum Analyzer.