User`s guide

Agilent PXT Wireless Communications Test Set

User’s Guide

Amplitude Offsets

Accesses the amplitude offsets table and menu keys.

Amplitude offsets compensate for loss or gain between the test set's RF IN/OUT front panel connector and

the UE's RF connector.

Amplitude offset settings are preserved during power cycles or instrument preset.

There are two methods for entering offsets. They do not interact with each other. You must choose to use

one or the other method.

• The tabular method which defines frequency vs. offset compensation (operates exactly like that in

the 8960 One Box Tester). For more information, see The Tabular Method

, below.

• The globally applied offsets method which applies a single value offset to the RF input and a

separately defined single value offset to RF output.

Mode

BSE, SA

Initial S/W Revision

6.4

Key Path

Mode > BSE > Config

Amplitude Offset Table

This menu key determines whether the Amplitude Offset Table is applied (On) or not (Off).

On: Applies offsets based on the values in the table. Disables input and output offset menu keys.

Off: Disables table offset values, so they are not applied. Enables input and output offset menu keys.

For more information, see The Tabular Method

, below.

Mode

BSE, SA

Range

-100 dB to +100 dB

Preset

0 dB

State Saved Amplitude offset settings are preserved during power cycles or

instrument preset.

Initial S/W Revision

6.4

Key Path

Mode > Config > Amplitude Offsets

The Tabular Method

Since some cables have different losses at different frequencies, you may want to characterize their cable

loss over frequency. This effect is especially seen where the UE supports multiple bands and the range of

frequencies is high. This amplitude offset feature enables you to enter the losses into a table and allow the

PXT to handle this compensation automatically. As the DL and UL frequency used by the PXT changes, the

offset values are also changed according to the settings you specify in the table.

Using the tabular method enables you to enter frequency dependent values for path loss unlike the global

application of path loss which is applied when you use RF1 Output Power Offset, RF2 Output Power Offset,

RF1 Input Power Offset menu keys.