User`s guide

6-2 User’s and Service Guide

Service

Performance Tests

Performance testing consists of measuring insertion loss, return loss,

and isolation between all ports. For the most accurate measurements,

the use of an Agilent 8720D 50 Ω network analyzer is recommended

and its use is assumed in these notes. Familiarity with RF/microwave

measurements is also assumed. The use of adapters may be required

and their effects should be accounted for. Performance tests will require

the following equipment:

• Agilent 8720D Network Analyzer

• Test Port Extension Cables, part number 85131-60012

• Agilent 85052B Cal Kit

• Agilent 909D Option 040 or part number 00909-60007 50 Ω

Terminator

NOTE Make a photocopy of the performance test record (later in this chapter)

to record the results of the performance tests.

There are no adjustments required for the 87050A Option K24 test set.

Perform a full two-port calibration from 50 MHz to 20 GHz at the ends

of two cables attached to the two test ports of the 8720D. Make sure the

calibration is active. Save the results to disk, as they will be used again.

Set up the 8720D with the following:

1. Set the number of points to “201”

2. Set the Bandwidth to “300 Hz”

3. Set the 8720D to “Step Sweep”

NOTE The Isolation Cal Routine is done with 16 averages.