
8712ET/ES and 8714ET/ES Performance Checks
RF Network Analyzers Performance Test Software
Service Guide 1-35
PT11: Crosstalk
This test measures the crosstalk between the output signal path and the input signal path
inside the analyzer at maximum specified output power level. The test makes a
narrowband transmission measurement with shorts connected to both test ports.
Test Process.Attach a short to each test port on the analyzer. Preset the analyzer and set
the power level to the maximum power specified for the particular model/option
configuration of the instrument. Set the system bandwidth to fine (15 Hz) and the
averaging factor to 4. Enable averaging. Check the trace; it must be below the crosstalk
limit given in the specification. For example, if the specification is 80 dB, the trace must be
below−80 dB.
For ES models, repeat the test for a reverse transmission (S12) measurement.
Specification Verified.This test verifies the “System Performance, Uncorrected:
Crosstalk” specification inTable1-6on page1-55 andTable1-7on page1-56.
If This Test Fails.Check cabling and shielding on the A4 source board and the A5
receiver assembly.
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