User`s guide

Performance Tests Performance Tests
44 Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
Performance Tests
The performance tests given in this section includes the Accuracy Test,
the Linearity Test, the Return Loss Test (for the 81623B/26B) and the
Noise Test. The performance tests for the Agilent 81624B/6B also include
– as optional tests – the Relative Polarization Uncertainty and the Relative
Interference Uncertainty Test. Perform each step in the order given, using
the corresponding test equipment.
The optical cables from the laser source to the 8156A Attenuator and from
there to the power meter must be fixed to the table to ensure minimum
cable movement during the tests.
Make sure that all optical connections are dry and clean. DO NOT USE
INDEX MATCHING OIL. For cleaning, use the cleaning instructions given
in “Cleaning Information” on page 81.
NOTE