How To Obtain Exact Results; Mechanical Stability; Selection Of The Optical Heads - Agilent Technologies HP E5574A User Manual

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Introducing the HP E5574A Optical Loss Analyzer

How to Obtain Exact Results

measured within that time. The display is automatically
updated.
2 Observe the stability value.
If you leave your set-up untouched, it will reach a minimum.
You can decide whether the stability value supports your
requirements or not. For example: If you are measuring a signal of
0.1 dB and only 10 % accuracy is required, a stability value of 0.01
dB may suffice.
However, in most cases a stability value below 0.002 dB can be
achieved in a few seconds.
How to Obtain Exact Results
The accuracy and reproducibility of the measured results depend
largely on your setup. It must be mechanically stable and you must
attach adequate heads and connectors.

Mechanical Stability

The signal variations caused by polarization are usually rather
small. Vibrations or movement of the optical cables will cause
relatively large measurement errors.
The use of an optical workbench is therefore recommended. You
should use adhesive tape or clamps to attach as much of the optical
cables to the bench as possible.

Selection of the Optical Heads

See the HP E5574A Technical Data sheet for information on the
optical heads.
Optical head HP 81521B opt. 001 is recommended for all
polarization dependent measurements. It is the only head which has
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