EXFO FTB-5800 Chromatic Dispersion Analyzer for FTB-400 - Manual (Page 34)

Operating Your Chromatic Dispersion Analyzer
28 FTB-5800
Performing Reference Measurements
Performing Reference Measurements
I
MPORTANT
To ensure the best possible results, EXFO recommends performing
reference measurements for wavelength and for chromatic
dispersion. Furthermore, you must perform a wavelength reference
BEFORE performing the chromatic dispersion reference.
Skipping wavelength reference may lead to inaccurate results. You
cannot perform both references in a single step.
Reference
type
Recommended reference
frequency
Remarks
Wavelength Before each test session
and every time the
application recommends it.
³
Adjusts the source wavelength precisely.
³
The application will advise you to take a
wavelength reference whenever the
need arises (after selecting a different
source type, after module initialization,
after a certain period of time or when
temperature varies), but never during
acquisitions.
When references are necessary, a
message will appear in the status bar,
recommending a new reference.
Chromatic
dispersion
Once every month and
every time the source or
patchcord is changed.
³
Used to cancel out source, analyzer and
patchcord dispersion.
It will be taken according to the sources
you have selected
(C-source; C-reference).
³
Important for low-chromatic-dispersion
measurement.