Optical Sampling Modules
Optical Sampling Modules
The following performance veri
fi
cation procedures for the optical sampling
modules check the characteristics that are shown as checked speci
fi
cations (
symbol) in the optical module tables of the
DSA8300 Digital Serial Analyzer
Speci
fi
cations
manual.
Prerequisites
Be sure you have performed the appropriate
Prerequisites
before doing any
procedures in this section. (See page 16,
NOTE.
The procedures throughout this chapter contain instructions based on the
menus and controls from the most updated instrument software available at the
time this document was released. These procedures will work for other versions of
software, but some control and menu names may vary slightly.
Dark Level and Vertical Equivalent Optical Noise
This procedure checks the dark level, which is the offset in the optical channel
caused by thermal variations or
fi
nite leakage current. This procedure also checks
the vertical equivalent optical noise. The checks are made with vertical offset
set to zero and no optical signal input to the optical sampling module (dustcap
installed on the OPTICAL INPUT).
Equipment required
Terminator, 50
Ω
coaxial, SMA male; used with optical sampling
modules with clock recovery (CR) (item 30)
Prerequisites
Setup
Figure 28: Dark level and vertical equivalent optical noise test setup
DSA8300 Performance Veri
fi
cation
219
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