Oscilloscope Reference Serial mask testing with mask testing
Mask testing consists of two tasks: signal v iolation detection and pass/fail testing. Signal violation
detection lets you test communications signals for time or amplitude violations against a predefined m ask.
Each mask cons
ists of one or more polygonal regions called segments. The signal waveform data should
stay outside of the segments defined by the mask. Any signal data that occurs inside a mask segment is
called a mask segment violation or "hit."
You can select from any of the included standard telecommunications masks, or you can define your own
custom masks. Selecting a mask automatically sets the instrument communications triggers to properly
display most communication signals in the mask.
Pass/Fail testing defines the mask testing parameters, including the n umber of waveforms to test, how
many mask hits are allowed before failing a test, s etting a mask margin tolerance value, and what action to
perform upon the completion or failure of a test.
Communication triggering enables you to trigger on and display waveforms for industry-standard
communications signals. See Mask Types and Standards
(see page 211) for a list of the supported
standards on which you can trigger.
Automatic communication signal measurements enable you to make automatic measurements on
communications signals. See the Communication Measurement
(see page 278) tab in the Measurement
setup window for the available measurements.
The following are Serial Mask Testing key features:
Predefined masks for testing or triggering on industry-standard signals, such as ITU-T G.703, ANSI
T1.102, Fibre Channel, Ethernet, Video, SONET, Rapid IO, USB, IEEE 1394b, OIF Standards and
their subsets
Autoset, which quickly adjusts the instrument vertical and horizontal controls to display a waveform
in a mask
Autofit, which positions the s ignal on each acquisition to m inimize mask segment hits
Mask margins, which allow you to adjust the default mask margin tolerances
Pass/Fail testing to continuously test a specified number of waveforms against a mask
A mask editor for creating, saving, and recalling user-defined masks
Waveform database technology to perform mask testing based on waveforms accumulated in a
database, rather than a single waveform stored in acquisition memory
Communications triggers to trigger the instrument on industry-standard communications signals
Automatic measurements on communications signals
NOTE. If a standard listed in this manual is not available on your instrument, it is because the
configuration or bandwidth of your instrument cannot test that standard.
Although this oscilloscope is not a calibrated optical reference receiver, you can use it with mask testing to
evaluate general optical signal characteristics and wave shape, using an external O/ E co
nverter.
What do you want to do next?
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 783
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