ANSI EIA 00364-107-2000 pdf download Eye Pattern and Jitter Test Procedure for Electrical Connectors, Sockets, Cable Assemblies or Interconnection Systems
4 Test procedure
4.1 General
4.1.1 Allow sufficient time for the equipment to warm-up and stabilize (according to the equipment manufacturer’s instructions).
4.1.2 If the specimen does not have a single-ended characteristic impedance of 50 Ω or a differential impedance of 100 Ω, impedance matching pads should be used. The required values are calculated using the equations in figures A.1 or A.2 of annex A. Use standard resistors having values nearest the values calculated from these equations.
4.1.3 Adjust the data generator for proper signal characteristics. These include rise time, amplitude, data rate, and encoding scheme. NOTE Rise time adjustments shall be made using hardware filters at the signal source and not using software filtering on the analyzer.
4.1.4 Trigger the oscilloscope on the data generator clock signal, making sure the clock signal does not exceed the normal operating range of the clock input port.
4.1.5 Where possible, measure the eye pattern and/or jitter of the fixture and test cables without the specimen. Adjust the oscilloscope controls to display an eye pattern. The time base setting should be selected so that one unit interval (bit period) occupies at least 50% of the horizontal display. The vertical sensitivity should be selected so that the signal amplitude occupies 50% to 100% of the vertical display. See Annex B for examples.
4.2 Eye pattern
4.2.1 Method A, mask test
4.2.1.1 Set the oscilloscope to infinite persistence display mode and set data acquisition to stop after the required number of waveforms.
4.2.1.2 Insert the specimen and initiate data acquisition to generate a preliminary eye pattern.
4.2.1.3 After the preliminary eye pattern data has been acquired, display or create the desired mask. Make sure the eye pattern and mask are positioned with respect to each other and centered on the horizontal axis of the display). The mask should be placed (left to right) so that it best fits into the eye pattern. See Annex B.3 and B.4 for examples.
4.2.1.4 If available, enable the function on the DSO that counts the number of data points that fall within the mask (referred to as “mask hits”).
4.2.1.5 Initiate data acquisition to generate a new eye pattern.
ANSI EIA 00364-107-2000 pdf download
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