Performance Verification
68
GTS1063 and GTS1250 GBIC Test Systems Instruction Manual
5. Set the GBIC Test System Transmit pattern to K28.5.
6. Perform the initial setup of the oscilloscope using the following steps:
a. Initialize the oscilloscope to default settings using the Initialize selector
which appears in the Utility major menu.
b. From the Trigger major menu, set the trigger source to external.
c.
Set the trigger level to 0.0 V; set the trigger polarity to positive edge.
d. Display the SD-22 channel.
e.
Set the Vertical Size to 50 mV/div.
f.
Set the Horizontal Size to 100 ps/div.
g. Set the oscilloscope record length to 512 points.
7. Perform the test with the following sequence on the oscilloscope:
a. Find a rising clock edge that is displayed between 20 to 30 ns horizontal
timing position; adjust the waveform so that the 50% rising edge
crossing point of the clock signal is at the center of the graticule grid of
the oscilloscope display.
b. Set the Horizontal positioning mode to expand about the CENTER.
c.
Set the Vertical Size to 5 mV/div; set the Horizontal Size to 5 ps/div; if
the waveform was not properly centered, adjust the horizontal position
slightly to maintain the edge crossing near the center the the display.
d. Define a horizontal histogram across the middle of the display with a
height of 1 mV (see Figure 31). Set the display mode to STOP on N
waveforms where N is set to 1000; touching the STOP ON N button in
the Display menu will begin an infinite persistence acquisition of the
waveform which will stop acquiring after 1000 waveforms have been
accumulated.
e.
Along the bottom of the display, note the RMS (that is, standard
deviation) value of the resulting histogram result. This is the horizontal
RMS jitter of the Clock to Data; Verify that the jitter value is
t
4 ps
RMS and
t
35 ps peak-to-peak.
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