Tektronix TDS6404, Руководство по обслуживанию

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Performance Tests
4- 80
TDS6000 Series Service Manual
Table 4- 8: Serial pattern data
Serial pattern data Trigger location
DB6D B6DB
16
One UI before the 0
B6DB 6DB6
16
At the 0
6DB6 DB6D
16
One UI after the 0
2.
Verify that the signal path can do isolated 0 and pattern matching circuits
can do isolated 1:
a. From the button bar, touch Cursors and then the Setup button.
b.
Set the Tracking Mode to
Tracking
.
c. Touch the Close button.
d. Adjust the cursors until the
∆
t readout equals 800 ps (one unit interval).
Center the cursors around the center graticule line (see Figure 4--35).
e. From the button bar, touch Trig and select the A Event tab.
f. Touch the Serial Trigger Type button and then set the Standard to
GB Ethernet .
g. Touch the Editor button.
h. Set the Format to Hex and then touch the Clear button.
i.
Enter data into the Serial Pattern Data field for one of the settings in
Table 4--8 that is not yet checked. (Start with the first setting listed.)
j. Touch Apply .
k. Verify that the instrument triggers one Unit Interval (UI, one baud
divided by the bit period) before the 0 in the input signal (see Figure
4--35). Enter pass or fail in the test record.
l. Touch the Clear button.
m.
Enter data into Serial Pattern Data field for the next setting in Table 4--8
that is not yet checked.
n. Touch Apply .
o.
Verify that the instrument triggers at the 0 in the input signal (see
Figure 4--35). Enter pass or fail in the test record.