Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4-115
H Adjust the trigger LEVEL to trigger at 25% (--1 division) on the
sine wave.
Table 4- 10: Serial pattern data
Serial pattern data Trigger location
B6DB 6DB6 DB6D B6DB
16
One UI before the 0
6DB6 DB6D B6DB 6DB6
16
At the 0
DB6D B6DB 6DB6 DB6D
16
One UI after the 0
2. Verify that the signal path can do isolated 0 and pattern matching circuits
candoisolated1:
a. From the button bar, touch Cursors andthentheSetup button. If using
the menu bar , touch Cursors and then select Cursor Setup. Touch the
Cursor button to toggle it on and display the cursors.
b. Set the Tracking Mode to Tracking.
c. Touch the Close button.
d. Adjust the cursors until the Δt readout equals 800 ps (one unit interval).
Center the cursors around the center graticule line (see Figure 4--36).
e. From the button bar, touch Trig, select the AEventtab, and touch the
Select button.
f. Touch the Serial 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--10 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--36). 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--10
that is not yet checked.
n. Touch Apply.
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