Tektronix TDS7054, Руководство по обслуживанию

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Performance Tests
4- 58
TDS7104 & TDS7054 Service Manual
H
Touch the Close button.
H
Use the Vertical POSITION knob to center the test signal on screen.
H
Press the Trigger MODE button to toggle it to NORMAL .
2. Confirm the time base is within limits for accuracies:
a.
Measure the test signal
:
H
If using a time-mark generator, align the trigger
T
to the center
vertical graticule line by adjusting the Horizontal POSITION . See
Figure 4--25 on page 4--59.
H
If using a sine wave generator, align the rising edge of the sine wave
on the center graticule crosshairs by adjusting the Horizontal
POSITION .
H
From the button bar, touch the Horiz button and select the HOR-
IZONTAL tab.
H
Press the Horizontal DELAY Mode button to toggle it on. See
Figure 4--25 on page 4--59.
H
Set the delay time to 10.000000 ms. (Do this by touching
Horiz
Delay and on the keypad press 10.000000 , then m followed by
ENTER
).
b.
Check long-term sample rate and delay time accuracies against limits:
H
CHECK that the rising edge of the marker (or sine wave) crosses the
center horizontal graticule line at a point within
±
0.75 divisions of
the center graticule. See Figure 4--25 on page 4--59.
H
Enter the number of divisions on the test record.