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. S ee Figure 4--25 on page 4--59.
H Enter the number of divisions on the test record.
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