Tektronix TDS7054, Service Manual

Page: 110 / 254

Performance Tests
4- 50
TDS7104 & TDS7054 Service Manual
d. Save CH 3 waveform:
H
Move the power divider from CH 2 to CH 3 , so that CH 1 and
CH 3
are driven. Press the Vertical
CH 2
and
CH 3
buttons. Select
the Ref 3 tab and touch the Ch Channel 3 button. Touch the Save
Wfm to Ref3
Save
button.
e. Display all test signals:
H
Press the CH 3 Vertical button to remove CH 3 from the display.
H
Display the live waveform. Move the power divider from CH 3 to
CH 4
, so that CH 1 and CH 4 are driven. Press the Vertical
CH 4
button to display. See Figure 4--22 on page 4--51.
H
Display the reference waveforms. To do this, touch the Ref 3
Display
Off button to toggle it to On and display the reference.
Select the Ref 2 tab and touch the Display Off button to toggle it to
On. You may notice their overlapping waveform handle icons. See
Figure 4--22 on page 4--51.
f. Measure the test signal:
H
Locate the time reference points for these waveforms. Do this by
first identifying the point where the rising edge of the left-most
waveform crosses the center horizontal graticule line. Next, note the
corresponding
time reference point
for the right-most waveform. See
Figure 4--22 on page 4--51.
H
Press CURSORS and select the V Bars Cursors Type.
H
Touch the Close button.