Tektronix WFM700 Series, Service Manual

Page: 56 / 194

Performance Verification
2- 24
WFM700 Series Waveform Monitors Service Manual
6. Press the DISPLAY button and touch the Thumbnail Picture soft key (to
turn off the thumbnail picture).
7.
Press the
WFM
button.
8. Press the INPUT button and select Input A .
9. Touch the Reference: soft key so that Reference is set to External .
10. CHECK that the displayed waveform remains locked to the external
reference.
NOTE
. The waveform is considered locked if the color bar steps are distinct and
the red
I
Unlocked
I
message is not present.
The appearance of the displayed waveform depends on the phase or frequency
difference between the HD video generator and the analog video generator
. A
phase difference causes a horizontal shift of the waveform, while a frequency
difference causes the waveform to slowly roll horizontally.
11. Set the analog video generator for a 1080i 60 black signal.
12.
Set the HD video generator for a 1080i 60 100% color bars signal.
13. CHECK that the displayed waveform remains locked to the external
reference.
14. Set the analog video generator for a 720p 59.94 black signal.
15.
Set the HD video generator for a 720p 59.94 100% color bars signal.
16. CHECK that the displayed waveform remains locked to the external
reference.
17. Touch the Reference: soft key so that Reference is set to Internal .
18. Disconnect the analog video generator.