Tektronix HDVG1, Руководство по обслуживанию

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Performance Verification
4- 8
HDVG1 HDTV Digital Video Generator Service Manual
d. On the digital audio monitor front panel, press the CH STATUS button
to display
CHANNEL STATUS
view.
e. In the view, check CRC errors are not displayed.
f. On the digital audio monitor front panel, press the Audio View button.
g. Check that the digital audio monitor bar graphs show both Channel 1
and Channel 2 at --20 dBfs.
6. Check that the correct color bar and “overlay” text are displayed on the
HDTV picture monitor.
7.
Change the coaxial cable connection from OUTPUT 1 connector to
OUTPUT 2 connector on the HDVG1 Generator module and repeat step 4
and step 5.
8.
Change the coaxial cable connection from OUTPUT 2 connector to
OUTPUT 3 connector on the HDVG1 Generator module and repeat step 4
and step 5.
Equipment
required
Two 75
Ω
coaxial cables
One AMT75
Two SMA-to-BNC adapters
Sampling oscilloscope with sampling head
Connections. Refer to Figure 4--2 for connections.
Use the AMT75, 75
Ω
coaxial cables, and SMA-to-BNC adaptors to make the
following connections:
NOTE
. Some sampling oscilloscopes do not automatically adjust their readouts
to account for the
­
5 attenuation of the AMT75. You must remember to account
for this attenuation while viewing the oscilloscope readouts if you are using an
oscilloscope of this type.
H
Connect the OUTPUT 1 connector on the HDVG1 Generator module to the
AMT75 and then to the CH1 input connector on the oscilloscope sampling
head.
H
Connect the OUTPUT 2 connector on the HDVG1 Generator module to the
TRIGGER INPUTS DIRECT connector on the oscilloscope sampling head.
Eye Pattern Check