Tektronix WVR6020, Техническое описание

Страница: 98 / 138

Video and General Performance Veri fi cation
1. Press FACTORY.
2. Press and hold STATUS, and then select Display Type > SDI Status.
3. Using the short cable, connect an HDVG1 output to the waveform rasterizer
SDI A input. Terminate the other SDI A connector with a 75
Ω SDI terminator.
4. Set the HDVG1 to generate a 1080i 59.94 75% Color Bars signal.
5. Check that the cable length reading is between 0 m and 17 m.
6. Record the result in the test record.
7. Replace the short cable with the long one, or set the cable clone to 100 m.
8. Check that the cable length reading is between 76 m and 127 m.
9. Record the result in the test record.
10. If any cable length reading is outside the speci fi cation, perform the following
adjustment procedure. Perform both the Short HD and Long HD steps for any
input (SDI A or SDI B) that was found to be outside the speci
fi cation.
NOTE.
Be sure to use a generator with SDI output set as close as possible to
800 mV, since the Cable Meter adjustment establishes the Source Level as well as
the Approx Cable (cable length) calibration.
11. Press CONFIG, select Utilities > Calibration, and then press SEL to start
the calibration process.
12. Using the up and down arrow buttons, navigate to the Cable Meter calibration
cases, press SEL to start, and follow the on-screen instructions.
13. Repeat steps 3 through 10 for the SDI B input and record the new results
in the test record.
HD Jitter Noise Floor
(Option HD and EYE or
PHY)
This test checks the jitter noise fl oor of the waveform rasterizer. Since some
jitter may be introduced by the signal source, you may need to characterize the
TG2000 output jitter with an oscilloscope. Most HDVG1 modules have an output
noise
fl oor in the 80 ps range.
1. Press FACTORY.
2. Connect the TG2000 HDVG1 output to the HDST1 input, and connect
the HDST1 STRESS output to the rasterizer SDI A input. Terminate the
loopthrough connector on the rasterizer.
3. Reset the HDST1 to default on all SDI parameters.
4. Set the HDVG1 to generate a 1080i 59.94 100% Color Bars signal.
84 Waveform Rasterizers Speci fi cations and Performance Veri fi cation