Video and General Performance Verification
WVR6100, WVR7000, and WVR7100 Specifications and Performance Verification
2- 41
This test looks for cross-talk between the two SDI inputs. One input is driven by
a signal straight from the generator; the second input is driven through the cable
clone, which simulates a long cable. The two sources are set to different rates to
allow transitions of the serial signal to hit all possible phases. If the isolation is
sufficient, the cross-talk will not introduce errors.
1.
Press FACTORY, and then press the DISPLAY SELECT 4 button.
2.
Press STATUS to display the status screen in tile 4.
3.
Press and hold STATUS to display the pop-up menu, and then select Video
Session.
4.
Connect a cable to any output on the TG2000 HDVG1.
5.
Connect the other end of the cable to the 80 m section of the HD Cable
clone.
6.
Connect a second cable to the other port of the cable clone section.
7.
Connect a cable from the cable clone to one of the SDI Input A connectors.
8.
Terminate the other SDI Input A connector.
9.
Connect an output from the DVG1 to one of the SDI Input B connectors.
10.
Terminate the other SDI Input B connector.
11.
Set the signal driving SDI Input B to 100% color bars.
12.
Set the time base on the second signal to 1 ppm high.
13.
Verify that there are no CRC errors on the SDI A input.
14.
Record a pass or fail as appropriate in the test record.
15.
Disconnect the test setup.
This test uses a network analyzer to check the reflections from the input. You can
also use the Spectrum Analyzer, tracking generator, and return loss bridge to
make this measurement.
1.
Turn on the network analyzer and set it for Return loss (the S11 measure-
ment).
2.
Set the frequency range for approximately 300 kHz to 2 GHz.
3.
Use the calibration kit and calibrate the network analyzer with one of the
BNC cables attached.
4.
Connect the calibrated end of the cable to the SDI input A of the waveform
rasterizer.
HD SDI Loop-through
Isolation
(WVR7000 / WVR7100
Only)
HD SDI Return Loss,
A and B Inputs
(WVR7000 / WVR7100
Only)