Video and General Performance Verification Procedures
19. Repeat the test
using SDI B input on the waveform monitor.
20. Record this level in the test record.
3Gb/sSDIInput
Equalization Range
(Option 3G)
1. Connect a cable from the output of the 3Gb/s test signal source to the 3Gb/s
Cable Clone with sections assembled tot
aling 70 meters of 1694A.
NOTE. A WFM7120 with option JIT can be configured as a test signal source.(See
page 78, 3 Gb/s S DI Verification Test (Option 3G).)
2. Use a second cable to connect the other port of the Cable Clone assembly to
the SDI A connector on the waveform monitor.
3. Check that the CRC Error indicators in the Video Session screen read OK.
4. Assemble the Cable Clone sections to simulate longer lengths to find the
longest length that does not generate any CRC errors in a 10 second period.
5. Divide the simulated length in meters by 4 to calculate the attenuation in
dB at 1.5 GHz.
6. The attenuation value is typically greater than 17.5 dB.
7. Repeat the test using the SDI B input on the waveform monitor.
HD SDI Loop- through
Isolation (Option HD)
This test looks for crosstalk 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 crosstalk will not introduce errors.
1. Set the waveform monitor to the factory presets. (See page 60, Restore the
Factory Presets.)
2. If you do not have the video status screen displayed, press the DISPLAY
SELECT 4 button, press and hold the STATUS button, and select Video
Session.
3. Press the STATUS button to close the menu.
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 the SDI A input connector.
8. Connect an output from the DVG1 to the SDI B input connector.
9. Set the signal driving the SDI B input to 100% color bars.
Waveform Monitors Specifications and P erformance Verification 85
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