Video and General Performance Veri
fi
cation
External Reference Lock
Range
Vary the time base of the reference to measure lock range.
1.
Adjust the AVG1 time base offset to -50 ppm. Verify that the readout in the
lower-left corner of the waveform rasterizer display does not indicate an
unlocked signal. It is normal for the system to momentarily lose lock when
the time base is changed.
NOTE.
The waveform display will not be stable because the SDI time base is
not in sync with the reference.
2.
Increase the negative time base offset until the waveform rasterizer cannot
sustain lock. Record the maximum offset capability in the log table.
3.
Reset AVG1 Module parameters to remove the timebase offset.
4.
Repeat steps 1 and 2, but use positive offsets to test the positive end of the
lock range.
External Reference
Formats Supported:
Tri-Levels (Option HD)
Check that DUT can reference to NTSC and PAL while viewing digital signals.
1.
Disconnect the NTSC black signal from the Reference input, and apply a
1080i 59.94 Tri-Level Sync signal from the AWVG1.
2.
Check that the lower-left corner of the waveform rasterizer display shows
the proper standard for the reference.
3.
Check that the Waveform and Vector displays are locked.
4.
Log either Pass or Fail in the test record.
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Waveform Rasterizers Speci
fi
cations and Performance Veri
fi
cation
Summary of Contents for WVR6020
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