Video and General Performance Verification
External Reference Lock
Range
Vary the time ba
se 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 co
rner of the waveform rasterizer display does not indicate an
unlocked s ignal. It is n ormal for the system to m omentarily 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 refe rence.
2. Increasethenegativetimebaseoffsetuntil the waveform rasterizer cannot
sustain lock. Record the maximum offset capability in the log table.
3. Reset AVG1 Module parameters to remove the timebase o ffset.
4. Repeat steps 1 and 2, but use positive offsets to test the positive end of the
lock range.
External Reference
Formats Sup ported:
Tri-Le
vels (Option HD)
Check that DUT can reference to NTSC and PAL while viewing digital signals.
1. Disco
nnect the NTSC black signal from the Reference input, and apply a
1080i 59.94 Tri-Level Sync signal from the AWVG1.
2. Chec
k that the lower-left corner of the waveform rasterizer display shows
the proper standard for the reference.
3. Chec
k that the Waveform and Vector displays are locked.
4. Log either Pass or Fail in the test record.
80 Waveform Rasterizers Specifications and Performance Verification
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