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Performance Verification
VITS100 NTSC VITS Inserter Instruction Manual
5–17
30. Change the coaxial cable from the TSG/SPG color bar output to the black
burst output.
31. Measure burst amplitude. It should measure about 40 IRE.
32. Use the TSG/SPG variable burst control to reduce burst amplitude to 28 IRE
(–3 dB).
33. Set the red vector to the outer circle and 0_ on the waveform/vector monitor
vectorscope. Set the red bar to null on the waveform monitor.
34. Check that the red bar phase changes ≤ 2_ as you vary the Burst amplitude
from 28 IRE to 56 IRE (–3 dB to +3 dB).
35. Set the burst amplitude to 80 IRE the waveform monitor (+ 6 dB).
36. Set the red bar to null on the waveform monitor.
37. Check that the red bar phase changes ≤ 3_ as you vary the burst amplitude
from 80 IRE to 20 IRE (+6 dB to –6 dB).
38. Return the TSG/SPG variable burst control to normal.
39. Set the red vector to the outer circle and 0_ on the waveform/vector monitor
vectorscope. Set the red bar to null on the waveform monitor.
40. Set the TSG/SPG for 20 Hz of offset.
41. Check after the genlock has settled that the red bar has shifted less than 1_
(10 IRE).
42. Change the 20 Hz offset polarity.
43. Check after the genlock has settled, that the red bar has shifted less than 1_
(10 IRE).
44. Turn off the 20 Hz offset.
45. Set video noise generator for 28 dB noise.
46. Turn White Noise on.
47. Check that the VITS inserter remains locked.
48. Disconnect the video noise generator from the VITS inserter.