Tektronix VITS100 SCH Phase, Signal-to-Noise Ratio, Hum Rejection

Performance Verification
VITS100 NTSC VITS Inserter Instruction Manual 5–13
Requirement: SCH phase + 0_"5_.
1. Select the video measurement set SCH Phase measurement.
2. Check that the SCH phase is 0_"5_.
3. Select line 18, any field, on the video measurement set.
4. Check that the SCH phase is 0_"5_.
Requirement: Signal-to-noise ratio >70 dB.
1. Select black burst from the television test signal generator.
2. Check the black burst noise spectrum on the video measurement set for a
noise level number greater than 70 dB.
3. Move the coaxial cable from VITS inserter MONITOR OUT to the
PROGRAM OUT.
4. Check that the noise level number is greater than 70 dB.
5. Select line 18, any field, on the video measurement set.
6. Check that the noise level number is greater than 70 dB.
Requirement: Hum rejection w50 dB.
1. Connect a 75 W coaxial cable from the television test signal generator to the
video noise generator Video Input. See Figure 5–8.
2. Connect a 75 W coaxial cable from the video noise generator Output to the
VITS inserter PROGRAM IN.
3. Turn video noise generator Hum On.
4. Set video noise generator attenuator to 0 dB.
5. Connect a 75 W coaxial cable from the VITS inserter PROGRAM OUT to
the video measurement set Ch A. Terminate the remaining side of the
loop-through input with a 75 W terminator. See Figure 5–8.
SCH Phase
Signal-to-Noise Ratio
Hum Rejection