Tektronix VITS100 Frequency Response and Crosstalk

Performance Verification
5–20 VITS100 NTSC VITS Inserter Instruction Manual
27. Connect a 50 W-to-75W minimum loss attenuator to the spectrum analyzer
RF Input.
28. Connect a 75 W coaxial cable from the 50 W-to-75W minimum loss
attenuator to the VITS inserter PROGRAM OUT.
29. Connect a 75 W coaxial cable from the television test signal generator output
to the VITS inserter PROGRAM IN.
30. Select television test signal generator Red Field.
31. Select maximum hold on the spectrum analyzer.
32. Set the spectrum analyzer frequency marker to the top of the chrominance
spike of the red field.
33. Set the spectrum analyzer Marker control to differential mode.
34. Leave one marker at the top of the red field spike and move the other marker
to any spurious spikes out to 50 MHz to verify that all spurious spikes are at
least 55 dBm down as displayed on the differential marker level readout.
Requirement: Flat frequency response1% to 5.5 MHz; 3% to 10 MHz
NOTE. Successful completion of the frequency response checks guarantees that
crosstalk is within specification.
1. Use two 75 W coaxial cables connected together with a BNC female-to-fe-
male adapter to connect the TSG/SPG Multiburst Generator output to the
Peak-to-Peak Detector Head Input. See Figure 5–10.
TSG/SPG
Test oscilloscope
Peak-to-peak
detector
OUTPUTINPUT
BNC
Adapter Peak-to-peak
detector head
Multiburst
Out
Figure 5–10: The initial frequency response setup
Frequency Response and
Crosstalk