Video and General Performance Verification Procedures
4. Press the Input
C button to select the Composite A input.
5. Press the FULL button to make the WFM tile the f
ull screen display.
6. Press the CURSOR button.
7. UsethearrowkeystoselectVolt1 or Volt2.UsetheGENERAL knob to
adjust the cursors to be near the top and zero portions of the waveform.
8. Press and hold the GAIN button, select Gain Settings, and then select.
9. Position the lower c ursor on to the backporch of the waveform.
10. Press and hold the GAIN button, select Gain Settings,andthenx2 and adjust
the vertical position to locate the top of the waveform at the 0 mV graticule.
The second cursor should also be near the zero graticule.
11. Position the upper cursor to be centered on the top of the waveform.
12. Cursor delta displays the magnitude of the waveform. It should be within 1%
of nominal 714.86 mV. Record the amplitude in the test record.
External Re ference Lock
Range (Option CPS)
Vary the time base of the reference to measure lock range.
1. Set the waveform monitor to the factory presets. (See page 60, Restore the
Factory Presets.)
2. Connect the TG2000 AVG1 to one of the CMPST A inputs, and loop the other
CMPST A input to the Ref input. Terminate the other side of the Reference
loop through.
3. Press the Input C button to select the Composite A input.
4. Press the EXT REF button to ativate external reference mode.
5. AdjusttheAVG1timebaseoffsetto–50ppm. Confirm the VECTOR and
WFM d isplays are stable and that the readout in the upper-left corner of the
display does not indicate an unlocked signal. (It is normal for the system to
momentarily lose lock when the time base is changed.)
6. Increase the negative time base offset until the system cannot sustain lock.
Record the maximum offset capability in the test record.
7. Repeat steps 5 and 6 for positive time base offsets.
VITC Decoding
Functionality (Option
CPS)
Apply an NTSC signal with VITC and verify the VITC is correctly decoded.
1. Set the waveform monitor to the factory presets. (See page 60, Restore the
Factory Presets.)
2. Route the NTSC signal from the AVG1 to the VITC encoder.
3. Connect the output of the VITC encoder to one of the CMPST A input
connectors and terminate the other connector.
Waveform Monitors Specifications and P erformance Verification 117
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