Video and General Performance Verification
Composite Analog
Input DC Restore Hum
Attenuation (Option CPS)
Apply hum, and t
hen measure the attenuation with clamp in all three modes.
1. Press FACTORY.
2. Connect an NTSC color bar signal to the video input of the AVC1. Route the
video output of the AVC1 (not the precision video output) to the Composite
A input of th
e waveform rasterizer. Terminate the other connector with a
precision terminator.
3. Set the AVC1
for 0 dB of 60 Hz hum.
4. Press the CMPST A button and then the FULL button.
5. Press FIELD twice to get a 2-field sweep (if you cannot get 2-field, make sure
the display style is set to Overlay).
6. Select CONFIG > Composite Input > DC Restore > Off.
7. Press CURSOR and measure the peak-to-peak hum with the cursors. The
measurement should be about 714 mV.
8. Select CONFIG > Composite Input > DC Restore > Fast.
9. Press the CONFIG button to dismiss the pop-up menu.
10. Measure the peak-to-peak hum with the cursors. It should be less than 5% of
the measurement in step 7.
11. Record the value in the test record.
12. Sele
ct CONFIG > Composite Input > DC Restore > Slow.
13. Press the CONFIG button to dismiss the pop-up menu.
14. Measure the peak-to-peak hum with the cursors. It should be between 90%
and 110% of the measurement in step 7.
15. Record the value in the test record.
Waveform Rasterizers Specifications and Performance Verification 107
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