Video and General Performance Verification
Composite Analog I nput
DC Offset Restore Off
(Option CPS)
Measure the d is
played offset when the input is undriven and DC Restore is off.
1. Press FACTORY.
2. Apply an NTSC signal from the AVG1 output to the Composite A input of the
waveform rasterizer. Terminate the other Composite A input with a precision
terminatio
n.
3. Terminate one side of the Composite B input with a precision termination.
4. Switch off DC Restore by selecting CONFIG > Composite Input > DC
Restore > Off.
5. Press CMPST A, and allow the waveform rasterizer to recognize and lock to
the input signal.
6. Press CMPST B, CURSOR, and FULL.
7. Press 5X.
8. Push and hold WFM, select Center Waveform from the pop-up menu, and
then press SELECT.
9. Press WFM again to remove the pop-up menu.
10. Set the cursor to the center of the flat-line waveform. Note the waveform
offset indicated by the cursor readout.
11. Connect the NTSC signal from the AVG1 output to the Composite B input.
12. Pres
sCMPSTA.
13. Set the cursor to the center of the flat-line waveform. Note the waveform
off
set indicated by the cursor readout.
14. Record the larger of the two waveform offset values in the test record.
15. Perform the following steps if the Offset is outside the specification:
a. Select CONFIG > Utilities > Calibration and follow the on-screen
instructions to automatically adjust the offset.
b. Follow the instructions at the bottom of the screen to Save and Exit
Calibration mode.
c. Afterwards, repeat steps 1-14 above and record the new value in the test
record.
Waveform Rasterizers Specifications and Performance Verification 105
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