Video and General Performance Verification
19. In the test reco
rd, record the deviation from reference that has the largest
magnitude, either largest - reference or smallest - reference.
Adjust. If the Frequency Response is outside the specification, press the
CONFIG, select Utilities, and then select Calibration and follow the on-screen
instructions to adjust the response. Follow the instructions at the bottom of t he
screen to Sa
ve and Exit calibration mode. Afterwards, repeat the above test for
Analog Frequency Response and record the new value in the test record.
Composite Analog Delay
Variation
Over Frequency
(Group Delay) (Option
CPS)
Use 5.75 MHz 5T multi-pulse signal and cursors to measure group delay.
1. Press FACTORY on the waveform rasterizer.
2. Press CONFIG, select Graticules and set Cmpst Waveform Graticule Units to
mV.
3. Connect the precision video generator to one of the Composite A input
connectors and terminate the other connector with the precision terminator.
4. Set the precision generator for 5.75 MHz multiburst. This is a custom test
signal with more packets for better coverage.
5. Press the CMPST A, CURSOR and FULL buttons.
6. Adjust the cursors to be near the zero portions of the waveform.
7. Press 5X and VAR. Use the GENERAL knob to increase the gain to 10X.
8. Use t
he cursors to measure the peak-to-peak deviation in the baseline o f the
multipulse packets.
9. The
peak-to-peak deviation of the baseline is 0.1% per ns. For example, for
a 10 ns deviation on a 714 mV signal yields a deviation 7.1 mV. Record the
measured value in the test record.
102 Waveform Rasterizers Specifications and Performance Verification
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