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 full screen display.
6. Set the timecode source to VITC:
a. Press the CONFIG button.
b. Select AuxDataSettings.
c. Select Timecode Display.
d. Select VITC.
7. Verify that Decoded VITC is displayed in the lower-right corner of the
waveform monitor display.
8. Verify that the VITC is correct and record Pass or Fail in the test record.
Signal Source Characterization for Eye Signal Bandwidth
Measuring eye signal bandwidth requires a 75 W RF sine wave signal source
thatcanbeconnectedtothe75Ω BNC input, and is either characterized or
automatically leveled. The results of characterization must be applied at each
measurement frequency, either by adjusting the generator level setting, or by
applying a correction to the amplitude reading from the unit under test.
Themethoddescribedhereusesa50Ω generator, 50 to 75 Ω min loss pad, and
appropriate adapters and cables to connect to the 75 Ω female BNC input of
the unit under test. The exact sequence of adapters, min-loss pad, and cables
is not critical as long as correct impedance is maintained in each section, and
as long as the complete setup is use d exactly as characte rized whe n measuring
Eye bandwidth.
The absolute signal level should be chosen to give between 750 and 850 mV
p-p
at the reference frequency, as viewed on the unit under test when in Eye BW
check mode. With a setup consisting of a 50 Ω generator, a 5.7 dB min loss pad
and appropriate adapters and cables, a base g enerator setting of 6.3 dBm normally
gives this result.
Characterization Process
Characterize the test setup as follows to give a table of level setting vs frequency
setting for the signal source, resulting in constant signal level at the connection
point to the unit under test.
1. Connect the generator and the required converter, adapters, and cables to
the wideband power detector.
2. Set the generator to the reference frequency, 100 MHz, and the base level,
typically 6.3 dBm.
3. Enter ‘100 MHz’ into the power meter, to apply the appropriate internal
correction.
118 Waveform Monitors Specifications and Performance Verification
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