Test The Complement Of The Bits (250 Mb/S Mode) - Agilent Technologies 16800 Series Service Manual

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Test the complement of the bits (250 Mb/s mode)

16800 Series Portable Logic Analyzers Service Guide
As a point of curiosity, you may want to determine the absolute minimum
pulse width and/or absolute maximum frequency at which data can be
acquired. The "Performance Test Record"
places for recording these values because the Performance Verification
procedure only verifies that the logic analyzer meets specifications.
Determination of additional parameters is not required, but may be
performed at the discretion of the calibration laboratory.
On some pulse generators, the signal outputs may become unstable for a
short period of time when the signal parameters are adjusted. Adjusting
the pulse generator while the logic analyzer is running can cause a false
failure.
If the error message is displayed immediately after making an adjustment
to the pulse generator, select OK to close the error display dialog and
re-run the logic analyzer.
Now test the logic analyzer using complement data.
On the 8133A pulse generator, in the PULSE setup for
1
CHANNEL 2, select COMP.
2 Note that the signal on the oscilloscope has moved.
Change the oscilloscope's horizontal position to - 725 ps
(or as required) to center the measured pulse on the
oscilloscope display.
Verify the DC offset and adjust it if necessary. See
3
page 41.
Deskew the oscilloscope if necessary. See
4
Adjust the oscilloscope's measurement markers to
5
measure the pulse width. Set the markers so that
Δ=1.43 ns (this assumes you are using the 8133A pulse
generator and the Infiniium 54845A oscilloscope). Adjust
the pulse generator so that the pulse width is 1.43 ns as
measured by the markers. See
Testing Performance
on page 68 does not include
page 42.
page 43 for details.
3
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