Agilent Technologies 8133A Servisní příručka stáhnout pdf (Strana 55)

Testing Performance 3

16800 Series Portable Logic Analyzers Service Guide 55

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

Now test the logic analyzer using complement data.

1 On the 8133A pulse generator, in the PULSE setup for

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.

3 Verify the DC offset and adjust it if necessary. See

page 41.

4 Deskew the oscilloscope if necessary. See page 42.

5 Adjust the oscilloscope’s measurement markers to

measure the pulse width. Set the markers so that

∆=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 page 43 for details.

NOTE

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" on page 68 does not include

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.

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Agilent Technologies 8133A Servisní příručka Strana 55