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5 Assign bits 2, 6, 10, and 14 of Pod 1.
6 Ensure that the Pod 1 threshold is set to 1 volt. See page 41.
Determine and set Eye Finder Position (500 Mb/s mode)
7 On the 8133A pulse generator, in the PULSE setup for CHANNEL 2, press
the COMP button to return the outputs to normal.
8 Change the oscilloscope's horizontal position to 725 ps (or as required) to
center the measured pulse on the oscilloscope display.
9 Verify the DC offset and adjust it if necessary. See page 36.
10 Verify the oscilloscope Deskew and adjust if necessary. See page 37.
11 Adjust the measured pulse width from the pulse generator to 1.5 ns
(minus the test margin) as described on page 39.
Do not change the pulse generator frequency yet.
12 Select the Sampling tab.
13 Select the Sampling Positions button. A dialog will appear telling you that
acquired data will be erased. Select the Yes button, erasing acquired data.
14 In the Eye Finder window, expand "My Bus 1".
15 If the blue bars are not vertically aligned, align them. See page 44.
16 Grab the blue bar for "My Bus 1" and move it to approximately
600 ps. All blue bars will follow.
17 Run Eye Finder and note the average sampling position chosen by Eye
Finder:______ps. In the following example, the average sampling position
is 600 ps. Note that in this step, you place the blue bars in the narrow
window (not the wide window) that appears just to the right of zero in the
Eye Finder display. Then run Eye Finder. The position may be different
based on your test setup. Bring stray channels into alignment if necessary.
Chapter 3: Testing Logic Analyzer Performance
Test Pod 1 in 500 Mb/s Mode
55
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