Agilent Technologies 8133A Servisní příručka stáhnout pdf (Strana 61)

Testing Performance 3

16800 Series Portable Logic Analyzers Service Guide 61

Determine and set eye finder Position (500 Mb/s mode)

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

CHANNEL 2, press the COMP button to return the

outputs to normal.

2 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 Verify the oscilloscope Deskew and adjust if necessary.

See page 42.

5 Adjust the measured pulse width from the pulse generator

to 1.5 ns (minus the test margin) as described on

page 43.

Do not change the pulse generator frequency yet.

6 Select the Sampling tab.

7 Click Thresholds and Sample Positions.... A dialog appears

telling you that acquired data will be erased. Select the

Yes button, erasing acquired data.

8 In the Thresholds and Sample Positions dialog, expand

“My Bus 1”.

9 If the blue bars are not vertically aligned, align them. See

page 49.

10 Grab the blue bar for “My Bus 1” and move it to

approximately 600 ps. All blue bars will follow.

11 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

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 187 188

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Agilent Technologies 8133A Servisní příručka Strana 61