Teledyne-lecroy AORM - Advanced Optical Recording Measurements Uživatelský manuál stáhnout pdf (Strana 55)

AORM Software Package

923133 Rev A ISSUED: June 2013 53

DISPLAY TYPE VALUE DISPLAYED

Parameter Statistics Off

All values of the overall edge shift for all pits/spaces within the

selected ‘nT’ range for last acquisition.

Parameter Statistics On

Average, minimum, maximum, and sigma of all edge shift

values calculated per acquisition for all acquisitions since the

last C

LEAR SWEEPS operation.

nT Table

List of values of the overall edge shift for each group of

pits/spaces of common ‘nT’ width for the last acquisition.

Histogram Function

Histogram of the single overall edge shift value calculated for

each acquisition for all acquisitions since the last CLEAR SWEEPS

operation.

Trend Function

Trend of the single overall Edge Shift value calculated for each

acquisition for all acquisitions since the last CLEAR SWEEPS

operation.

Example

The example shows the CD data signal measured at the selected voltage threshold containing, in

sequence, a 5T pit, 3T space, 3T pit and 4T space. If the clock period ‘T’ is 231.5 ns, then the 5T

and 4T edge shift value is simply the difference between the width calculated and the ideal width

(since there is only one pit/space of that ‘nT’ width), thus:

()

edgsh T

() .

4 920 4 2315

100%

2315

2 59%

5 1160 5 2315

100%

2315

108%

=−⋅ ⋅ =−

=−⋅⋅ =+

The 3T ed

ge shift value is the average difference:

()()

edgsh T()

690 3 2315

100%

2315

695 3 2315

100%

2315

086%=

−⋅ ⋅

⎛

⎝

⎜

⎞

⎠

⎟+ − ⋅ ⋅

⎛

⎝

⎜

⎞

⎠

⎟

In an nT Table display, these three values would be shown in the appropriate nT location.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 124 125

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