286
The figure below shows an eye-diagram and the areas from which values are taken that are used to
calculate measurements.
P Values
The P values include the mean and standard deviation of the vertical location of PTop and PBase.
These areas are used with a specified sample size to statistically measure the following values:
PTop
mean
, the mean value of PTop
PTop
sigma
, the standard deviation of PTop
PBase
mean
, the mean value of PBase within the Eye Aperture
*
PBase
sigma
, the standard deviation of PBase within the Eye Aperture
*
*
The Eye Aperture defaults to the center 20 % of the interval from TCross
1
to TCross
2
.
T1 Values
The T1 values are vertical and horizontal values associated with the leftmost crossing point. These
areas are used to establish the following values:
TCross1
mean
, the horizontal mean of the left crossing point at TCross
1
TCross1
sigma
, the horizontal standard deviation of the left crossing point at TCross
1
TCross1
pk-pk
, the horizontal peak-to-peak deviation of the left crossing point at TCross
1
PCross1mean, the vertical mean of the left crossing point at PCross
1
T2 Values
The T2 values are vertical and horizontal values associated with the rightmost crossing point.
These areas are used to establish the following directions:
TCross2
mean
, the horizontal mean of the right crossing point at TCross
2
TCross2
sigma
, the horizontal standard deviation of the right crossing point at TCross
2
TCross2
pk-pk
, the horizontal peak-to-peak deviation of the right crossing point at TCross
2
DCD Values
The duty cycle distortion (DCD) values are horizontal values associated with the rightmost
crossing point at 50% of the eye height. These areas are used to establish the DCDpk-pk, the
horizontal peak-to-peak deviation of the left crossing point at half the height of the eye.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
