LeCroy DDA 7 Zi series, Operator'S Manual

Page: 299 / 544

Operator's Manual
WP700Zi-OM-E-RevA
298
DISPLAY TYPE VALUE DISPLAYED
(spaces) that are preceded and followed by the specified space (pits) for the last
acquisition.
Histogram
Function
Histogram graph of the values of the beginning and ending edge shift calculated for all
subject pits (spaces) that are preceded and followed by the specified space (pits) for all
acquisitions since the last CLEAR SWEEPS operation.
Trend
Function
Trend graph of the value of the beginning and ending edge shift calculated for all subject
pits (spaces) that are preceded and followed by the specified space (pits) for all
acquisitions since the last CLEAR SWEEPS operation.
XY Plot XY Plot displays the trend of one parameter vs. another.
Dp2c - DELTA PIT TO CLOCK
Description
Dp2c provides a measurement of the time between the leading edge of the pit (or spaces of interest) and the
nearest specified clock edge. The measurement is calculated between the points where the data and clock
signals cross selected voltage thresholds.
The value calculated depends on the clock and data edges selected, as shown in the table below. If in the Data
Slope menu Pos (positive) is selected, the measurement is performed from the leading edges of positive polarity
pits. If Neg (negative) is selected, the measurement is performed from the leading edges of negative polarity
spaces. And if Both is selected, the leading edges of both pits and spaces are used in the calculation. The sizes
of pits or spaces used in the measurement are also determined by the range of ‘nT’ values chosen.
CLOCK
EDGE
DATA SLOPE
Pos Neg Both
positive
time between leading edge of
positive polarity pit and
nearest positive clock edge time between leading edge of
negative polarity space and
nearest positive clock edge time between leading edge
of pits and spaces to nearest
positive clock edge
negative
time between leading edge of
positive polarity pit and
nearest negative clock edge time between leading edge of
negative polarity space and
nearest negative clock edge time between leading edge
of pits and spaces to nearest
negative clock edge
near
time between leading edge of
positive polarity pit and
nearest clock edge time between leading edge of
negative polarity space and
nearest clock edge time between leading edge
of pits and spaces and
nearest clock edge
For the positive polarity pit example shown as the zoom of the measurement (next two figures), the
measurements t , t-, tn are for a single Delta Pit-to-Clock measurement configured for positive edge, negative
edge, or nearest edge, respectively.
Figure 5-8. Delta Pit-to-Clock measurement