SDA Operator’s Manual
Parameter Description Definition Notes
Skew Time of clock1 edge minus time of
nearest clock2 edge.
Reference levels and edge-
transition polarity can be
selected. Hysteresis argument
used to discriminate levels
from noise in data. Hysteresis
on a measurement (if set to
500 mdiv) requires that the
signal must transition one way
1/2 division (total swing)
across the threshold for the
measurement to be valid.
Available with JTA2 and
XMAP options.
Standard in SDA100G and
WaveSurfer scopes.
Slew Rate Slew rate or local dV/dt in a
transition zone
Available in SDA and JTA2
options.
Standard in SDA100G scopes.
SSC Diff Calculates difference between
average SSC frequencies.
Available with PCIE option.
SSC Frequency Frequency of Spread Spectrum
Clock signal.
Available with PCIE option.
SSC Ratio Calculates the ratio between the
maximum and minimum SSC
frequencies.
Available with PCIE option.
SSC Track Tracks Spread Spectrum Clock.
Filtered track of frequency at level.
Available with ASDA option.
Std dev Standard deviation of the data
between the cursors - about the
same as rms for a zero-mean
waveform.
Gives similar result when
applied to time domain
waveform or histogram of data
of same waveform. But with
histograms, result may include
contributions from more than
one acquisition.
Where: v
i
denotes measured
sample values, and N =
number of data points within
the periods found up to
maximum of 100 periods.
Standard parameter.
TAA Average peak-to-trough amplitude
for all local features.
Hysteresis argument used to
discriminate levels from noise
in data.
Available with DDM2 option.
Standard in DDA-5005A.
SDA-OM-E Rev H 173
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