PhaseStation 53100A User’s Manual V1.04 25-Apr-2022
95
As a reminder that averaging is in effect, nonzero averaging times will be displayed in red above
phase- and frequency-difference graphs. You can quickly disable averaging with the keyboard
sequence
g 0 <Enter>
.
Averaging also determines how phase records are decimated for display in the phase- and
frequency difference views. When rendering a trace whose phase record length in samples
exceeds the graph width in pixels, the samples that fall within each graph column must either be
peak-detected or combined by averaging. When the averaging window is set to zero seconds,
TimeLab effectively does both, using a “per-pixel” algorithm to provide as much information
about the skipped phase-record samples as possible. As shown in the first plot above, a shaded
vertical line is drawn in each pixel column that connects the minimum and maximum data
values that fall within that column. The darker portion of the trace in the middle of the shaded
area represents the average of
all
data points covered by each individual pixel column.
Consequently the effective averaging time is not fixed, but is equal to the duration of the visible
portion of the trace divided by the width of the graph in pixels.
This algorithm is simple, fast, and effective, but since the peak-detected line segments are
drawn in a lighter shade of the trace color, it’s easy to overlook brief glitches that fit within a
single pixel column. Consider enabling
Trace
→
Tick marks (
k
)
when looking for outliers in per-
pixel mode.
Draw xDEV traces with spline interpolation (
i
)
By default, screenspace points corresponding to the tau bins in Allan deviation and
related statistical views are connected with a cubic spline. Spline interpolation results in
a smooth, visually-appealing curve, but it can shift data points subtly, distort or
exaggerate ringing artifacts, and cause other abrupt transitions in the graph. When
Trace
→
Draw xDEV traces with spline interpolation (
i
)
is toggled off, straight lines are
used to connect the xDEV bins (above left).
Spline interpolation is not available when displaying MTIE plots.
Figure 43: Spline interpolation
Summary of Contents for PHASE STATION 53100A
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