Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 91
Trace Menu
The Trace menu contains options that affect the way measurement data is processed and rendered as
traces on the graph.
Unlike the Edit menu options, the Trace options apply to all visible traces, rather than only the selected
plot, and they never alter the underlying measurement data. Most options on the Trace menu apply
only to a given measurement family – xDEV statistics, phase/frequency differences, or phase noise/AM
noise measurements. For example,
Trace → Averaging window for phase/frequency traces has no
effect on phase noise or Allan deviation traces.
The majority of Trace options are simple on/off toggles. In the Measurement → Phase difference ( p )
display, for instance, applying the Edit → Subtract global linear phase trend (frequency offset) ( Ctrl-o )
command to each visible trace would have the same visible effect as Trace → Show linear
phase/frequency residual ( r ) , as discussed below. But Trace → Show linear phase/frequency residual ( r )
does not actually subtract the trend from the phase record. Issuing the command again will restore
normal trace-rendering behavior.
Phase/frequency traces begin at zero ( z )
Show linear phase/frequency residual ( r)
These two commands can be used individually or together to maximize visible detail in
phase/frequency plots.
When enabled, Trace → Phase/frequency traces begin at zero ( z ) causes all phase- and
frequency-difference traces to be displayed with their first data point pinned to Y=0.0.
In unzoomed views – or in zoomed views with
Trace → Phase/frequency Y axis unlocked
in zoom mode ( y ) disabled to permit automatic Y-axis scaling – this will force the left
end of the trace to the midpoint of the graph’s Y axis. Since autoscaled Y axes in
TimeLab are symmetrical about zero, this may allow the trace to occupy more of the
visible graph area:
Figure 38: Toggling the zero-baseline view (z)