4-148 Analysis Menu
SR785 Dynamic Signal Analyzer
original View or define new segments in the new View. Limit testing is not available for
Nyquist or Nichols views.
Measurement data is compared with the limits only over the range of X values for which
Limit Segments have been defined. Segments do not have to cover the entire display
span or connect with each other. Only segments or the portions of segments within the
measurement span are tested. Limits outside the measurement span are ignored.
The test result is shown in the display (to the left of the graph). An audible alarm may be
sounded when a test fails.
Marker Stats
Display the Marker Statistics menu.
The Marker Statistics menu displays various statistics about the marker Y values
including Mean, Max, Min and Standard Deviation.
When Marker Statistics are On, the various statistical quantities are updated whenever
new data is available on the display. The accumulation of the statistical quantities
continues even when this menu is not displayed. Return to this menu to see the latest
statistical values.
Exceedance Stats
Display the Exceedance Statistics menu.
This menu is used to calculate L
n
(exceedance centile) from Octave or FFT
measurements stored in the waterfall buffer. The calculation of L
n
requires that the active
display have records stored in the waterfall buffer. The display must be paused or done
with a 1-shot waterfall. Waterfall display is not required to be on. The save option must
be set to Active Measurement Only to calcucalte exceedance.
L
n
is the amplitude at each bin which is exceeded by n% of the records in the waterfall.
L
1
is a large amplitude exceeded only 1% of the time. L
99
is a small amplitude exceeded
by 99% of the measurements.
The range of records within the waterfall buffer which are analyzed is specified by the
Start and Stop index. The Exceedance Pct sets the centile (1-99).
Press <Calculate Excd> to start the calculation. The result is stored in a data trace and
has the same measurement type as the waterfall measurements. To view the result, recall
the trace to a display or reference graph.
Curve Fit
Display the Curve Fit/Synthesis menu.
Summary of Contents for SR785
Page 4: ...ii ...
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Page 80: ...1 64 Exceedance Statistics ...
Page 158: ...2 78 Curve Fitting and Synthesis SR785 Dynamic Signal Analyzer ...
Page 536: ...5 136 Example Program SR785 Dynamic Signal Analyzer ...