HP 1660CS-Series User Manual page 226

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The Y axis is the relative number of occurrences in each bucket.
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Maximum value of the Y axis is constantly updated to reflect the number
of occurrences in the bucket that has the most occurrences, and is
displayed as "Max count."
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The total number of states sampled for the selected label is presented as
Total count. This includes states that may be outside the user-specified
X axis range.
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Two markers are available on the X axis to determine the range of a
bucket and number of occurrences in any bucket.
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Choice of base for a specified label is user-definable.
State Histogram The State Histogram mode displays states that occur
within user-defined ranges of a label. State Histogram is available on any
label defined in the Format Specification.
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Maximum number of ranges is 11.
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Other States included/excluded is available and displays a histogram of all
states not covered by the user-defined ranges.
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You can tTrace All States or pattern Qualified States.
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Total samples displays the total number of occurrences in all displayed
ranges.
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Choice of base for specified label is user-definable.
Time Interval The Time Interval mode displays time intervals between
user-defined start and end events.
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Start and end events can be defined over all labels defined in the Format
Specification.
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10 ns is the minimum sample period and time interval resolution.
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The maximum number of time interval ranges is 8.
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Time interval range size is 10 ns to 9,999,999 seconds.
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Calculated statistics provides Maximum time, Minimum time, Average
time, and Total number of time intervals sampled (one time interval
defined to be a paired start/end event).
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Auto-range feature automatically scales the eight time intervals over
maximum and minimum times using a logarithmic scale or linear scale.
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Choice of base for labels is user-definable.
System Performance Analysis (SPA) Software
What is System Performance Analysis?
8-5