HP 1660CS-Series User Manual page 244

System Performance Analysis (SPA) Software
Using State Overview, State Histogram, and Time Interval
Interpreting the histogram display Press the blue Shift key and Run
to start the State Overview acquisition. As the data is sampled and
sorted, the buckets along the X axis will accumulate (item 3 in the figure
on the previous page). The relative size of the vertical bars show the
distribution of activity on the label you chose. The analyzer will continue
to sample, sort the data, and update the display until you press Stop or
until you change a display variable.
Max count (item 4 in the figure on the previous page) represents the current
upper limit of the Y axis for the bucket with the greatest number of data
samples. Max count for the limit of the Y axis will increase as the buckets fill
with samples.
Read Total count (item 5 in the figure on the previous page) to find the total
number of samples taken over the specified range of the label. This is not
affected by the low and high values.
Using the markers To find the number of data samples in any bucket,
select the X marker or O marker field (item 6 in the figure on the
previous page). Turn the knob to move the marker to the area of interest.
Read the X Mark count or O Mark count values to determine the number
of samples in the current bucket (item 7 in the figure on the previous
page).
As you move either marker across the display, the value in the X Marker or
O Marker pop-up will change. The amount of change of the marker's value
represents the size of the bucket.
Zooming in on an area of interest When viewing the State Overview
display, you may see areas of high activity and areas of little or no
activity. To zoom in on one of these areas for more resolution, put the X
and O markers on the boundaries of the area, then adjust the low and
high values to match the X and O marker positions.
8-23