Fluke 8588A Operator's Manual page 96

8588A/8558A
Operators Manual
 (Auto): The horizontal axis shows the number of bins based on the
number of measurements in the data record and the noise level of the input.
Typically, the number of bins increases with more measurements, where 100
measurements may give 7 bins, while 1000 measurements may give 11 bins.
Auto implicitly assumes a normal distribution.
 (Manual): For a different view of the measurement value, choose the
 (Manual) setting. The Manual menu # Bins sets the horizontal axis, up to
100 bins. The bin horizontal axis can be specified as either Low and High values,
or as a Span around a Center value.
Histogram using similar data records, with Auto or Manual horizontal scale
settings are shown below:
92
iei042.png
iei043.png