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O
PERATOR
’
S
M
ANUAL
WRXi-OM-E Rev B
93
hist
rms
Histogram
Root
Mean
Square
Definition:
The rms value of the values in a histogram.
Description:
The center value of each populated bin is squared and multiplied by the population (height) of
the bin. All results are summed and the total is divided by the population of all the bins. The
square root of the result is returned as hrms.
Example:
Using the histogram shown here, the value for hrms is:
hrms =
= 2.87
hist
top
Histogram
Top
Definition:
The value of the rightmost of the two most populated peaks in a histogram. This parameter is
useful for waveforms with two primary parameter values, such as TTL voltages, where htop
would indicate the binary `1' voltage value.
Description:
The two highest histogram peaks are determined. The rightmost of the two identified peaks is
then selected. The center of that peak is htop (center is the horizontal point where the population
to the left is equal to the area to the right).
Example: