1-6
IM 704210-01E
Calculation
≡
For operating procedure, refer to 7.1 and 7.7
≡
The following functions are available to select/set parameters required for statistical computation.
Selecting the calculation area
This function allows the user to select whether to carry out statistical computation using the
measured values present in the entire window of a histogram or using those present within the
area enclosed by the markers.
Setting the constant
This function allows the user to set the constant T to be used for calculation of jitter 1 (
σ
/T) or
jitter 2 (|AVE - X
center
| / T) or the one to be used for measurement of pulse width (22T).
Statistical Computation Items
≡
For operating procedure, refer to 7.1 and 7.8
≡
Statistical computation can be carried out using measured values. Computation results can be
displayed if histogram or statistic display format is selected (see 1.6). The entire area of a
histogram (i.e. entire window area) or the area enclosed by the X1 and X2 markers can be used as
the calculation area. The formula may differ depending on the sampling mode.
Time stamp mode
In the following formulas, “n” indicates the number of samples and X
i
indicates the measured
value for each sample.
• Maximum value (MAX)
Indicates the largest value among the measured values.
M AX = [X
i
]
max
• Minimum value (MIN)
Indicates the smallest value among the measured values.
M I N= [X
i
]
m in
• Average value (AVE)
Calculates the average of the measured values.
AVE =
1
n
Σ
i = 1
n
X
i
• Standard deviation (
σ
σ
σ
σ
σ
)
Calculates the standard deviation of the measured values. Standard deviation indicates degree of
dispersion.
σ
=
1
n
Σ
(
i =1
n
X
i
– AVE)
2
• Peak to peak (P-P)
Calculates the difference between the maximum and minimum values.
P – P = MAX – M IN
• Flutter (
σ
σ
σ
σ
σ
/AVE)
Calculates flutter. Flutter indicates degree of dispersion in percentage in relation to the average
value.
σ
/ AVE =
σ
AVE
×
1 0 0 ( % )
1.4 Computation
