IM 253401-01E
4-11
4
Setting Measurement Conditions
4.6 Using the Averaging Function
Explanation
About the Averaging Function
This function performs exponential averaging or moving averaging on measurement values.
When the displayed values are unsteady due to big fluctuations in power source or load, or due
to the low frequency of the input signal, this function is useful to stabilize the displayed values
for easier reading.
Selecting the Type of Averaging
The following two selections are available. The initial value is “Lin”.
• Exponential Averaging : EP
Exponential averaging is expressed by the following equation.
D
n
= D
n-1
+ (M
n
-D
n-1
)/K
where
D
n
: the value at the “n”th display;
D
n-1
: the exponentially averaged value at the “n-1”th display;
M
n
: the measurement value at the “n”th display;
K
: attenuation constant
• Moving Averaging: Lin
Moving averaging is expressed by the following equation.
D
n
= (M
n-(m-1)
+ M
n-(m-2)
+ ... M
n-2
+ M
n-1
+ M
n
)/m
where
D
n
: the value at the “n”th display;
M
n-(m-1)
: the measurement value at (m-1) display before the “n”th display;
M
n-(m-2)
: the measurement value at (m-2) display before the “n”th display;
:
M
n-2
: the measurement value at two displays before the “n”th display;
M
n-1
: the measurement value at one display before the “n”th display;
M
n
: the measurement value at the “n”th display;
m
: sample number
Setting the Averaging Sample Number/Attenuation Constant
The following selections are available. The attenuation constant (for exponential averaging) and
the sample number (for moving averaging) are set and saved seperately. The initial value is “8”.
Setting Averaging ON/OFF
Select the averaging menu once again after having set the averaging values. The initial value is
oFF.
• on : When this setting is selected, pressing the ENTER key will start averaging and the
AVG indicator will light.
• oFF : When this setting is selected, pressing the ENTER key will stop averaging and the
AVG indicator will extinguish.
