10-19
IM 253710-01E
Numerical Computations
10
Explanation
The numerical data can be exponentially averaged using the specified attenuation
constant.
Turning ON/OFF the averaging function
Select whether or not to perform the specified averaging function.
• OFF : Does not perform the averaging function.
• ON : Performs the averaging function.
The averaging is performed according to the following equation.
(M
n
– D
n–1
)
K
D
n
=
D
n–1
+
D
n
: Displayed value at the nth time that has been exponentially averaged. (The
displayed value D
1
on the first time is M
1
.)
D
n–1
: Display value at the n–1st time that has been exponentially averaged.
M
n
: Measured data at the nth time.
K : Attenuation constant (see “Setting the attenuation constant.”)
• Measurement functions that are averaged
The measurement functions that are directly averaged are shown below. Other
functions that use these functions in their computation are also affected by the
averaging. For details regarding the determination of each measurement function,
see Appendix 2.
• For the normal measurement mode
Urms, Irms, Umn, Imn, Udc, Idc, P
• For the harmonic measurement mode
U(k), I(k), P(k), Q(k)
* k : harmonic order
Setting the attenuation constant
Select the attenuation constant from 2, 4, 8, 16, 32, and 64.
Note
•
The following measurement functions are not affected by averaging.
•
For the harmonic measurement mode
fU, fI, U+pk, U-pk, I+pk, I-pk
•
For the harmonic measurement mode
φ
U(k),
φ
I(k),
φ
U1-U2,
φ
U1-U3,
φ
U1-I1,
φ
U1-I2,
φ
U1-I3
* k : harmonic order
•
If the data acquisition is stopped while averaging is in progress and the acquisition is
restarted, the averaging process continues.
•
Averaging cannot be turn [ON] when the user-defined function is turned [ON] or when the
[Mode] of the waveform computation (see section 11.2) is [ON] and either [Math1] or [Math2]
is [ON].
10.5 Averaging