Measurement Setup
27
3.10 Index averaging
𝐷
𝑛
= 𝐷
𝑛−1
+
𝑀
𝑛
− 𝐷
𝑛−1
𝑘
𝐷
𝑛
The value displayed after the nth index averaging, (
𝐷
1
, the value displayed after the first averaging,
is equal to M1)
𝐷
𝑛−1
The value displayed after the (n-1)th index averaging
𝑀
𝑛
the nth measured data.
𝑘
attenuation constant (1-64)
Table 3.2
3.11 Linear averaging
𝐷
𝑛
=
𝑀
𝑛−(𝑚−1)
+ … + 𝑀
𝑛−2
+ 𝑀
𝑛−1
+ 𝑀
𝑛
𝑚
𝐷
𝑛
linear average of m values from the
(𝑛 − (𝑚 − 1))
𝑡ℎ
to
𝑛
𝑡ℎ
value
𝑀
𝑛−(𝑚−1)
(𝑛 − (𝑚 − 1))
𝑡ℎ
measured data
𝑀
𝑛−2
(𝑛 − 2)
𝑡ℎ
measured data
𝑀
𝑛−1
(𝑛 − 1)
𝑡ℎ
measured data
𝑀
𝑛
𝑛
𝑡ℎ
measured data
𝑀
the number of average values (1-64)
Table 3.3
When m can be divided exactly by n, the calculated value is the moving average; when there is no particular relationship
between m and n, the calculated value is the repeated average.
Note:
When index averaging is set, averaging is implemented under the harmonic measurement function.When linear
averaging is set, averaging can only be implemented in the conventional measurement function and this mode is not
applicable to the harmonic measurement function.
The following measurements are subject to direct averaging:
1. Urms, Umn, Udc, Urmn, Uac, Irms, Imn, Idc, Irmn, Iac, P, S and Q.
2. Ucf, Icf,
𝜆
and WPAV are calculated by operation of the averaged Urms, Irms, P and S.
3.12 Harmonic measurement averaging
The following measurement functions are subject to direct averaging:
1. U(k), A(k),W(k), S(k) and Q(k).
2.
𝜆(𝑘)
is calculated via operation of the averaged W(k) and Q(k).
3. U(%r), A(%r), W(%r) , U(%f), A(%f) and W(%f) are calculated via operation of the averaged U(k), A(k) and W(k).
(k indicates the harmonic times.)
