User Manual

CHAPTER 4. MEASUREMENT SETUP 23
D
n
The value displayed after the nth index averaging, (D
1
, the value
displayed after the rst 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)
4.4.2 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)
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.
When index averaging is set, averaging is implemented under the harmonic mea-
surement function.
When linear averaging is set, averaging can only be implemented in the conven-
tional 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.
4.4.3 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.)