YOKOGAWA WT500 User Manual page 124

4.10 Selecting an Averaging Method
Measurement Functions Used in Harmonic Measurement (Optional)
4-28
Turning Averaging On or Off
• If averaging is turned on, and the averaging type is Exp (exponential averaging),
averaging is performed on harmonic measurement functions.
• Even if averaging is turned on, if the averaging type is Lin (moving average),
averaging is not performed on harmonic measurement functions.
Setting the Attenuation Constant
If averaging is turned on, and the averaging type is Exp (exponential averaging),
exponential averaging is performed using the selected attenuation constant (2, 4, 8, 16,
32, or 64).
Measurement Functions That Are Averaged
The measurement functions that are directly averaged are indicated below. Other
functions that use these functions in their computation are also affected by averaging.
For details about how each measurement function is determined, see appendix 1.
• U(k), I(k), P(k), S(k), and Q(k)
• λ(k), and f(k) are computed using P(k) and Q(k), which are both averaged.
• Uhdf, Ihdf, Phdf, Uthd, Ithd, and Pthd are computed using U(k), I(k), and P(k), which
are all averaged.
* k: The harmonic order
Note
• When averaging is turned on, the average value of multiple measurements is determined
and displayed. If the input signal changes drastically, it will take longer for the change to be
reflected in the measured values when averaging is used.
• A larger attenuation constant (for exponential averaging) or average count (for moving
averages) will result in more stable (and less responsive) measured values.
• The following measurement functions are not affected by averaging.
• Measurement Functions Used in Normal Measurement
fU, fI, U+pk, U-pk, I+pk, I-pk, Time, WP, WP+, WP-, WP
q+Σ, q-Σ
• Measurement Functions Used in Harmonic Measurement (Optional)
f f f
U(k), I(k), Ui-Uj,
* k: The harmonic order
f f f f
Ui-Uk, Ui-Ii, Ui-Ij, Ui-Ik
Σ Σ Σ
, WP+ , WP- , q, q+, q-, qΣ,
IM 760201-01E