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4-26 IM 760301-01E

• Setting the Attenuation Constant

• Harmonic Measurement in Normal Measurement Mode

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).

• Wide Bandwidth Harmonic Measurement Mode

When averaging is turned ON, exponential averaging is performed using the

attenuation constant that you select from 2, 4, 8, 16, 32, and 64.

• IEC Harmonic Measurement Mode

You cannot select the attenuation constant. Averaging is performed using the

attenuation constant that is defined by the standard.

• 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 the

averaging. For details regarding the determination of each measurement function, see

appendix 1.

• U(k), I(k), P(k), S(k), and Q(k)

• λ(k) and

(k) are computed from the averaged P(k) and Q(k).

• Z, Rs, Xs, Rp, Xp, Uhdf, Ihdf, Phdf, Uthd, Ithd, Pthd, Uthf, Ithf, Utif, Itif, hvf, and hcf

* k: harmonic order

Note

• When averaging is turned ON, the average value of multiple measurements is determined

and displayed. Therefore, if the input signal changes steeply, the response for the measured

value to follow up on the change is slow.

• The larger the value of the attenuation constant of exponential averaging or the average

count of moving average, the more stable the measured value (response to the input change

is slow).

• The following measurement functions are not affected by averaging.

• Measurement functions of normal measurement

fU, fI, U+pk, U-pk, I+pk, I-pk, Time, WP, WP+, WP-, WPS, WP+S, WP-S, and SyncSp

(models with the motor evaluation function)

• Measurement functions of harmonic measurement (option)

φU(k), φI(k), φUi-Uj, φUi-Uk, φUi-Ii, φUi-Ij, and φUi-Ik

* k: harmonic order

Measurement Functions of Voltage Fluctuation and Flicker Measurement Mode and

Cycle-by-Cycle Measurement Mode

Averaging is not performed. The average setting is invalid.

4.9 Selecting the Averaging Function

YOKOGAWA wt3000 User Manual

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