6-12
IM WT5000-01EN
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 the values of the
measurement functions are determined, see appendix 1 in the Getting Started Guide, IM WT5000-03EN.
Measurement Functions Used in Normal Measurement
• Urms, Umn, Udc, Urmn, Uac, Irms, Imn, Idc, Irmn, Iac, P, S, Q, Ufnd, Ifnd, Pfnd, Sfnd, Qfnd, fU, fI, f2U, f2I
• ΔU1 to ΔPΣ (delta computation)
• Torque, Speed, Pm, Aux (models with the motor evaluation 1 or 2 option)
• λ, Φ, λfnd, Φfnd, CfU, CfI, Pc, q, q+, q–, and η1 to η4 are computed using the averaged values of Urms, Irms,
P, S, and Q.
• SyncSp is computed using the averaged value of fU or fI (models with the motor evaluation 1 or 2 option).
• Slip is computed using the averaged value of Speed (models with the motor evaluation 1 or 2 option).
Harmonic Measurement Functions
• U(k), I(k), P(k), S(k), Q(k)
• λ(k), and Φ(k) are computed using the averaged values of P(k) and Q(k).
• Z, Rs, Xs, Rp, Xp, Uhdf, Ihdf, Phdf, Uthd, Ithd, Pthd, Uthf, Ithf, Utif, Itif, hvf, hcf, and K–factor are computed
using the averaged values of U(k), I(k), and P(k).
k: The harmonic order
Measurement Functions That Do Not Perform Averaging
The following measurement functions do not perform averaging.
Measurement Functions Used in Normal Measurement
U+pk, U−pk, I+pk, I−pk, P+pk, P−pk, ITime, WP, WP+, WP−, WPΣ, WP+Σ, WP−Σ, WS, WQ
Harmonic Measurement Functions
ΦU (k), ΦI (k), ΦUi−Uj, ΦUi−Uk, ΦUi−Ii, ΦUj−Ij, ΦUk−Ik, fPLL1, fPLL2, EaM1U, EaM1I, EaM3U, EaM3I
* k: The harmonic order
Measurement Functions Used in Normal and Harmonic Measurement
F1 to F20, Event1 to Event8
• 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.
6 Computation and Output
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