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2-6
IM 760301-01E
Types of Measurement Functions during Normal Measurement
The data (numeric data) of measurement functions is measured or computed from the
sampled data
*1
described in “Measurement Period” on page 2-7.
*1 The WT3000 samples the instantaneous values of the voltage and current signals at a
specified sample rate
*2
. The sampled data is processed as numeric data or data used to
display waveforms on the screen (waveform display data).
*2 Sample rate represents the number of data points that are sampled within 1 s. For example,
at a sample rate of 200 kS/s, 200000 data points are sampled every second.
• Types of Measurement Functions
• Measurement Functions on Each Input Element
The following 22 measurement functions are available. For details related to the
determination of measurement function data, see “Appendix 1.”
U (voltage Urms, Umn, Udc, Urmn), I (current Irms, Imn, Idc, Irmn), P (active
power), S (apparent power), Q (reactive power), λ (power factor), φ (phase
difference), fU/fI (also expressed as fU: FreqU and fI: FreqI, measures the
frequencies of up to two voltage/current signals
*3
), U+pk/U-pk (maximum/minimum
values of voltage), I+pk/I-pk(maximum/minimum values of current), CfU/CfI(crest
factor of voltage/current), Pc (Corrected Power)
*3 The frequencies of voltage and current on all input elements can be measured on models
with the frequency measurement add-on option.
• Measurement Functions of Wiring Units
Σ
A and
Σ
B (
Σ
Functions)
The following 14 measurement functions are available. For details related to the
determination of measurement function data, see “Appendix 1.”
U Σ (voltage average Urms Σ , Umn Σ , Udc Σ , Urmn Σ ), I Σ (current average Irms Σ ,
Imn Σ , Idc Σ , Irmn Σ ), P Σ (sum of active powers), S Σ (sum of apparent powers), Q Σ
(sum of reactive powers),
λΣ
(power factor average),
φΣ
(phase difference
average), Pc Σ (sum of corrected powers)
• Efficiency (
Σ
Functions), User-Defined Function
Four efficiency functions η 1 to η 4 are available. 20 user-defined functions, F1 to
F20, are available. See section 2.5.
• Measurement Functions of Integration
See section 2.6.
• Delta Computation (Option)
Four delta functions, ∆ F1 to ∆ F4, are available. See the
Expansion Function User’s
Manual IM760301-51E .
Types of Measurement Functions for Harmonic Measurement (Option)
Harmonics can be measured on models with the advanced computation (/G6) option.
Harmonic measurement consists of three types: harmonic measurement in normal
measurement mode, wide bandwidth harmonic measurement, and IEC harmonic
measurement. In addition, the rms voltage and current consist of two types: normal
measurement value and total value. For details, see the Extension Function User’s
Manual IM760301-51E .
2.2 Measurement Modes and Measurement Functions