YOKOGAWA wt3000 User Manual

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 ΣA and ΣB (Σ Functions)
The following 14 measurement functions are available. For details related to the
determination of measurement function data, see “Appendix 1.”
UΣ (voltage average UrmsΣ, UmnΣ, UdcΣ, UrmnΣ), IΣ (current average IrmsΣ,
ImnΣ, IdcΣ, IrmnΣ), PΣ (sum of active powers), SΣ (sum of apparent powers), QΣ
(sum of reactive powers), λΣ (power factor average), φΣ (phase difference
average), PcΣ (sum of corrected powers)
• Efficiency (Σ Functions), User-Defined Function
Four efficiency functions η1 to η4 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

YOKOGAWA wt3000 Specifications

General

Brand	YOKOGAWA
Model	wt3000
Category	Measuring Instruments
Language	English