16-5
IM 760401-01E
Specifications
16
16.3 Functions
Voltage, Current, and Active Power Measurements
Item Specifications
Measurement method Digital sampling method, summation averaging method
Crest factor 3 or 6
Wiring system WT210 (single-phase model, 760401)
Single-phase, two-wire (1P2W)
WT230 (three-phase, three-wire model, 760502)
Select from single-phase, two-wire (1P2W); single-phase, three-wire (1P3W); and three-phase,
three-wire (3P3W)
WT230 (three-phase, four-wire model, 760503)
Select from single-phase, two-wire (1P2W); single-phase, three-wire (1P3W); three-phase,
three-wire (3P3W); three-phase, four-wire (3P4W); and three-voltage, three-current (3V3A).
Range switching Select fixed range or auto range.
Auto range Step up
When the measured value exceeds 130% of the rated range or the peak value exceeds
approximately 300% (Approx. 600% if the crest factor is set to 6) of the rated range. For the
WT230, when the condition is met on any of the input elements.
Step down
Range down: When the measured value becomes less than 30% of the rated range and the
peak value is less than 300% (Less than or equal to 600% if the crest factor is set to 6) of the
subordinate range. For the WT230, when the condition is met on all input elements.
Measurement mode Select from RMS (the true RMS value of voltage and current), VOLTAGE MEAN (the rectified mean
switching value calibrated to the RMS value of the voltage and the true RMS value of the current), DC (simple
average of voltage and current).
Measurement Select voltage, current, or the entire period of the display update rate for the signal used to achieve
synchronization source synchronization during measurement.
Line filter Select OFF or ON (cutoff frequency of 500 Hz).
Peak measurement Measures the peak value of voltage or current from the instantaneous voltage or instantaneous
current that is sampled.
Zero-level compensation Creates a zero input condition inside the WT210/WT230 and sets the level at that point as the zero
level.
Frequency Measurement
Item Specifications
Measured item WT210 (single-phase model, 760401)
Select voltage (V) or current (A).
WT230 (three-phase, three-wire model, 760502)
Select voltage of input element 1 (V1), voltage of input element 3 (V3), current of input element 1
(A1), or current of input element 3 (A3).
WT230 (three-phase, four-wire model, 760503)
Select voltage of input element 1 (V1), voltage of input element 2 (V2), voltage of input element 3
(V3), current of input element 1 (A1), current of input element 2 (A2), or current of input element
3 (A3).
Method Reciprocal method
Frequency measuring range
Varies depending on the display update period (see description given later) as follows.
Display Update Rate Measurement Range
0.1 s 25 Hz to 100 kHz
0.25 s 10 Hz to 100 kHz
0.5 s 5 Hz to 100 kHz
1 s 2.5 Hz to 100 kHz
2 s 1.5 Hz to 50 kHz
5 s 0.5 Hz to 20 kHz
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