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IM 253401-01E
4.3 Selecting the Measurement Range in case of Direct Input
Range up:
A higher range is selected immediately if the instantaneous input voltage or current exceeds
approx. 300% of the rated value during sampling. If the meaured voltage or current exceeds
110% of the rated value, a higher range will be selected at the end of the current
measurement cycle.
Range down:
A lower range is selected if the measured voltage or current drops below 30% of the rated
value. However, even when the measured voltage or current drops below 30% of the rated
value, range down will not be done when this would result in waveforms with a high crest
factor causing peak over.
Verifying the Range
To verify the current range setting press the V RANGE key or the A RANGE key. The result
will be shown at display C. In order to return to the measurement status, press the same key
again.
Note
• When the range is set to auto, you cannot move to the minimum range by pressing the ∧ key. On the
other hand, when the range is set to the minimum, you cannot move to auto range by pressing the ∨ key.
• When the range is set to auto, the range may be adjusted frequently if a waveform such as a pulse is
input. In such a case, set the range manually.
Power Range
The measuring range for active power, apparent power and reactive power is determined as
follows.
Wiring method
single-phase, two-wire (1Φ2W)
single-phase, three-wire (1Φ3W)
three-phase, three-wire (3Φ3W)
three-voltage, three-current (3A3V)
three-phase, four-wire (3Φ4W)
The maximum display is 9999.
When the result of "voltage range × current range" exceeds 1000W, the unit on the display will
change to "kW"; When this result exceeds 1000kW, the unit on the display will change to MW.
Note
When the range is set to auto, the measuring range switches according to range up/range down
conditions. Therefore, the range may vary even if the measured values remain the same.
Power range
voltage range × current range
voltage range × current range × 2
voltage range × current range × 3
4
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