2-12
IM WT310E-02EN
• To make the protective features effective, before applying the voltage or current from the
circuit under measurement, check that:
• The power cord for the instrument is being used to connect to the power supply, and
the instrument is grounded.
• The instrument is turned on.
• The current input protection cover provided with the instrument is attached.
• When the instrument is turned on, do not apply a signal that exceeds the following values
to the voltage or current input terminals. When the instrument is turned off, turn the circuit
under measurement off. For information about other input terminals, see the specifications
in chapter 6.
Instantaneous maximum allowable input (within 20 ms)
Voltage input
Peak value of 2.8 kV or rms value of 2 kV, whichever is less.
Current input
Direct input
• WT310E and WT332E/WT333E
When the crest factor is 3: 0.5 A to 20 A range
When the crest factor is 6 or 6A: 0.25 A to 10 A range
Peak value of 450 A or rms value of 300 A, whichever is less.
• WT310E
When the crest factor is 3: 5 mA to 200 mA range
When the crest factor is 6 or 6A: 2.5 mA to 100 mA range
Peak value of 150 A or rms value of 100 A, whichever is less.
• WT310EH
When the crest factor is 3: 1 A to 40 A range
When the crest factor is 6 or 6A: 0.5 A to 20 A range
Peak value of 450 A or rms value of 300 A, whichever is less.
External current sensor input
Peak value less than or equal to 10 times the range.
Instantaneous maximum allowable input (1 s or less)
Voltage input
Peak value of 2 kV or rms value of 1.5 kV, whichever is less.
Current input
Direct input
• WT310E and WT332E/WT333E
When the crest factor is 3: 0.5 A to 20 A range
When the crest factor is 6 or 6A: 0.25 A to 10 A range
Peak value of 150 A or rms value of 40 A, whichever is less.
• WT310E
When the crest factor is 3: 5 mA to 200 mA range
When the crest factor is 6 or 6A: 2.5 mA to 100 mA range
Peak value of 30 A or rms value of 20 A, whichever is less.
• WT310EH
When the crest factor is 3: 1 A to 40 A range
When the crest factor is 6 or 6A: 0.5 A to 20 A range
Peak value of 150 A or rms value of 44 A, whichever is less.
External current sensor input
Peak value less than or equal to 10 times the range.
2.5 Precautions When Wiring the Circuit under Measurement
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