YOKOGAWA WT1800 User Manual page 38

• To make the protective features effective, before applying the voltage or current from the
circuit under measurement, check that:
• The power cord provided with the instrument is being used to connect to the power
supply and that 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 4 kV or rms value of 2 kV, whichever is less.
Current input
Direct input
5 A input elements
Peak value of 30 A or rms value of 15 A, whichever is less.
50 A input elements
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 3 kV or rms value of 1.5 kV, whichever is less.
Current input
Direct input
5 A input elements
Peak value of 10 A or rms value of 7 A, whichever is less.
50 A input elements
Peak value of 150 A or rms value of 55 A, whichever is less.
External current sensor input
Peak value less than or equal to 10 times the range.
Continuous maximum allowable input
Voltage input
Peak value of 2 kV or rms value of 1.1 kV, whichever is less.
Current input
Direct input
5 A input elements
Peak value of 10 A or rms value of 7 A, whichever is less.
50 A input elements
Peak value of 150 A or rms value of 55 A, whichever is less.
External current sensor input
Peak value less than or equal to 5 times the range.
IM WT1801-03EN
2.5 Precautions When Wiring the Circuit under Measurement
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App
Index
2-9