YOKOGAWA WT210 User Manual page 54

IM 760401-01E
• When using a clamp-type current sensor as an external current sensor, have a
good understanding of the voltage of the circuit under measurement and the
specifications and handling of the clamp-type sensor. Then, confirm that there
are no shock hazards.
• For safety reasons, when using the instrument on a rack mount, furnish a switch
for turning OFF the circuit under measurement from the front side of the rack.
• After connecting the measurement cable, attach the current input protection
cover for your safety. Make sure that the conductive parts are not exposed from
the protection cover.
• To make the protective functions effective, check the following items before
applying the voltage or current of the circuit under measurement.
• The power cable provided with the instrument is used to connect to the power
supply and the instrument is grounded.
• The power switch of the instrument is turned ON.
• The current input protective cover provided with the instrument is being used.
• When the power switch of 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 OFF the circuit under measurement.
For other input terminals, see the specifications of each module in chapter 16.
Instantaneous Maximum Allowable Input (1 period, for 20 ms)
Voltage Input
Peak value of 2.8 kV or RMS value of 2.0 kV, whichever is less.
Current Input
5 mA to 200 mA range (2.5 mA to 100 mA range if the crest factor is set to 6) (WT210
only)
Peak value of 150 A or RMS value of 100 A, whichever is less.
0.5 A to 20 A range (0.25 A to 10 A range if the crest factor is set to 6) (common to
WT210 and WT230)
Peak value of 450 A or RMS value of 300 A, whichever is less.
Continuous Maximum Allowable Input
Voltage Input
Peak value of 1.5 kV or RMS value of 1.0 kV, whichever is less.
Current Input
5 mA to 200 mA range (2.5 mA to 100 mA range if the crest factor is set to 6) (WT210
only)
Peak value of 30 A or RMS value of 20 A, whichever is less.
0.5 A to 20 A range (0.25 A to 10 A range if the crest factor is set to 6) (common to
WT210 and WT230)
Peak value of 100 A or RMS value of 30 A, whichever is less.
• The voltage rating across the input (voltage and current) and ground on the
WT230 varies depending on the operating conditions.
• When protection cover is attached to the GP-IB or serial interface and external
I/O connector
Voltage between input terminals and ground
• When protection cover is removed from the GP-IB or serial interface and
external I/O connector or when the connector is used
Voltage between CURRENT, ± (VOLTAGE input and CURRENT) input terminals
and ground
400 Vrms max.
Voltage between VOLTAGE input terminal and ground
600 Vrms max.
3.3 Wiring Precautions
600 Vrms max.
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