YOKOGAWA WT500 - Wiring the Circuit that You will Measure with a Current Sensor

3-17
IM 760201-01E
Before You Start Measuring
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Index
3.10 Wiring the Circuit That You Will Measure with a
Current Sensor
To avoid electric shock and damage to the instrument, follow the precautions given in
section 3.5, “Precautions for Wiring the Circuit That You Will Measure.”
If the maximum current value of the circuit under measurement exceeds the maximum
range of the current input terminal, 40 Arms, you can measure the current by connecting
an external sensor to the current sensor input connector.
Current sensor output type
• In the wiring example in this section, you can use a shunt resistor or a clamp-type
current sensor as the external current sensor.
•
When using a clamp-type current sensor that outputs current, see section 3.11.
Connecting to the Input Terminal
Voltage Input Terminal
The terminal is a
f
4-mm safety banana jack (female).
Insert the safety terminal (the conductive parts are not exposed) into the voltage input
terminal.
If you are using the 758931 Safety Terminal Adapter that comes with the package, see
section 3.6.
External Current Sensor Input Terminal
Connect an external sensor cable with a BNC connector (B9284LK, sold separately) to
an external current sensor input connector.
Remove the measurement cable connected to the current input terminal. Because the
current sensor input terminal and the current input terminal are connected internally,
connecting both terminals simultaneously not only results in measurement errors but may
also cause damage to the instrument.
In addition, when the voltage of the circuit under measurement is being applied to the
current sensor input terminal, do not touch the current input terminals. Doing so is
dangerous because the terminals are electrically connected inside the instrument.
Number of Installed Input Elements and Wiring Systems
The selectable wiring systems vary depending on the number of input elements that are
installed in the WT500. For details, see “Number of Installed Input Elements and Wiring
Systems” in section 2.3, “Measurement Conditions.”