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3.3 Wiring Precautions
Connecting to the Input Terminal
3-6
Use measurement cables that have sufficient margin in withstand voltage and
current against the signal being measured. The cables must also have
insulation resistance that is appropriate for the ratings.
Example: When making measurements on a current of 20 A, use copper
wires that have a conductive cross-sectional area of 4 mm
• Voltage Input Terminal
The terminal is a φ4-mm safety banana jack (female).
Insert the safety terminal (the conductive parts are not exposed) into the voltage input
terminal.
• Current Input Terminal
• When the voltage of the circuit under measurement is being applied to the current
input terminals, do not touch the current sensor input terminals. Since these
terminals are electrically connected inside the instrument, this act is dangerous.
• When connecting measurement cables from an external current sensor to the
current sensor input connector, remove the cables connected to the current input
terminals. 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. Since these terminals are electrically connected inside the instrument,
this act is dangerous.
• The terminal is a binding post. The screws used on the terminal (binding post) are
M6 screws. Either wind the wire around the screw or pass the crimp-on lugs
through the screw axis, then tighten firmly by holding the terminal knob.
3.1
Note
•
On the WT230 (model: 760502, 760503), you must set the wiring system using the WIRING
key after wiring the circuit. For the procedure, see section 3.10, "Selecting the Wiring System."
•
When measuring large currents or voltages or currents that contain high frequency
components, take special care in dealing with mutual interference and noise when wiring.
•
Keep the measurement cables as short as possible to minimize the loss between the circuit
under measurement and the instrument.
•
The thick lines on the wiring diagrams shown in sections 3.7 and 3.9 are the sections where
the current flows. Use appropriate wires that are suitable for the current.
•
In order to make accurate measurements of the voltage of the circuit under measurement,
connect the cable to the circuit as close as possible.
•
In order to make correct measurements, separate the measurement cables as far away from
the earth ground wires and the instrument's case as possible to minimize the static
capacitance to earth ground.
•
To more accurately measure apparent power and power factor in three-phase unbalanced
circuits, we recommend the three-voltage three-current (3V3A) measurement method.
CAUTION
2.1
Unit: mm
2
.
IM 760401-01E
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