Index - YOKOGAWA WT1800 User Manual

• Minimize the area of the space between the wires connecting the current sensor to the external
current sensor cable. This reduces the effects of the lines of magnetic force (which are caused by the
measurement current) and the external noise that enter the space.
Shunt-type current sensor
• Connect the shunt-type current sensor to the power earth ground as shown in the figure below. If you
have to connect the sensor to the non-earth side, use a wire that is thicker than AWG18 (with a conductive
cross-sectional area of approximately 1 mm
effects of common mode voltage. Take safety and error reduction into consideration when constructing
external current sensor cables.
• When the circuit under measurement is not grounded and the signal is high in frequency or large in power,
the effects of the inductance of the shunt-type current sensor cable become large. In this case, use an
isolation sensor (CT, DC-CT, or clamp) to perform measurements.
Clamp-type current sensor
In the figures on the following pages, the WT1800's input elements, voltage input terminals, and
external current sensor input connectors are simplified as shown in the following figure.
Voltage input
terminal
External current
sensor input
connector(EXT)
IM WT1801-03EN
2.10 Wiring the Circuit under Measurement When Using Current Sensors
Space between the connection wires
OUT H
I External current sensor cable (B9284LK, sold separately)
±
Shielded wire
OUT L
U
±
External current sensor
input connector
Shunt-type current sensor
U
±
External current sensor
input connector
VOLTAGE
EXT
±
U
CURRENT
±
±
Input element
WT1800
2 ) between the sensor and the instrument to reduce the
WT1800
Voltage input terminal
WT1800
Voltage input terminal
EXT
LOAD
LOAD
2-19
1
2
3
4
5
6
App

Index