Wiring The Circuit Under Measurement For Direct Input - YOKOGAWA WT1800 User Manual

2.9 Wiring the Circuit under Measurement for
Direct Input
This section explains how to wire the measurement cable directly from the circuit under measurement
to the voltage or current input terminal.
To prevent electric shock and damage to the instrument, follow the warnings given in section 2.5,
"Precautions When Wiring the Circuit under Measurement."
Connecting to the Input Terminal
Voltage Input Terminal
The terminals are safety banana jacks (female) that are 4 mm in diameter.
Only insert a safety terminal whose conductive parts are not exposed into a voltage input terminal.
If you are using the included 758931 Safety Terminal Adapter, see section 2.6.
Current Input Terminal
• When the voltage of the circuit under measurement is being applied to the current input terminals,
do not touch the external current sensor input terminals. Doing so is dangerous because the
terminals are electrically connected inside the instrument.
• When connecting a measurement cable from an external current sensor to an external current
sensor input connector, remove the cables connected to the current input terminals. Also, when
the voltage of the circuit under measurement is being applied to the external current sensor input
terminals, do not touch the current input terminals. Doing so is dangerous because the terminals
are electrically connected inside the instrument.
• The terminal is a binding post, and the screws are M6. Either wind the wire around the screw or
pass the crimping terminal through the screw axis, and then tighten firmly with the terminal knob.
Confirm that no foreign materials are caught between the current input terminal and the
crimping terminal.
Periodically confirm that the current input terminal is not loose and that there are no foreign
materials caught between the current input terminal and the crimping terminal.
3.1
In the figures on the following pages, the WT1800's input elements, voltage input terminals, and
current input terminals are simplified as shown in the following figure.
Voltage input
terminal
Current input
terminal
IM WT1801-03EN
2.1
Unit: mm
VOLTAGE
EXT
±
U
CURRENT
±
I
±
±
Input element
CAUTION
U
The voltage input terminal and
U1
current input terminal of input
±
element 1 are labeled as U1 and
I1, respectively.
I
I1
±
1
2
3
4
5
6
App
Index
2-15