3-14
IM CW240E
3.3
Connecting Voltage Probes
WARNING
• For safety, connect voltage probes to the CW240 main unit and then to the
circuit under test.
• Before attaching a voltage probe to the circuit under test, turn off power to the
circuit under test. It is very dangerous to connect or disconnect a voltage
probe without turning off the circuit under test.
• Be sure to connect voltage probes to the secondary side of the circuit under
test such as current limiters (circuit breakers). Should an accident such as a
short occur, other circuits will be protected by these circuit breakers.
• Be extremely careful not to connect a voltage circuit to the current input ter-
minals or a clamp-on probe to the voltage input terminals. An improper con-
nection may result in not only damage to the circuit or equipment under test
or the CW240, but also an injury to personnel.
• Voltage input terminals N, U1, U2, and U3 are not isolated from each other. Do
not connect any voltage probes not required (not used) for measurements.
Also, do not touch voltage input terminals not used.
• For measurements, do not use any voltage probes other than those supplied
with the product.
v
1
N
v
2
v
3
L L
1
CH
H
L
H
L
H
V INPUT
V INPUT
600V
600V
〜
MAX
MAX
TERMINALS 600V
TERMINALS 600V
〜
MAX
MAX
TO EARO EAR
TH TH
L
2
H
L
CH
CH
1
H
L
CH
CH
CA
CA
T.
LOGIC NIPUT
LOGIC NIPUT
ST STARAR
T/ST
T/ST
OP OP
5.5V M
AX
5.5V MAX
L
H
L
H
LOGIC NIPUT
LOGIC NIPUT
ST STAR
T/ST
OP OP
5.5V M
AX
5.5V MAX
Voltage probes,
red, yellow, or blue
Voltage probe,
black (N terminal)
Insert the plug so that it is fastened
with a voltage input terminal securely.