6240B DC Voltage Current Source/Monitor Operation Manual
5.1.2 Remote Sensing (2-Wire/4-Wire Connection)
5-2
5.1.2
Remote Sensing (2-Wire/4-Wire Connection)
When connecting the 6240B and the DUT, use 2-wire or 4-wire connection while considering the follow-
ing conditions:
•
Apply 2-wire connection if the output current is relatively low and the cable line resistance does not
matter.
•
Apply 4-wire connection if the output current is relatively high and the cable line resistance matters.
•
When using within the specified accuracy:
(Line resistance
output current)
10
V
2-wire connection
(Line resistance
output current) > 10
V
4-wire connection
The line resistance of the supplied cable A01044 is approximately 100 m
.
Thus, when the output current is 100
A or higher, use the 4-wire connection.
•
When allowing the error voltage (ev):
(Line resistance
output current)
ev
2-wire connection
(Line resistance
output current) > ev
4-wire connection
When the supplied cable A01044 is used and the error voltage of 10 mV is allowed, the 2-wire con-
nection is used up to 100 mA.
Pressing the
4W/2W
key switches between the 2-wire and 4-wire connections.
2-wire connection: The 2W indicator goes ON.
4-wire connection: The 4W indicator goes ON.
Figure 5-2 2-Wire and 4-Wire Connections
DRIVING GUARD
HI
SENSE
OUTPUT
LO
Eo
ｒ
１
ｒ
４
DUT
Vo=Eo-(r
3
+r
4
) Is
ｒ
３
ｒ
２
Is
Io
Vo
≒
Eo
Vo
DRIVING GUARD
HI
SENSE
OUTPUT
LO
Io
ｒ
２
Eo
DUT
ｒ
１
Vo
Vo=Eo-(r
1
+r
2
) Io
An error may occur due to r1 and r2 voltage drop.
(a) 2-wire connection
(b) 4-wire connection
