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Connection to Circuits
3-Phase Measurement (W3) 5
5-17
Measurement with Star Point Adapter
In systems with three voltage wires, the three wires should be connected to the HI
terminal and the LO terminals should be connected together.
However, in high frequency switching electronics systems such as drives, inverters, and
UPS, this method has additional errors due to high frequency components being shunted
to the ground connection. To compensate for this error, use the star point adapter, see
Figure 5-11.
HI
VOLTAGE
1000 V max
LO
PROBE
EXT.SHUNT
10 V max
123
HI
CURRENT
10 A max
LO
ALL INPUTS MAX 1000V CATII TO
PROBE
EXT.SHUNT
10 V max
HI
CURRENT
10 A max
LO
HI
VOLTAGE
1000 V max
LO
Max. 10 m
Load
Star Point Adapter
*2
P
2
I
1
I
1
I
2
I
2
P
1
S
2
S
1
I
3
I
3
P
2
P
1
S
2
S
1
V
12
V
1
V
32
V
2
V
3
C
B
c
b
A
a
L1
L2
L3
esn078.eps
Figure 5-11. 3-Phase Measurement with Star Point Adapter
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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