Measurement With Star Point Adapter - Fluke NORMA 4000 Operator's Manual

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.
L1
L2
L3
I
3
P
1
S
1
I
3
3
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I I
2 1
P P
2 1
S
S
S
2
2
1
I
1
V
3
I
2
V
2
HI HI
VOLTAGE VOLTAGE
1000 V max 1000 V max
LO LO
2
PROBE PROBE
EXT.SHUNT EXT.SHUNT
10 V max 10 V max
HI HI
CURRENT CURRENT
10 A max 10 A max
LO LO
ALL INPUTS MAX 1000V CATII TO
Figure 5-11. 3-Phase Measurement with Star Point Adapter
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www.
V
32
P C
2
c
b
Star Point Adapter
V
1
1
Connection to Circuits
3-Phase Measurement (W3)
Load
*2
V
12
B
A
a
Max. 10 m
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1.888.610.7664
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5
5-17