33
Magtrol Model 6530 Three-Phase Power Analyzer
Chapter 4 – Operating Principles
THEOR
Y
4.1.2
A
MPS
The amps signal is brought in through a precision shunt of 0.012 ohms. This signal is amplified by
2 and passed into a programmable gain section. The gains for the voltage ranges are given below.
e
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a
R
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R
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(
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p
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1
0
2
6
/
k
2
1
5
3
.
9
1
-
p
m
a
5
0
2
6
/
k
4
.
2
1
7
8
.
3
-
p
m
a
0
1
0
2
6
/
k
2
.
1
6
3
9
.
1
-
p
m
a
0
2
0
2
6
/
0
2
6
0
0
0
.
1
-
The signal is then presented to an AD7722AS 16-bit analog to digital converter. The part accepts an
input signal of ± 1.25 volts centered on a 2.5 VDC volt bias. The chart below shows system input
at 10% and 100% of range.
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R
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p
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3
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5
2
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1
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0
0
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4
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0
3
8
5
2
1
7
9
6
4
1
8
3
0
0
0
0
.
0
=
6
3
5
5
6
/
5
.
2
=
6
1
^
2
/
5
.
2
:
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=
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