参数资料
型号: 71M6515H-IGTWR/F
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PQFP64
封装: LEAD FREE, LQFP-64
文件页数: 19/60页
文件大小: 826K
代理商: 71M6515H-IGTWR/F
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
Page: 26 of 60
2005
2011 Teridian Semiconductor Corporation
1.6
A Maxim Integrated Products Brand
Calibration with Three Measurements
The simplest calibration method is to make three measurements. Typically, a voltage measurement and two Watt-hour (Wh)
measurements are made.
If the voltage measurement has the error EV and the two Wh measurements have errors E0 and E60, where E0 is measured
with
φ
L = 0 and E60 is measured with φL = 60. These values should be simple ratios—not percentage values. They should be
zero when the meter is accurate and negative when the meter runs slow. The fundamental frequency is f0. T is equal to 1/fS,
where fS is the sample frequency (2520.62Hz). Set all calibration factors to nominal: CAL_IA = 16384, CAL_VA = 16384,
PHADJ_A = 0.
From the voltage measurement, we determine that
1.
1
+
=
V
XV
E
A
We use the other two measurements to determine
φ
S and AXI.
2.
1
)
cos(
1
)
0
cos(
)
0
cos(
0
=
=
S
XI
XV
S
XI
XV
A
IV
A
IV
E
φ
2a.
)
cos(
1
0
S
XI
XV
E
A
φ
+
=
3.
1
)
60
cos(
)
60
cos(
1
)
60
cos(
)
60
cos(
60
=
=
S
XI
XV
S
XI
XV
A
IV
A
IV
E
φ
3a.
[
]
1
)
60
cos(
)
sin(
)
60
sin(
)
cos(
)
60
cos(
60
+
=
S
XI
XV A
A
E
φ
1
)
sin(
)
60
tan(
)
cos(
+
=
S
XI
XV
S
XI
XV
A
φ
Combining 2a and 3a:
4.
)
tan(
)
60
tan(
)
1
(
0
60
S
E
φ
+
=
5.
)
60
tan(
)
1
(
)
tan(
0
60
+
=
E
S
φ
6.
+
=
)
60
tan(
)
1
(
tan
0
60
1
E
S
φ
and from 2a:
7.
)
cos(
1
0
S
XV
XI
A
E
A
φ
+
=
Now that we know the AXV, AXI, and φS errors, we calculate the new calibration voltage gain coefficient from the previous ones:
XV
NEW
A
V
CAL
V
CAL
_
=
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