71m6515h Maxim Integrated Products, Inc., 71m6515h Datasheet - Page 25

• Manufacturer Part Number: 71m6515h
• Description: 71m6515h Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

We calculate PHADJ from φ
Finally, we calculate the new calibration current gain coefficient, including compensation for a slight gain increase in the phase
calibration circuit.
Calibration with Five Measurements
The five measurement method provides more orthogonality between the gain and phase error derivations. This method
involves measuring E
16384, PHADJ_A = 0..
First, calculate A
1.
Calculate A
2.
3.
4.
5.
6.
Use above results along with E
7.
8.
Page: 25 of 57
CAL
PHADJ
_
E
E
E
E
=
E
=
A
A
A
I
180
XI
300
0
0
XV
60
NEW
XV
A
A
=
=
+
XI
=
XV
XV
=
A
=
=
=
2
from E
E
IV
XI
(
=
IV
A
A
20
E
IV
180
IV
E
XI
XI
CAL
XV
=
0
A
⎡
⎢
⎣
V
A
A
1 (
XV
+
A
A
XV
=
cos(
cos(
from E
E
A
+
XV
0
XV
E
XV
−
XI
0
IV
cos(
1
2
2
and E
V
IV
_
180
A
, E
IV
IV
+
2
cos(
A
A
tan(
A
φ
A
φ
I
XI
cos(
−
)
XI
XV
E
cos(
φ
S
S
9
0
XI
V
XI
cos(
cos(
, E
cos(
:
180
)
)
)
2
S
180
cos(
S
φ
φ
A
1
cos(
cos(
sin(
)
, the desired phase lag:
+
−
+
S
180
) 0
S
+
:
XI
+
60
180
1
60
1 )
)
−
A
A
0
[
, E
2
60
cos(
2
60
2
180
and E
)
XV
−
XV
−
−
+
π
60
20
60
)
φ
)
−
f
A
A
1 (
, and E
0
PHADJ
S
φ
φ
T
−
XI
XI
−
)
−
300
S
S
)
φ
© 2005-2008 TERIDIAN Semiconductor Corporation
φ
−
)
tan(
tan(
)
2
−
S
1
S
1
to calculate φ
−
−
−
)
)
−
tan(
9
=
300
1
2
−
−
)
60
60
2
2
2 (
1
A
1
. Again, set all calibration factors to nominal, i.e. CAL_IA = 16384, CAL_VA =
1 (
−
φ
XV
=
)
)
+
−
sin(
sin(
S
2
A
1 )
2
2
A
1 (
[
XV
−
−
XI
20
φ
φ
9
−
−
)
S
S
S
cos(
PHADJ
A
.
2
1 (
cos(
)
)
XI
−
1
−
−
9
−
)
cos(
φ
1
1
2
2
cos(
S
π
−
)
9
f
φ
)
−
0
−
T
cos(
2
S
1
π
2
)
)
1 (
f
+
−
0
1
T
2
1 (
−
π
)
2
−
f
]
0
−
2
T
9
)
−
)
9
cos(
]
)
⎤
⎥
⎦
2
2
π
f
Energy Meter IC
0
T
))
DATA SHEET
71M6515H
MARCH 2008
V1.4