71M6541F Maxim, 71M6541F Datasheet - Page 135

• Manufacturer Part Number: 71M6541F
• Description: The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are Teridian™ 4th-generation single-phase metering SoCs with a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver
• Manufacturer: Maxim

5.3.11 CE Calibration Parameters
Table 92
Rev 2
Address
0x14
0x10
0x11
0x13
0x12
0x15
0x12
0x15
CE
†
lists the parameters that are typically entered to effect calibration of meter accuracy.
DLYADJ_A
DLYADJ_B
PHADJ_A
PHADJ_B
CAL_VA
CAL_VB
CAL_IA
CAL_IB
Name
Default
16384
16384
16384
16384
0
0
0
0
Table 92: CE Calibration Parameters
Description
These constants control the gain of their respective channels. The
nominal value for each parameter is 2
channel is directly proportional to its CAL parameter. Thus, if the
gain of a channel is 1% slow, CAL should be increased by 1%.
Refer to the 71M6541 Demo Board User’s Manual for the equations
to calculate these calibration parameters.
†
These constants control the CT phase compensation. Compensation
does not occur when PHADJ_X = 0. As PHADJ_X is increased,
more compensation (lag) is introduced. The range is ± 215 – 1. If
it is desired to delay the current by the angle Φ, the equations are:
The shunt delay compensation is obtained using the equation
provided below:
where:
Where, f is the mains frequency and f
The table below provides the value of A for each current channel:
DLYADJ
71M6542 only.
PHADJ
PHADJ
_
DLYADJ_A
DLYADJ_B
Channel
X
_
_
=
X
X
∆
=
=
deg
2
2
rees
20
20
(
. 0
1
�� = 2��
. 0
+
1241
1487
0
71M6541D/F/G and 71M6542F/G Data Sheet
1 .
. 0
. 0
∆
02229
−
0155
deg
2
−
. 0
15811 / 2
b
+ 4�������� �
-1384 / 2
rees
Eq. 0 or 2
009695
. 0
a
= A
0131
⋅
)
TAN
2
=
⋅
14
TAN
2
360
2
2
⋅
Φ
A
⋅
π
+
TAN
TAN
s
Φ
14
14
14
1
2����
Value of A
a
is the sampling frequency.
(decimal)
��
2
= 16384. The gain of each
��
Φ
cos
Φ
� + 2
at 50Hz
2
at 60Hz

 

2
π
f
s
f
c
-1384 / 2
6811 / 2
sin

 

+
Eq. 1

 

2
2
ab
π
f
s
f
cos

 

14
14

 

2
π
f
s
f

 

+
135
b