参数资料
型号: 71M6541F-DB
厂商: Maxim Integrated Products
文件页数: 136/166页
文件大小: 0K
描述: DEMO BOARD 71M6541F
标准包装: 1
系列: *
71M6541D/F/G and 71M6542F/G Data Sheet
5.3.11 CE Calibration Parameters
Table 92 lists the parameters that are typically entered to effect calibration of meter accuracy.
Table 92: CE Calibration Parameters
CE
Address
0x10
0x11
0x13
0x14 ?
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
Default
16384
16384
16384
16384
Description
These constants control the gain of their respective channels. The
nominal value for each parameter is 2 14 = 16384. The gain of each
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.
?
71M6542 only.
These constants control the CT phase compensation. Compensation
0x12
PHADJ_A
0
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:
0x15
PHADJ_B
0
PHADJ _ X = 2 20
0 . 02229 ? TAN Φ
0 . 1487 ? 0 . 0131 ? TAN Φ
at 60Hz
PHADJ _ X = 2 20
0 . 0155 ? TAN Φ
0 . 1241 ? 0 . 009695 ? TAN Φ
at 50Hz
The shunt delay compensation is obtained using the equation
provided below:
a 2 cos 2 ? ?
? + 2 ab cos ? ?
c sin ? ?
? ?
? ? + b
0x12
DLYADJ_A
0
DLYADJ _ X = ? deg rees ( 1 + 0 . 1 ? deg rees ) 2 14
2 π
360
? 2 π f ? ? 2 π f
?
? f s ? ? f s
? 2 π f ?
? f s ?
?
?
a = 2 A ?
2 ????
?? = 2 ?? 2 + 4 ???????? ?
? +2
0x15
DLYADJ_B
0
where:
b = A 2 + 1 ?
??
Where, f is the mains frequency and f s is ?? the sampling frequency.
The table below provides the value of A for each current channel:
Value of A
Channel
Eq. 0 or 2
(decimal)
Eq. 1
DLYADJ_A
15811 / 2
14
6811 / 2 14
136
DLYADJ_B
-1384 / 2
14
-1384 / 2 14
Rev 4
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