参数资料
型号: 71M6511-DB
厂商: Maxim Integrated Products
文件页数: 52/115页
文件大小: 0K
描述: BOARD DEMO 71M6511 ENERGY METER
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
主要目的: 电源管理,电度表/功率表
嵌入式:
已用 IC / 零件: 71M6511
已供物品: 2 个板,线缆,CD,电源
71M6511/71M6511H Demo Board User’s Manual
2.2.4 COMPENSATING FOR NON-LINEARITIES
Nonlinearity is most noticeable at low currents, as shown in Figure 2-5, and can result from input noise and
truncation. Nonlinearities can be eliminated using the QUANT variable.
12
10
8
6
4
2
0
error
0.1
1
10
100
I [A]
Figure 2-5: Non-Linearity Caused by Quantification Noise
The error can be seen as the presence of a virtual constant noise current. While 10mA hardly contribute any
error at currents of 10A and above, the noise becomes dominant at small currents.
The value to be used for QUANT can be determined by the following formula:
V ? I
QUANT = ?
error
100
VMAX ? IMAX ? LSB
Where error = observed error at a given RMS voltage (V) and RMS current (I),
VMAX = voltage scaling factor, as described in section 1.8,
IMAX = current scaling factor, as described in section 1.8,
LSB = QUANT LSB value = 7.4162*10 -10 W
Example: Assuming an observed error as in Figure 2-5, we determine the error at 1A RMS to be +1%. If
VMAX is 600V and IMAX = 208A, and if the measurement was taken at 240V RMS, we determine QUANT
as follows:
1 ? 240 ? 1
QUANT = ?
100
600 ? 208 ? 7 . 4162 ? 10 ? 10
= ? 11339
QUANT is to be written to the CE location 0x2F. It does not matter which current value is chosen as long as
the corresponding error value is significant (5% error at 0.2A used in the above equation will produce the
same result for QUANT ).
Input noise and truncation can cause similar errors in the VAR calculation that can be eliminated using the
QUANT_VAR variable. QUANT_VAR is determined using the same formula as QUANT .
Page: 52 of 115
? 2005-2007 TERIDIAN Semiconductor Corporation
Revision 5.4
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