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| 型号： | 71M6511-DB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 45/115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： | 否 |
| 已用 IC / 零件： | 71M6511 |
| 已供物品： | 2 个板，线缆，CD，电源 |
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71M6511/71M6511H Demo Board User’s Manual
2
2
2.1
APPLICATION INFORMATION
CALIBRATION THEORY
A typical meter has phase and gain errors as shown by φ S , A XI , and A XV in Figure 2-1. Following the typical
meter convention of current phase being in the lag direction, the small amount of phase lead in a typical
current sensor is represented as - φ S . The errors shown in Figure 2-1 represent the sum of all gain and phase
errors. They include errors in voltage attenuators, current sensors, and in ADC gains. In other words, no
errors are made in the ‘input’ or ‘meter’ boxes.
INPUT
ERRORS
METER
I φ L
φ L is phase lag
?φ S
φ S is phase lead
A XI
I RMS
IDEAL = I ,
ACTUAL = I A XI
Π
W
IDEAL = IV cos( φ L )
ACTUAL = IV A XI A XV cos( φ L ? φ S )
V
A XV
V RMS
IDEAL = V ,
ACTUAL = V A XV
ERROR ≡
ACTUAL ? IDEAL = ACTUAL ?
IDEAL IDEAL
1
Figure 2-1: Watt Meter with Gain and Phase Errors.
During the calibration phase, we measure errors and then introduce correction factors to nullify their effect.
With three unknowns to determine, we must make at least three measurements. If we make more
measurements, we can average the results.
2.1.1 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. A voltage display can be obtained for test purposes via the
command >MR2.1 in the serial interface.
Let’s say the voltage measurement has the error E V and the two Wh measurements have errors E 0 and E 60 ,
where E 0 is measured with φ L = 0 and E 60 is measured with φ L = 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 f 0 . T is equal to 1/f S , where f S is the sample frequency (2560.62Hz). Set
all calibration factors to nominal: CAL_IA = 16384, CAL_VA = 16384, PHADJA = 0.
Revision 5.4
? 2005-2007 TERIDIAN Semiconductor Corporation
Page: 45 of 115
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6511H | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Single-Phase Energy Meter IC |
| 71M6511H-DB | 功能描述:开发板和工具包 - 8051 71M6511H Demo Brd RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 71M6511H-IGT | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Single-Phase Energy Meter IC |
| 71M6511H-IGT/F | 功能描述:计量片上系统 - SoC Highly Integrated SoC w/MCU Core RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6511H-IGTR | 制造商:Maxim Integrated Products 功能描述:RESID. HI PRECISION METR (1P, .1%) - Tape and Reel |
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