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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 35/91页 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD 71M6543F-DB-CT |
| 标准包装： | 1 |
| 系列： | * |
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71M6543 Demo Board User’s Manual
2
2
APPLICATION INFORMATION
2.1 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 me-
ter 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 cali-
bration factors to nominal: CAL_IA = 16384, CAL_VA = 16384, LCOMP2_A = 16384.
Note: The derivation of the calibration formulae is provided for CTs, where a phase adjustment is performed to
compensate for the phase error of the CT. For operation with 71M6xxx Remote Sensor Interfaces, a delay
compensation LCOMP2_n is used. Spreadsheets are available to calculate the calibration coefficients for all
hardware configurations.
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| 71M6543F-IGT/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC 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 |
| 71M6543F-IGTR/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC 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 |
| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6543G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation |
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