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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/91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
over-voltages. This choice need not be of concern, since the ADC in the 71M6543F has enough resolution,
even when operating at 120 Vrms or 240 Vrms.
If a different set of voltage dividers or an external voltage transformer (potential transformer) is to be used,
scaling techniques should be used.
In the following example we assume that the line voltage is not applied to the resistor divider for VA formed by
R66, R64, R47, R39, and R32, but to a voltage transformer with a ratio N of 20:1, followed by a simple resistor
divider. We also assume that we want to maintain the value for VMAX at 600V to provide headroom for large
voltage excursions.
When applying VMAX at the primary side of the transformer, the secondary voltage V s is:
V s = VMAX / N
V s is scaled by the resistor divider ratio R R . When the input voltage to the voltage channel of the 71M6543 is the
desired 177mV, V s is then given by:
V s = R R * 176.8 mV
Resolving for R R , we get:
R R = ( VMAX / N) / 176.8 mV = (600V / 30) / 176.8 mV = 170.45
This divider ratio can be implemented, for example, with a combination of one 16.95 k ? and one 100 ? resistor.
If potential transformers (PTs) are used instead of resistor dividers, phase shifts will be introduced that will re-
quire negative phase angle compensation. Teridian Demo Code accepts negative calibration factors for phase.
1.9
CALIBRATION PARAMETERS
1.9.1 GENERAL CALIBRATION PROCEDURE
Any calibration method can be used with the 71M6543F ICs. This Demo Board User’s Manual presents calibra-
tion methods with three or five measurements as recommended methods, because they work with most manual
calibration systems based on counting "pulses" (emitted by LEDs on the meter).
Naturally, a meter in mass production will be equipped with special calibration code offering capabilities beyond
those of the 71M6543 Demo Code. It is basically possible to calibrate using voltage and current readings, with
or without pulses involved. For this purpose, the MPU Demo Code should be modified to display averaged volt-
age and current values (as opposed to momentary values). Also, automated calibration equipment can com-
municate with the Demo Boards via the serial interface and extract voltage and current readings. This is possi-
ble even with the unmodified Demo Code.
Complete calibration procedures are given in section 2.2 of this manual.
Regardless of the calibration procedure used, parameters (calibration factors) will result that will have to be ap-
plied to the 71M6543F IC in order to make the chip apply the modified gains and phase shifts necessary for ac-
curate operation. Table 1-4 shows the names of the calibration factors, their function, and their location in the
CE RAM.
Again, the command line interface can be used to store the calibration factors in their respective CE RAM ad-
dresses. For example, the command
>]10=+16302
stores the decimal value 16302 in the CE RAM location controlling the gain of the current channel ( CAL_IA ).
The command
>]11=4005
stores the hexadecimal value 0x4005 (decimal 16389) in the CE RAM location controlling the gain of the volt-
age channel ( CAL_VA ).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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