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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 38/91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
Now that we know the A XV , A XI , and φ S errors, we calculate the new calibration voltage gain coefficient from the
previous ones:
CAL _ V NEW =
CAL _ V
A XV
20 ? tan( φ S ) 1 + ( 1 ? 2 ? 9 ) 2 ? 2 ( 1 ? 2 ? 9 ) cos( 2 π f 0 T ) ] ?
[
]
? ( 1 ? 2 ) sin( 2 π f 0 T ) ? tan( φ S ) 1 ? ( 1 ? 2 ) cos( 2 π f 0 T ) ?
We calculate PHADJ from φ S , the desired phase lag:
PHADJ = 2 ? ? 9 ? 9 ?
And we calculate the new calibration current gain coefficient, including compensation for a slight gain increase
in the phase calibration circuit.
PHADJ ? 2 ( 1 ? 2 ? 9 ) cos( 2 π f 0 T ))
PHADJ ( 2 + 2
CAL _ I NEW =
CAL _ I
A XI
1 +
2
? 20
1
? 20
1 ? 2 ( 1 ? 2 ? 9 ) cos( 2 π f 0 T ) + ( 1 ? 2 ? 9 ) 2
2.2 CALIBRATION PROCEDURES
2.2.1 CALIBRATION EQUIPMENT
Calibration requires that a calibration system is used, i.e. equipment that applies accurate voltage, load current
and load angle to the unit being calibrated, while measuring the response from the unit being calibrated in a re-
peatable way. By repeatable we mean that the calibration system is synchronized to the meter being calibrated.
Best results are achieved when the first pulse from the meter opens the measurement window of the calibration
system. This mode of operation is opposed to a calibrator that opens the measurement window at random time
and that therefore may or may not catch certain pulses emitted by the meter.
It is essential for a valid meter calibration to have the voltage stabilized a few seconds be-
fore the current is applied. This enables the Demo Code to initialize the 71M6543F and to
stabilize the PLLs and filters in the CE. This method of operation is consistent with meter
applications in the field as well as with metering standards.
During calibration of any phase, a stable mains voltage has to be present on phase A. This
enables the CE processing mechanism of the 71M6543F necessary to obtain a stable cali-
bration.
2.2.2 DETAILED CALIBRATION PROCEDURES
The procedures below show how to calibrate a meter phase with either three or five measurements. The
PHADJ equations apply only when a current transformer is used for the phase in question. Note that positive
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| 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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