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| 型号： | 71M6543F-DB-CT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 40/91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
2.2.4 CALIBRATION PROCEDURE WITH FIVE MEASUREMENTS
Each phase is calibrated individually. The calibration procedure is as follows:
1)
2)
3)
4)
5)
6)
7)
8)
The calibration factors for all phases are reset to their default values, i.e. CAL_In = CAL_Vn = 16384,
and LCOMP2_n = 0.
An RMS voltage V ideal consistent with the meter’s nominal voltage is applied, and the RMS reading
V actual of the meter is recorded. The voltage reading error Axv is determined as
Axv = (V actual - V ideal ) / V ideal
Apply the nominal load current at phase angles 0°, 60°, 180° and –60° (-300°). Measure the Wh ener-
gy each time and record the errors E 0 , E 60 , E 180 , and E 300 .
Calculate the new calibration factors CAL_In , CAL_Vn, and LCOMP2_n , using the formulae present-
ed in section 2.1.2 or using the spreadsheet presented in section 2.2.5.
Apply the new calibration factors CAL_In , CAL_Vn , and LCOMP2_n to the meter. The memory loca-
tions for these factors are given in section 1.9.1.
Test the meter at nominal current and, if desired, at lower and higher currents and various phase an-
gles to confirm the desired accuracy.
Store the new calibration factors CAL_In , CAL_Vn , and LCOMP2_n in the EEPROM or FLASH
memory of the meter. If a Demo Board is calibrated, the methods involving the command line interface
shown in sections 1.9.3 and 1.9.4 can be used.
Repeat the steps 1 through 7 for each phase.
Tip: Step 2 and the energy measurement at 0° of step 3 can be combined into one step.
2.2.5 CALIBRATION SPREADSHEETS
Calibration spreadsheets are available on the Maxim web site (www.maxim-ic.com). Figure 2-3 shows the
spreadsheet for three measurements. Figure 2-4 shows the spreadsheet for five measurements with three
phases.
Use the standard calibration spreadsheets (for 71M651x, 71M652x, or 71M653x) when calibrating meters with
CTs. These spreadsheets will provide results for the PHADJ_n parameters instead of the LCOMP2_n parame-
ters.
For the calibration, data should be entered into the calibration spreadsheets as follows:
1.
2.
3.
4.
5.
6.
7.
Page: 40 of 91
Calibration is performed one phase at a time.
Results from measurements are generally entered in the yellow fields. Intermediate results and calibra-
tion factors will show in the green fields.
The line frequency used (50 or 60Hz) is entered in the yellow field labeled AC frequency.
After the voltage measurement, measured (observed) and expected (actually applied) voltages are en-
tered in the yellow fields labeled “Expected Voltage” and “Measured Voltage”. The error for the voltage
measurement will then show in the green field above the two voltage entries.
The relative error from the energy measurements at 0° and 60° are entered in the yellow fields labeled
“Energy reading at 0°” and “Energy reading at 60°”. The corresponding error, expressed as a fraction
will then show in the two green fields to the right of the energy reading fields.
The spreadsheet will calculate the calibration factors CAL_IA , CAL_VA , and LCOMP2_A from the in-
formation entered so far and display them in the green fields in the column underneath the label “new”.
If the calibration was performed on a meter with non-default calibration factors, these factors can be
entered in the yellow fields in the column underneath the label “old”. For a meter with default calibra-
tion factors, the entries in the column underneath “old” should be at the default value (16384).
v5
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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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