SLAA517F May   2012  – August 2021 MSP430F6720A , MSP430F6720A , MSP430F6721A , MSP430F6721A , MSP430F6723A , MSP430F6723A , MSP430F6724A , MSP430F6724A , MSP430F6725A , MSP430F6725A , MSP430F6726A , MSP430F6726A , MSP430F6730A , MSP430F6730A , MSP430F6731A , MSP430F6731A , MSP430F6733A , MSP430F6733A , MSP430F6734A , MSP430F6734A , MSP430F6735A , MSP430F6735A , MSP430F6736 , MSP430F6736 , MSP430F6736A , MSP430F6736A

 

  1.   Trademarks
  2. 1Introduction
  3. 2System Diagrams
  4. 3Hardware Implementation
    1. 3.1 Power Supply
      1. 3.1.1 Resistor Capacitor (RC) Power Supply
    2. 3.2 Analog Inputs
      1. 3.2.1 Voltage Inputs
      2. 3.2.2 Current Inputs
  5. 4Software Implementation
    1. 4.1 Peripherals Setup
      1. 4.1.1 SD24 Setup
    2. 4.2 Foreground Process
      1. 4.2.1 Formulas
        1. 4.2.1.1 Voltage and Current
        2. 4.2.1.2 Power and Energy
    3. 4.3 Background Process
      1. 4.3.1 Voltage and Current Signals
      2. 4.3.2 Phase Compensation
      3. 4.3.3 Frequency Measurement and Cycle Tracking
      4. 4.3.4 LED Pulse Generation
  6. 5Energy Meter Demo
    1. 5.1 EVM Overview
      1. 5.1.1 Connections to the Test Setup for AC Voltages
      2. 5.1.2 Power Supply Options and Jumper Settings
    2. 5.2 Loading the Example Code
      1. 5.2.1 Opening the Project
  7. 6Results and Calibration
    1. 6.1 Viewing Results
    2. 6.2 Calibrating the Meter
      1. 6.2.1 Gain Correction
      2. 6.2.2 Phase Correction
      3. 6.2.3 Metrology Results
  8. 7References
  9. 8Schematics
  10. 9Revision History

6.1 Viewing Results

Once the meter is turned ON, the results can be easily viewed using this GUI by connecting the RS-232 header to the PC. Run calibrator.exe in the GUI folder.

GUID-5684DF82-1EB3-4DDA-98FC-510F567561A4-low.gifFigure 6-1 E-Meter Mass Calibration

Under correct connections, you should see the GREEN filled button under "Comms". If there are problems with connections or if the code is not configured correctly, the button will be RED in color. Click on the green button to see the meter results immediately on the GUI.

GUID-7E5F0034-1E1D-45D5-95E6-501F19D52674-low.gifFigure 6-2 Meter Status

The configuration of the meter can also be viewed by clicking on "Meter features" (Example only) to get the screen shown in Figure 6-3.

GUID-2CB393D3-A8E5-48F6-BF01-A81146199286-low.gifFigure 6-3 Meter 1 Features

Results can also be viewed as pulses fed back to any energy meter test setup. Energy pulses for total active and total reactive energies are available at JP9 and JP12 (ACT) and JP14 and JP13 (REACT). In addition, the pulses go through on-board opto-couplers that might be necessary for interface to any test equipment. Look at Table 5-1 and choose the right header for energy pulses.