Microchip Technology ARD00330 数据表

© 2011 Microchip Technology Inc.

DS51964A-page 11

This chapter describes the method to calculate calibration parameters. It includes
various types of calibration suitable for different stages of meter design.

Based on the type of meter accuracy class, and the stages of meter development, the
different types of calibration options provided are: 
• Closed Loop Calibration
• Multipoint Calibration
• Single Point Calibration
During the calibration process, the following register values are computed:
• Gain registers

- GAIN_V_RMS
- GAIN_I_RMS
- GAIN_POWER_ACT
- GAIN_POWER_REACT
- GAIN_NUMR_ENERGY_ACT
- GAIN_DENR_ENERGY_ACT
- GAIN_NUMR_ENERGY_REACT
- GAIN_DENR_ENERGY_REACT

• Offset  registers

- OFFSET_I_RMS
- OFFSET_V_RMS
- OFFSET_POWER_ACT
- OFFSET_POWER_REACT

• Phase compensation register

- PHASE_COMPENSATION

• Creep threshold for No Load condition

- CREEP_THRSHOLD_MINUTE
- CREEP_THRSHOLD_SECOND

The calibration flow charts, procedures and equation presented in this section are all 
automated using Microchip’s “Single Phase Energy Meter Calibration Software”, 
downloadable from the Energy Meter product page. The calibration software features 
multiple tabs, offering three different calibration processes.

Note: For descriptions on these registers, refer to User’s Guide – “PIC18F87J72 

Energy Meter Reference Design”(DS51931)