High cost and power consumption are the disadvantages of traditional two-wired meters, the paper introduces a design method for high precise and low cost multifunction meter. The system used ultralow power MSP430F4152 microprocessor as the main control chip which has lObits A/D module. In order to improve the measure resolution, a conversion circuit was designed to extend I Obits A/D module to 12bits A/D. To meet the needs of multipurpose, the meter allowed user to set various parameters flexibly such as unit and zero and full scale. The different physical quantities as output signals can be displayed on LCD with backlight. The internal Flash memory was used to store parameters instead of external EEPROM. The practical result shows that the meter has its own characteristic in the low cost and low power consumption, high accuracy and flexible configuration and it is fit to be used in the industrial field.
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机译：高成本和功耗是传统的两线电表的缺点，本文介绍了一种高精度，低成本的多功能电表的设计方法。该系统使用超低功耗MSP430F4152微处理器作为具有10bits A / D模块的主控制芯片。为了提高测量分辨率，设计了一个转换电路，将I Obits A / D模块扩展到12位A / D。为了满足多功能需求，仪表允许用户灵活设置各种参数，例如单位，零位和满量程。可以在带背光的LCD上显示不同的物理量作为输出信号。内部闪存用于存储参数，而不是外部EEPROM。实际结果表明，该仪表具有成本低，功耗低，精度高，配置灵活等特点，适合在工业领域中使用。
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