一段翻译

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多用表利用单片机的控制、运算功能，根据离散积分公式及离散傅立叶变换，基于对电力系统参数进行交流采样的思想，实现了同时对一路工频交流电的频率、电压有效值、电流有效值的测量。用软件计算分析出有功功率、无功功率、功率因数、电压基波有效值、电压总谐波有效值等参数，利用数字电位器，使系统具有自校准、自动量程转换功能。系统充分发掘了单片机的运算能力，以软件代替硬件电路，使硬件电路大大简化。
数字式工频交流电参数多用表可实现同时对一路工频交流电的各种功率值、电压有效值、电流有效值等参数的测量。它利用单片机的控制、运算功能，以软件设计代替硬件电路，采用交流电采样方式，用软件计算分析出各种有效值、有功功率、无功功率、功率因数等参数，使硬件电路大大简化。
本系统利用了数字电位器调节准确方便，使用寿命长，受外部环境影响小，性能稳定等特点，设计的电路具有自校准、量程可自动转换、测量精度高、性能稳定等特点

Multimeter use of single-chip control, computing functions, according to the formula of discrete points and discrete Fourier transform, the power system parameters based on a sampling of ideas to exchange, at the same time all the way to achieve the frequency of the alternating current frequency, voltage rms, current RMS measurements. Calculation and analysis software of active power, reactive power, power factor, fundamental RMS voltage, RMS voltage total harmonic parameters such as the use of digital potentiometers, the system self-calibration, automatic conversion range. System to fully exploit the computing power of single-chip software instead of hardware circuits, so that greatly simplify the hardware circuit.
Digital Multimeter-frequency alternating current parameters can be achieved along the way at the same time-frequency alternating current value of the various power, voltage rms, current rms measurement parameters. It uses single-chip control, computing features to the software instead of hardware circuit design, the use of alternating current sampling methods, using a variety of calculation and analysis software, RMS, active power, reactive power, power factor and other parameters, so that greatly simplify the hardware circuit .
The system uses a digital potentiometer to facilitate accurate adjustment, long service life, the impact of the external environment by a small, stable performance characteristics of the circuit design with self-calibration, range can be automatically converted, high measurement accuracy, stable performance and so on.

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