The traditional power meter calibrating system usually has the shortcomings of low efficiency and large volume due to its standard voltage and current source rely on the analog amplifier.

传统的电力校表台由模拟功放向待校电表及标准表提供校表电流，造成系统效率低、体积大、重量重。

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An OPA128 operational amplifier with extreme low bias current and big gain is adopted for enhancing the response to weak signals.

同时为了保证测量精度，采用偏置电流极低的运算放大器opa128，并且增大了反馈电阻，以增强对弱信号的响应。

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Experimental results show that this digital power amplifier has the characteristic of low current ripple, quick current response and high stability.

实验结果表明，数字功率放大器具有电流纹波小、稳定性能好和电流响应快等优点。

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