在发光电路的设计中采用了TL431A可调节精密基准电源并联稳压器；
TL431A programmable shunt regulator was used in the electrical and optical circuit;
其输出的基准信号稳定，与电源电压、温度以及工艺的变化无关。
Reference source outputs a stable reference signal which is independent of power supply voltage, temperature and process.
断路器被提供用于保护115 VAC输入(各有2个)，以及保护被测指示器(UUT)所用于电源，基准或照明的可变振幅低压电源。
Circuit Breakers are supplied to protect the 115 VAC Inputs (2 each) as well as the Variable Amplitude Low Voltage Powers used by the Indicator Under Test (UUT) for Power, Reference or Lighting.
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