新型的FET输入管放大器(如ad820系列放大器)，在设计上做了改善，对于额定电源电压范围之内的信号，能够防止输出电压相位反转。
New FET-input amplifiers, like the AD820 family of amplifiers, incorporate design improvements that prevent output voltage phase reversal for signals within the rated supply voltage range.
检查电源电压是否与额定电压相符，不能在超过或低于额定电压10%的电源上使用。
Whether or not check the supply voltage and rated voltage line can not be above or below 10% of rated voltage on the use of power.
在额定控制电源电压低于35%时，欠电压脱扣器应防止断路器合闸。
At rated control supply voltage less than 35% under-voltage should prevent breaker from closing.
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