另外，传感器电路中包含了一个校准电路来提供产生校准参数的校准电流。
In addition, a calibration circuit is incorporated in the sensor circuit for providing calibration current, which is used to generate calibration parameter.
为校准电路，首先断开或使输入光敏二极管变暗，以便A 1 A转换非交流信号。
To calibrate the circuit, first disconnect or obscure the input photodiode so that A1A converts no ac signal.
该制造商认为：假如在放大器电路板内安装一个自动校准电路，增加的成本远远超出可接受的范围。
The cost of including an auto-calibration circuit within the amplifier was deemed to be impractical as it would raise the cost of good beyond the acceptable level.
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