光电二极管固有的热产生的暗电流不断为二极管充电.

The thermally generated <em>dark</em> <em>current</em> intrinsic to the photodiodes is always working to charge the diode.

另外还提供一个可选配的黑色阳极电镀铝盖用于在进行暗电流测试时遮蔽环境光线。

An optional black anodized aluminum cover can be used to eliminate ambient light and to block the light path when taking <em>dark</em> <em>current</em> measurements.