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APD 模块
APD 模块的输出电压振幅是多少？
出厂时，输出电压振幅设置如下。
| 型号 | 输出电压振幅 |
|---|---|
| C12703 | 约 +10 V |
| C12703-01 | 约 -10 V |
| C12702 系列 | 约 -0.4 至 -0.3 V |
| C10508-01 | 约 +3 V |
| C5658 | 约 +0.7 至 +0.8 V |
APD 模块的最大入射光量是多少？
每种类型的最大入射光量等于输出电压振幅 [V] ÷ 光电变换灵敏度 [V/W]。顺便说一句，只需几毫瓦的入射光量即可导致设备损坏，因此在实际向设备输入光之前要采取预防措施。
APD 模块未正常工作。为什么会这样？
请检查以下几点：
*电源配线是否正确？
*终端电阻应具有此处显示的值。
| 型号 | 终端电阻 |
|---|---|
| C12703 系列 | 10 kΩ 或以上 |
| C10508-01 | 10 kΩ 或以上 |
| C12702 系列 | 50 Ω |
| C5658 | 50 Ω |
*入射光量是否超过最大允许光量？
*增益率设置是否过高？ （C12702/C12703 系列）
如果增益率过高，则 APD 暗电流将会增大，导致 APD 的过剩噪声增大并降低信噪比。
输出上叠加了噪声信号。如何避免这种情况？
如果环境波动光进入 APD，则可能会导致输出中出现噪声。输出信号上可能会叠加来自市售电源的噪声，特别是在荧光灯照明条件下。我们建议尽可能在暗处使用 APD 模块。此外，请使用具有低波纹噪声的串联电源，而不是开关电源。如果此问题未得到解决，请联系我们的销售办公室，获取有关环境条件的建议。
光纤能否连接到 APD 模块？
要通过光纤连接到 C12702/C12703 系列和 C10508-01 模块，请使用 FC 和 SMA 型光纤适配器（单独出售）。推荐使用石英纤芯直径 50 μm 和包层直径 125 μm 的渐变型 (GI) 多模光纤。C5658 模块不能连接光纤。如需通过光纤连接到 C5658 模块，则需要定制修改。
是否有推荐的电源？
我们将告知您适用于 APD 模块的市售稳定电源。
详情请联系我们的销售办事处。
是否有推荐的光源？
使用与 APD 模块的光谱灵敏度特性相匹配的 LD 或 LED 等光源。要检查将输入 APD 的光量，我们建议使用功率监视器提前测量光功率。
AD 转换器能否直接连接到 APD 模块？
不建议将 AD 转换器直接连接到 APD 模块。AD 转换器的输入阻抗可能会对 APD 模块产生不利影响，导致无法获得令人满意的特性。
APD 模块的电气特性是否可以修改？
我们可以对模块中安装的 APD 以及带宽和灵敏度等电气特性进行定制修改（需要支付服务费）。
APD 模块的增益率是否可以更改？
对于 C12702 系列和 C12703 系列，可以使用 APD 增益率调整微调器更改 APD 增益率。但请注意，这种微调器没有任何刻度和限位挡块机构，并且可以多次转动。因此在转动微调器之前，建议让参考光进入 APD 并检查输出，以便在需要时将微调器恢复到初始状态。这种微调器的可调增益率范围为一到几百倍（发生故障时）。
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