想请有理工科背景的英文强人帮忙翻译一段英文信件！

The support module's APD bias has come factory set for an APD
multiplication gain between 10 and 20. ADP 偏压控制的支撑模块有一些出厂设置即振幅在10－20之间。（这里come应该是some?） The APD bias monitor via the BNC
connector is provided as a way to check the bias and adjust it as
desired. ADP偏压监视器则可以通过BNC连接端提供电压的偏压值的校核和调整到期望值。 You do not need to have the APD bias monitored while the
module is in operation， but it is good idea to double check its value at
least intermittently. 当这个支撑模块在运行过程中 你不需要监测ADP 偏压电路，当然监测也可以起到双重校核的作用。A simple voltmeter can be used to check the bias，
and any BNC type connection and cabling should work fine. 一个简单的伏特表就可以监测偏压值，其他BNC连接器和电线也可以起到监测偏压值的作用。 The
specifications sheet has a chart showing the APD's DC current and gain
versus it bias， as well as a table listing the bias at M=10 and M=20. 说明书里有两个表格：一个表格详细说明了APD上与当前电压偏压值相对应的电流和增幅， 另一个则是振幅在10和20之间的详细对应值表格。
While a current-limiter in the support module protects from damaging the
APD， you must keep the APD bias below breakdown to prevent a noisy output.当启动回路保护装置启动的时候 你需要调整ADP 偏压值到可用范围以内，当超出范围 将会有警报提示。
The SMA outputs are designed for 50-Ohm coax cabling.电阻设置是50欧 Since
your receiver has 300 MHz output filters most cabling should work fine. 接收端频率设置300M赫兹是工作状态较稳定数值。
Higher frequency RF or microwave rated cabling is not required. 更高频的微波是不需要的。 Closely
matching cable length for the two outputs is required when you are
terminating the two outputs differentially， otherwise when using single
ended outputs ensure that both outputs are terminated similarly.（这段是说在分别使用双端口和单端口的时候，当要关闭端口 应该注意一些事项 但我不是很理解 所以就不乱说了）
In terms of the support module's ground， it should be provided
through the power supply's IEC connector to a safety earth. 就支撑模块的工作环境应该是由带有接地端的IEC标准插座提供电源。 For signal
integrity the receiver's outputs should be grounded through the SMA coax
cabling to whatever instrument you are using read the output， i.e.
oscilloscope or counter. 为了接收到的信号的完整性 应该使用SMA 标准电缆（coax
cabling）将输出端和显示端连接起来，例如示波器或者显示器。 The ground plug is an optional ground
connected directly to the outputs' SMA coax ground， but it is not
required for operation.接地端是自由选择的 并没有硬性要求。
I am also attaching an electronic copy of the specifications and
operations sheets if more copies of it are needed. 如果需要 我还可以提供电子版的标准手册和操作手册。