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Section 3 addresses switch card and mainframe considerations. 第3章着重介绍了开关卡和主机。
Section 3 provides a detailed description of switch card and mainframe specifications. 第3章详细介绍开关卡和主机的技术指标。
Handle the switch card by the edges to avoid contaminating it with dirt, body oil, etc. 在拿放开关卡是要握住侧边，以防灰尘、人体油脂等对其造成污染。
This may require using a high current switch card for sourcing and a low voltage switch card for measuring. 这就可能需要利用一个大电流开关卡来提供电流，一个小电压开关卡用于测量。
To ensure proper shielding, choose a switch card with shielded connectors, such as coax or triax connectors. 为确保合适的屏蔽，请选择带有屏蔽连接器的开关卡，例如同轴或同轴三柱连接器。
To verify a switch card's specifications, the contact potential can be measured with a sensitive voltmeter. 若需验证某个开关卡的技术指标，可利用灵敏的伏特计测得其接触电势。
This is not usually specified for a switch card, but the limitation is usually a function of the trace width and connector ratings. 虽然开关卡的技术指标并不明确显示，但是电流限值通常是走线宽度和连接器额定值的函数。
Using a matrix switch card allows connecting any input to any output by closing the switch at the intersection (crosspoint) of a given row and column. 利用一块矩阵开关卡，通过闭合指定行和列的交叉点，即可将任意输入连接到任意输出。
One way to avoid this problem is to use a switch card with independent (isolated) relays and connect with wires rated to carry the total current. 避免这种问题的方法之一就是采用具有独立（隔离的）继电器、连接线额定值能够满足总电流的开关卡。
To minimize errors due to such leakage paths, choose a switch card with high isolation resistance and use guarding wherever possible, including in the test fixturing and cabling. 为了最小化这样的漏泄通路引起的误差，请选择具有高隔离电阻的开关卡，并尽量采用保护线，包括测试夹具和电缆。
In some cases, mixed signal types will limit the choice of switch cards. 在有些情况下，混合的信号类型会限制开关卡的选择。
Matrix switch cards generally have two or three poles per crosspoint. 矩阵开关卡通常在每个交叉点有两个或三个电极。
To minimize extraneous current paths (or leakage current), use a switch card that has high channel isolation resistance (the isolation between channels). 为了最小化外来电流通路（或漏泄电流），需使用具有高通道隔离电阻（通道之间的隔离）的开关卡。
The thermoelectric offset voltage due to the switch card and the interconnecting cable may be compensated for by using a short-circuited channel to establish a zero reference. 由于开关卡和互连电缆引起的热电效应偏移电压可采用一个短路通道来建立一个零参考，从而进行补偿。
I groped for the light switch in the dark room. 我在黑暗的房间里摸索着找电灯开关。
To verify a switch card's specifications, the contact potential can be measured with a sensitive voltmeter. Refer to the switch card's operating manual for the specific procedures for that card. 若需验证某个开关卡的技术指标，可利用灵敏的伏特计测得其接触电势。关于开关卡的特定操作程序，请参阅开关卡的使用手册。
As more switch cards are added to expand the system, the maximum allowable test frequency may decrease. 当通过增加开关卡扩展系统时，最大允许测试频率将下降。
If using a switch card with Form C switches (SPDT), this can be done by connecting an ohmmeter in place of the unknown source on each channel. 如果使用C型开关（SPDT）的开关卡，则可以连接一个欧姆表代替每一通道上的未知源。
Do not connect switching cards directly to unlimited power circuits. 请勿将开关卡连接至功率不受限的电路。
In general, there are four types of connections on switch cards: screw terminals, mass-terminated connectors, coax connectors, and triax connectors. 一般而言，开关卡有4种连接类型：螺栓端子、连接头、同轴连接器和同轴三柱器。

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