IR测试系统中采用的开关卡的设计和类型取决于多个因素，包括测试电压、电阻数量级、准确度、共用连接，等等。
The design and type of switching CARDS used in an IR test system depend on several factors, including the test voltage, magnitude of resistance, accuracy, com mon connection, etc.
熟悉各种测试设备，如：耐压测试设备，负载测试设备，空载测试设备，电阻测试设备等等。
Be familiar with all kinds of test equipment such as equipment of endurance test, loading test, no-load test, resistance test etc.
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