A repetition rate, or operating frequency, lower than that allowed by the switching times is often specified for a relay.
继电器往往会以开关时间规定一个重复率，或者说是工作频率，使用时需低于该值。
Many electronic test systems use relay switching to connect multiple devices to sources and measurement instruments.
许多电子测试系统采用继电器切换的方式将多个装置连接到源和测量仪器。
Adopted solid state relay (SSR) as the heater's switching component.
并采用固态继电器SSR作为加热器的开关元件。
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