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用隔离的4～20mA发射机(例如Burr-Brown公司的IXR100产品),可以构成简单而又完善的远程测试系统,这类测试系统往往有一只内置的μP(微处理器)。如果远程系统还需要报告其全部运行状态,那和用一条线路在提供有关被测过程模拟信息时,就会产生困难。图1所示简单的监视电路允许使用同样的线路通过闭合或断开4～20mA环路来提供有关系统运行的补充信息,这种电路的一个主要优点是它与主机系统是完全隔离的,从而避免了不必要的接地回路和其他潜在的损环。
Using an isolated 4-20mA transmitter (such as the Burr-Brown IXR100 product) provides a simple and complete remote test system that often has a built-in μP (microprocessor). If the remote system still needs to report on its full operational status, it would be difficult to provide a simulation of the process under test with one line. The simple monitor circuit shown in Figure 1 allows the same circuitry to provide additional information about system operation by closing or breaking a 4-20 mA loop. A major advantage of this circuit is that it is completely isolated from the host system so that Avoid unnecessary ground loops and other potential damage.