4 ms·
In industrial automation, one old and popular analog signal scheme is the 4–20 mA current loop [1]. Why 4mA instead of 0mA? Because that way, you know 0mA speci
by sidpatil 4y ago
In industrial automation, one old and popular analog signal scheme is the 4–20 mA current loop [1]. Why 4mA instead of 0mA? Because that way, you know 0mA specifically indicates a fault caused by a failed sensor, break in the line, etc.
[1] https://en.wikipedia.org/wiki/Current_loop https://en.wikipedia.org/wiki/Current_loop