Basics of analog & digital sensor signals
There are a variety of ways that sensors and transmitters can communicate measurement information. This article provides a general primer for the common signals used for industrial measurement and control.
What are analog signals?
Analog signals are continuous electrical signals that represent the measurement variable. The analog signal could be based on either voltage or current. The signal is scaled based on the range of the measured variable. A possible analogy for an analog signal could be something like a dimmer control for a light bulb. As the dimmer control is moved the intensity of the light changes.
