Automation System
Digital signals:

can have three possible levels
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
have a frequency measured in units of hertz
None of these

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Automation System
What is offset error?

the difference between the sensor input and the absolute sensed parameter.
the difference between the control setpoint value and the actual value.
All of these
None of these
the difference between the controller output and the setting of the manipulated variable.

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