Analog Signal
What type of signal changes smoothly and continuously over time?
Analog Signal
What type of data do digital signals use?
Binary (0s and 1s)
What is the lowest current in the standard?
4 mA
What do analog instruments usually measure?
What is one advantage of digital systems over analog?
They can transmit multiple variables and are more accurate
What does 20 mA represent?
The maximum measured value
What unit is commonly used to send analog current signals?
Milliamps (mA)
What is a common disadvantage of digital systems?
They are more complex and expensive
Why is 4 mA used instead of 0 mA as the “zero” point?
Because 0 mA means a broken wire or system fault
What is one main disadvantage of analog signals?
They can be affected by electrical noise
What is the main reason industries are moving to digital?
Easier integration, remote monitoring, and data analysis
If a transmitter sends 12 mA, what does it mean?
The process value is at 50% of the range
Why can analog signals lose accuracy over long distances?
Because of signal degradation or interference
Why do companies upgrade from analog to digital systems?
To get more accurate and faster data
What does the “mA” in 4–20 mA mean?
Milliamps — a small unit of electric current