AutoQuiz: What Is the Difference Between a Digital Transmitter and an Analog Transmitter?

AutoQuiz is edited by Joel Don, ISA’s social media community manager.

AutoQuiz20150925Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for information about the CCST program. This question is from the Level I study guide, Domain 1, Calibration. Level I represents a professional who has a five-year total of education, training, and/or experience.

What is the difference between a digital transmitter and an analog transmitter?

a) a digital transmitter is a microprocessor digital device that can communicate
b) digital transmitters are an enhanced version of an analog transmitter
c) analog transmitters measure more accurately than a digital transmitter
d) there is no difference
e) all of the above

 

Click Here to Reveal the Answer

An analog transmitter measures in real time, has a measurement accuracy approximately 1 percent and is very responsive. A digital transmitter is microprocessor-based and measures in sampled time. Its measurement is digitized, it is generally not as responsive as analog transmitter, it can communicate digitally with other devices and can be easily re-ranged. A digital transmitter has a measurement accuracy of approximately 0.1 percent.

The correct answer is A.

 

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