Instrument Mechanician Trade Test Practice Questions - South Africa Artisan Trade Test - Instrument Mechanician Exam

What does the HART protocol superimpose on the 4-20 mA analogue signal to provide digital communication?

A high-voltage spike A frequency-shift-keyed (FSK) digital signal averaging to zero A DC offset of 2 mA A 50 Hz mains hum

Correct Answer:

A frequency-shift-keyed (FSK) digital signal averaging to zero

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