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- Q634 - General Subjects
129. Which of the following illustrations represents the proper method of circuit grounding for a low level analog signal cable
Choice A is correct; the cable shield is grounded at the signal source to provide noise shielding and prevent ground loops. Grounding the shield at only one end establishes a low-impedance path for noise while isolating the measurement device from ground currents. Options B and C are incorrect due to improper grounding, and option D creates a ground loop. Proper shielding requires a single ground connection to avoid introducing noise into the signal.
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