Purpose of isolation amplifiers: what “isolation” actually means Evaluate the statement: “Isolation amplifiers are called that because they are physically sealed against environmental damage.” Decide whether this claim is valid and select the best explanation-oriented choice.

Introduction / Context:
Isolation amplifiers are used wherever a signal must be transferred between two circuits without a direct electrical (galvanic) connection, often for safety, noise immunity, or ground loop elimination. The term “isolation” refers to electrical isolation, not physical sealing against dust, moisture, or mechanical harm.

Given Data / Assumptions:

• Industrial and medical measurement systems frequently use isolation to protect patients, operators, and equipment.
• Common isolation methods: optical (optocouplers), transformer (magnetic), and capacitive coupling.
• Environmental sealing may be present in ruggedized packages but is not the defining feature.

Concept / Approach:
Galvanic isolation breaks the DC path between input and output. It enables high common-mode voltage tolerance and reduces ground-loop currents. Isolation amplifiers maintain signal fidelity across the barrier through modulation/demodulation techniques and coupling mechanisms while adhering to safety standards (creepage/clearance and isolation ratings).

Step-by-Step Solution:

Verification / Alternative check:
Review datasheets: isolation amplifiers specify isolation voltage (kV), common-mode rejection, and barrier technology; they do not primarily emphasize hermetic sealing unless for separate reliability reasons.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing ingress protection (IP ratings) or hermetic packaging with electrical isolation ratings; assuming a rugged package equals an isolation amplifier.

Final Answer:
Incorrect