Electrical isolation of an analog I/O module specifies how accurately an analog value can be represented digitally.

• A. True
• B. False
• C. It determines isolation level
• D. It determines sampling rate

Answer: (B)

Electrical isolation is about separating circuits to protect equipment and operators and to prevent noise or voltage from crossing the barrier. It defines safety and signal integrity across the barrier, not how precisely an analog signal is converted to digital values. The accuracy of the digital representation is determined by the ADC itself—the number of bits (resolution), reference stability, noise, and linearity—along with front-end conditioning and sampling behavior. So isolation does not specify how accurately the analog value is represented in digital form. That’s why the statement is false. The isolation level and the sampling rate are separate concerns and do not dictate digital conversion accuracy.