In an 0-10 V analog input card with 8-bit resolution, what is the voltage increment per step?

• A. 0.0390625 volts per step
• B. 10/256 volts per step
• C. 0.5 volts per step
• D. 1 volt per step

Answer: (B)

With an 8-bit input, the range is divided into 2^8 = 256 discrete levels. The voltage increment per step (the LSB) is the full-scale range divided by the number of levels. For a 0–10 V span, that’s 10 V / 256, which equals 0.0390625 V per step. Expressed as a fraction, it’s 10/256 V per step, and both forms represent the same increment. Choices like 0.5 V per step or 1 V per step would correspond to far fewer levels across 0–10 V, not matching an 8-bit resolution.