Vertical resolution is measured in?

Vertical resolution in digital instrumentation refers to the ability of a system to distinguish between different levels of amplitude in a signal. Since each level can be represented by a certain number of bits, it's important to focus on how amplitude relates specifically to vertical resolution. Each bit in a digital system typically doubles the number of distinguishable amplitude levels, thereby enhancing the system's capability to accurately represent and interpret the signal.

Measurements of vertical resolution are crucial in applications such as EEG or other electrodiagnostic procedures, where the exact amplitude of the signal can affect diagnostic outcomes. While bits play a significant role in determining the overall vertical resolution (indicating how many levels of amplitude can be represented), the direct measurement and focus of vertical resolution pertains to the amplitude itself.

Therefore, the correct context for vertical resolution is indeed linked to the measurement of amplitude, making it the appropriate choice in this case.