The resolution of the spectrum increases with the number of spectral lines. The more spectral lines, the more information the spectrum contains. Increasing the number of lines also increases the required memory and time to measure the spectrum.

The spectrum consists of discrete spectral lines that display at fixed frequency intervals. The height of each spectral line represents the vibration amplitude at a frequency.

Use high-resolution measurements to distinguish between two closely-spaced vibration frequencies or when the Fmax is very large. The maximum for single-channel measurements is 12,800 lines. The maximum for two and four channel measurements is 6,400 lines.