manualrange

Manualrange is a setting in devices and software that allows the operator to specify the usable range of a parameter by hand, typically by entering bounds or selecting presets. It contrasts with auto-ranging, where the system determines limits dynamically.

In practice, manual range is used to improve measurement accuracy, safety, or control in scenarios where automatic range selection is undesirable due to known conditions, calibration requirements, or expert preference. It is commonly found in measurement instruments, control systems, and consumer electronics, where knowing and fixing the range helps ensure stable performance and predictable behavior.

Common characteristics include explicit minimum and maximum values, optional step size or resolution, unit specification, and a lock or override mechanism that prevents accidental changes. Implementation may store the range in hardware registers, firmware configuration, or software preference files. Changing the manual range may require reinitialization or recalibration of the system to reflect the new bounds accurately.

Examples of use include voltmeters and oscilloscopes, where manual range fixes the input span to a chosen voltage range; cameras, where a manual range might apply to exposure settings or focus depth; CNC machines and robotics, where positional limits are defined to prevent out-of-bounds movement; and data entry or validation systems, where input values are constrained to a user-defined interval.

See also auto ranging, calibration, range setting.