The five-point method of calibration checks the device output at which intervals?

The five-point method of calibration involves checking a device's output at specific intervals represented by a series of targeted percentages. This method is designed to ensure that the device accurately responds across its entire range of operation.

Using a stimulated signal at five representative percentages allows for a comprehensive assessment of the device's performance at various points. By testing at these intervals—often including 0%, 25%, 50%, 75%, and 100%—the technician can identify how well the instrument responds to changes in input throughout its operational range. This thorough approach helps to reveal any non-linearities or deviations from expected performance that may occur at specific points along the range.

The rationale behind this method lies in its ability to ensure that the instrument delivers accurate readings and functionality across its full scale, which is critical for maintaining the integrity of measurements in industrial settings. This creates a detailed profile of the device's behavior, allowing for timely adjustments or repairs as necessary.

Other potential methods described, such as specific fixed currents or repeated measurements at zero and full scale, may not provide the same comprehensive understanding of the device's performance throughout its range, thus not being as effective in ensuring calibration accuracy.