In a test of the accuracy of a pneumatic comparator, how should test point readings be made?

To assess the accuracy of a pneumatic comparator effectively, it is essential to take test point readings as the pressure is both increased and decreased. This approach allows for the observation of hysteresis and ensures that the device's performance can be evaluated across the full range of its operational capabilities.

When pressure is increased, the response of the comparator can be evaluated; similarly, when pressure is decreased, any variations in the output can be detected. This two-directional test provides a comprehensive understanding of the comparator's behavior, including any discrepancies that might arise due to mechanical or calibration issues.

Taking readings in just one direction—whether increasing or decreasing—can lead to incomplete data, failing to reveal potential inconsistencies that could guide adjustments or recalibrations. Therefore, measuring across both ranges is critical for a thorough and balanced assessment of the pneumatic comparator's accuracy.