Before generation
Use this planner before collecting data when an investigation may fail to distinguish expected changes or may exceed the instrument range. It counts nominal scale intervals, compares adjacent expected differences with the entered resolution, and surfaces changes smaller than two increments for redesign or closer review. It can inform equipment choice and sampling points, but it does not calculate a complete uncertainty budget, establish accuracy, or certify that a sensor responds quickly enough.
Worked example
A fictional cooling investigation uses a thermometer spanning -20 to 120 degrees Celsius with 0.1 degree resolution. Expected checkpoints of 82.0, 78.4, 61.7, 31.2, and 22.6 degrees are all within range. Their adjacent differences span many resolution intervals, so the planning rule marks them distinct. The report also shows a nominal half-resolution floor of 0.05 degree while warning that calibration, response time, and environmental uncertainty remain separate.
Formula or methodology
Instrument span equals maximum minus minimum. Nominal scale intervals equal span divided by resolution. For adjacent checkpoints, absolute change equals the absolute difference between expected values, and resolution ratio equals that change divided by resolution. The disclosed planning flag calls a change distinct when it spans at least two resolution intervals. Half the smallest increment is displayed only as a nominal reading floor, not as total uncertainty.
How to interpret the result
A distinct flag means the expected separation exceeds the chosen two-increment threshold under idealized resolution arithmetic. A review flag suggests increasing the change, choosing a finer instrument, changing the method, or accepting that the planned contrast may be unresolved. Large ratios do not guarantee good data if values fall outside calibration, the response is slow, systematic bias dominates, the sample changes between readings, or the expected model is wrong.
Common mistakes
Do not choose equipment only by its number of displayed decimals, confuse range with resolution, assume half an increment is the full uncertainty, ignore values near range limits, or plan checkpoints closer than the apparatus can distinguish. Review calibration and zero checks, response time, loading effects, units, parallax, data-logger quantization, repeats, environmental control, significant figures, and the approved risk assessment before beginning the investigation.
