The relative method measures the cumulative pitch error ΔF_p of the gear pitch, which is an indirect measurement method, that is, the cumulative error of the pitch is obtained by adding up the pitch deviation. The measurement of the pitch deviation is the direct observation Δi, which is obtained by calculation. Since the direct observation has a measurement error, when calculating the cumulative error of the pitch, these measurement errors are also added up, which becomes the measurement method error of the cumulative error of the pitch. This measurement method error will affect the measurement accuracy of ΔF_p. It is well known that the cumulative value of K pitch deviations is:
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