What is the measurement accuracy of the Dimetix sensors with different σ values and what exactly does this mean?
The measurement accuracy of the Dimetix sensors is specified at ±2σ.
In the table on the left, the ±2σ accuracy specifications of the Dimetix sensors were converted into the commonly stated ±1σ and ±3σ accuracy specifications. The table also explains how this information must be understood.
It should be noted that the measurement accuracies of ±1σ, ±2σ and ±3σ always refer to the same statistical scatter, despite their different numerical values.
This can also be explained by the following example: The accuracy specifications of ±0.5 mm@1σ, ±1.0 mm@2σ and ±1.5 mm@3σ are the same, it is just expressed differently. See measurement accuracy.
How can other manufacturers accuracy specifications be compared with the Dimetix accuracy specifications?
Only a few sensor manufacturers specify the measurement accuracy at ±2σ. For a meaningful comparison, these accuracy specifications must therefore be converted.
The figure on the lower left shows the general formula to calculate the accuracy @ ±2σ from the accuracy @ ±Nσ.
The figure also shows a conversion example. At first glance, the accuracy of ±1.0 mm seems comparable to the Dimetix Dxx-10-xxx sensors (e.g. DPE-10-500). After the conversion, however, it turns out that this sensor measures two times less precise.