View the Quality R chart
- Last UpdatedApr 28, 2025
- 2 minute read
An R chart is a type of control chart that monitors the process standard deviation approximated by a sample moving range (maximum sample value - minimum sample value) for successive samples of constant size. The R chart plots one point per configured samples series. Each point displayed is actually the range of the values contained in the sample series.
R chart options
|
Option |
Description |
Valid Values |
|---|---|---|
|
Field to chart |
Select one or more fields to include in the chart data. |
Any numeric custom field |
|
Time field |
Specify which time the data to include belongs to. |
Sample Period or Modified Date |
|
Specification limits to chart (LSL, USL) |
Shows up to 10 pairs of configured LSL and USL value pairs from which you can select a pair to plot. These pairs appear in chronological order with the newest pair appearing first in the list.Only the first 10 available pairs display in the list. This applies only to three views in the Quality module, Material Quality, Calculated Quality by Lot Group, and Calculated Quality by Lot Group Over Time. |
Lower Specification Limit (LSL) and Upper Specification Limit (USL). |
|
Sample size |
Specify the number of field values for the statistical grouping. |
Any number from 2 to 25 |
|
Statistical process control |
Applies statistical process control to the chart |
Mean, 1 Sigma, 2 Sigma, 3 Sigma, USL, LSL, Cpk, WECO Rules, UCL, r, LCL |