Set the decimal precision of all of the calculated values using the ChartData.DefectiveDecimalPrecision property.
Me.ChartData.DefectiveDecimalPrecision = 3
Set the decimal precision of the alarm limits using the code below.
Dim i As Integer
For i = SPCChartObjects.SPC_CONTROL_TARGET To Me.PrimaryChart.ControlLimitData.Count - 1
Dim controllimititem As SPCControlPlotObjectData = Me.PrimaryChart.GetControlLimitData(i)
controllimititem.LabelDecs = 3
Next
For i = SPCChartObjects.SPC_CONTROL_TARGET To Me.SecondaryChart.ControlLimitData.Count - 1
Dim controllimititem As SPCControlPlotObjectData = Me.SecondaryChart.GetControlLimitData(i)
controllimititem.LabelDecs = 3
Next