Mahr Digimar 817 CLM Operating Instructions Manual - page 119
119
Mahr GmbH • Digimar 817 CLM
Lo. relia.
:
Lower reliability limit of the mean value. Shows the limits within which the mean value of the
population lies. The reliability is 95%.
Sigma
:
Standard deviation. The mean root square deviation was computed on the basis of n-1
workpieces.
Up. relia.
:
Upper reliability limit of the standard deviation. Shows the limits within which the standard
deviation of the population lies. The reliability is 95%.
Lo. relia.
:
Lower reliability limit of the standard deviation. Shows the limits within which the standard
deviation of the population lies. The reliability is 95%.
Range
:
Range, i.e. difference between maximum and minimum measuring value.
Number of pcs :
Number of workpieces matching the selection criteria.
Min-/Maximum :
Smallest/ largest measured value.
Cm
:
Machine capability index, Cm = (Up.Tol.-Low.Tol.) / 6 sigma. The machine capability index
assumes a standard distribution.
Cmk
:
Machine capability index with respect to the mean value’s situation relative to the tolerance
limits. The Cmk value should be larger than 1.33. The machine capability index assumes a
standard distribution.
+3 Sigma
:
3 standard deviation values are added to the mean value. Indicates the upper value limit of a
normal distribution above which less than 0.2% of all sizes lie.
-3 Sigma
:
3 standard deviation values are subtracted from the mean value. Indicates the lower value limit
of a normal distribution below which less than 0.2% of all sizes lie.
The machine capability index only provides useful information if a homogeneous lot was checked in a preliminary
data collection run (e.g. for computing the control limits).
Information
Data
:
Name of the evaluated measuring programs.
Workpiece
:
Number of workpieces measured with this program
No. errors
:
Number of workpieces measured with this program and classified as „Rejects“.
Total weighting :
Sum of the weighting factors of all classes.
Attrib. data only :
Selection criteria to which the workpieces were subjected.
Error
:
Name of the error or the measuring function.
Class
:
The number of the error class of x selected classes.
Step No.
:
The number of the program step.
No. errors
:
The number of errors falling into this class.
%
:
The frequency of this error with respect to all errors (expressed as percentage).
Weight
:
The weighting factor assigned to this class. The weights of the classes are only displayed
if function „Display weighted Pareto chart“ is selected.