HEIDENHAIN ND 287 User Manual User Manual

Page 51

ND 287

I – 5 Ser

ies of measur

ements and statistical

ocess

ontr



Press the CONTROL CHART s soft key to display the control chart

for standard deviation s (s chart). The standard deviation s of each

sample is entered in this control chart. The control chart shows up

to 30 of the last values. Use the

⇐

and  soft keys to scroll the

graph forward or backward by 25 measured values at a time. The

control chart also shows the upper control limit for the standard

deviation UCL s, and the mean value of the standard deviations .

The ND also shows the calculated value .



Press the CONTROL CHART r soft key to display the chart r. The

range r is the difference between the smallest and the largest value

of a sample. It is a measure of the statistical spread of the process.

The chart shows up to 30 of the last values. Use the

⇐

and  soft

keys to scroll the graph forward or backward by 25 measured values

at a time. The control chart also shows the upper control limit for the

range UCL r,, and the mean value of the ranges . The ND also

shows the calculated value .



Press the SPC ANALYSIS soft key to return to the overview of

statistical data.

Fig. I.54 Control chart s

Fig. I.55 Control chart r

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