Bowers Group Sylvac D100S Readouts - Manual (Page 23)

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1.6.9 STAT KEY
Allows two types of statistical results to be displayed:
Choice of display:
1/ press 2/ then appears:
1 = display of classical statistics and bar chart
2 = display of
_
X/R control charts
These are the measured values, stored in memory using the Store key (refer to
Store key in Section 1.6.15), which are used. Each channel (1 to 64) can
have an independent statistic. The statistical results can also be given on the
Centronics and RS232 links in order to be printed or dealt with by computer.
The bar chart may be printed in 80 or 40 columns, while the
_
X/R cards may
be printed in 80 columns (refer to Print key in Section 1.6.14).
First choice: bar chart
1/ Press key . Following display will appear:
N = number of stored values = used for statistical analysis
Xmax = maximum stored value
Xmin = minimum stored value
R = Range = Xmax - Xmin
_
X = mean value =
σ (sigma) = standard deviation =
s = standard deviation = standard deviation of population based on a sample
The key allows statistical results to be printed via the Centronics or RS232 according to the selected format. It
is also possible to press Print in the following displays.
Statistical results may also be requested in scanning mode. The unit will first request the channel on which statistics are
required, and at the end request the next channel (if 0 is chosen as channel number, the statistics of all channels will
be printed).
2/ if the unit is in tolerance display mode, the next display can be requested with
Exit statistics mode with or .
CHANNEL 1
N
= 112
Xmax = 10.007
Xmin = 9.990
R = 0.017
x = 10.000
σ
= 0.0020
s = 0.0020
Enter the choice :
1 : Histogram
2 : X/R - chart
X
i
i=1
N
N