HEIDENHAIN ND 287 User Manual - Manual (Page 42)

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I Working with the ND 287 position display unit
I – 5 Ser
ies of measur
ements and statistical
pr
ocess
c
ontr
ol I – 5 Series of measurements and
statistical process control
Functions
In addition to displaying measured values, the ND 287 can record and
evaluate measured values as a series of measurements, and can
perform Statistical Process Control (SPC).
You can record series of measurements with up to 10000 measured
values per connected axis
. The recording of the measured values
can be initiated manually, externally or according to time. After the
series of measurements has been recorded, you can immediately
evaluate it on the ND 287 and display it as a table or a graph. The
measured values can also be exported.
For statistical process control, the ND 287 can store up to 1000
measured values
in a non-volatile FIFO memory. After the required
parameters have been defined and SPC has been started, samples of
the measured values to be monitored are recorded. After a sufficient
number of measured values has been recorded, the measured values
accumulated so far can be evaluated. In addition to displaying the
measured values, basic statistical data and a histogram, the ND 287
can also calculate and display the process capability indices Cp and
Cpk
as well as various quality control charts. For fundamentals on
quality capability characteristics, refer to ISO 21747.
Switching between series of measurements and
SPC mode
To switch between the MEAS. SERIES and SPC mode:
 Press the MEAS. SERIES [SPC] or SPC [MEAS. SERIES] soft key
(depending on which of the two soft keys is displayed) in the first
soft-key row of the standard screen.
 This opens the SERIES OF MEASUREMENTS or SPC -
STATISTICAL PROCESS CONTROL menu.

To switch the mode, press the MEAS. SERIES [SPC] or SPC [MEAS.
SERIES] soft key.
Fig. I.35 Measurement Series [SPC] mode