HEIDENHAIN ND 287 Kurzanleitung Seite 7

Sorting and Tolerance Checking
To sort the parts, the ND 287 compares
the displayed value with an upper or lower
sorting limit, and displays the sorting
result in color in the status display as a
value or with one of the symbols < = >.
In addition, a corresponding signal is
available at switching output X41. Press
the TOLERANCE CHECKING soft key to
open the form for defi ning the sorting
parameters and the sorting limits.
The sorting and tolerance checking
function is always effective for the
currently displayed value, also when
measurement series, minimum/
maximum display, SPC or coupled
positions are active.
Display Freeze
In order to read the display in spite of
quickly changing values, the display can
be frozen. The position value is counted
internally until a new display value is
called. You can freeze the display through
a switching signal "Output measured
value" to X41, the CTRL B command, or
by pressing the PRINT soft key.
The MEASURED VALUE OUTPUT
parameter in the Job Setup menu offers
the following possibilities for settings:
• Concurrent Display
The display value always matches the
measured value.
• Frozen Display
The display remains stopped, but is
updated by every measured value
output.
• Frozen/Con. Display
The display is only stopped during
measured value output.
Measurement Series
The ND 287 can store measurement
series with up to 10 000 measured
values. They can be evaluated internally
or they can be read out in a block.
Setup Series of Measurements
• Measured-value recording through the
ENTER key, an external signal or
sampling intervals.
• Number of measured values.
• Defi nition of sampling intervals (20 ms
to 60 s) and time slot.
Start Measurement Series
• By pressing START MEAS. SERIES.
• By sending an external signal to X41.
Switching-off the ND or starting a
new measurement series deletes the
values of the previously recorded
measurement series.
Stop Measurement Series
• Automatic stop when the defi ned
number of measured values is reached.
• By pressing STOP MEAS. SERIES.
Measurement Series Analysis
The measurement series can be
displayed as
• Statistical data
• Diagram
• Measured value table
Export Measured Values
Press the EXPORT soft key to start
transmission of the measured value table.
Minimum/Maximum Display
During the measurement series you can
press the SELECT DISPLAY soft key to
switch from the actual value display
(ACTL) to the display of the minimum
value (MIN), the maximum value (MAX)
or the difference between minimum and
maximum value (DIFF).
SPC Statistical Process Control
For Statistical Process Control, the
ND 287 can store up to 1 000 measured
values in a non-volatile FIFO memory.
SPC Setup
• Number of samples and data per
sample.
If you change these values, the
data in the FIFO memory will be
deleted.
• Upper and lower tolerance limits
(same as sorting limits) and nominal
value.
• Control limits for control charts.
• Distribution (symmetrical, left-hand or
right-hand limit).
• Measured-value recording through the
ENTER key or an external signal.
Record SPC Values
• Press the START SPC soft key to start
data acquisition for SPC.
• Press the STOP SPC soft key to
interrupt the SPC function. The
ND 287 is then available for other
measuring tasks.
• Press the START SPC soft key to
restart measurement of the defi ned
number of samples.
• The sample counter in the message
line indicates the number of the
current sample being measured, the
number of the measurements
performed and the total number of
samples to be measured.
Before starting a new SPC
measurement, select DELETE
STATISTIC to delete old SPC values
from the FIFO memory.
SPC Analysis
While the data is being measured, the
ND can display the current status as
• Statistical data
• Graph (for the last 30 values)
• Histogram with 10 classes
• Control chart for average value x,
standard deviation s and range r
(difference between maximum and
minimum value) of a sample
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