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3.4 Graphic print-out
The printing recorder is fitted with a print head which always has 6 colour
pens, regardless of the number of channels. For the 3-channel version the col-
our sequence is: violet, red, black, violet, red, black. For the 6-channel version
it is: violet, red, black, green, blue, brown. This means that in the 3-channel
version the colours last twice as long. When using the setup program, if col-
ours are assigned to a 3-channel recorder which are not available (green, blue,
brown), they will automatically be replaced (violet, red, black). The printing of
measurements and texts is always made in the same direction (unidirectional
printing).
The time which is needed to print out one line depends on the number of
points which have to be printed in this line. If the maximum number of points
are printed, then about 12 seconds are required for one line.
As the chart speed increases, more and more measurements, and so more
and more lines, have to be printed. So the printer must reduce the time which
it needs to try and print a line as the speed increases. These times can be seen
in the following table.
Speed (mm/h)
Up to a speed of 120mm/h every line can be printed in the time available,
since there are never more than 12 seconds required. At higher speed, if the
time taken to print a line is longer than the value in the table, then the lag is
compensated for by speeding up to the next line.
Example:
At a speed of 300mm/h the printing recorder attempts to print a line every 6
seconds, according to the table. But it needs 9 seconds to print a line. This is
compensated by increasing the speed by 50% for the next line.
The recorder has been so developed that the printed traces are always as vis-
ible as possible. For instance, an alternating print of the different colours
avoids a mixing and waste of colour if the measurements are the same.
3 Operation and visualisation
minimum time per line (sec)
5
10
20
60
120
240
300
360
600
720
288
144
72
24
12
9
6
5
4.8
4
27
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