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8-16
be possible to get by with 4, especially since the slope rating is somewhat
conservatively specified on most DFG'so
Hence a setting of 4 was tried.
As might be expected, there was difficulty in setting the value at point 50
The smallest value obtainable was about a quarter-inch above the curve.
(About 00025 unit.)
The slope multiplier switch was set to the next higher
value (8) and the setup was repeated.
Note that when the slope amplifica-
tion is changed, it is necessary to go back to the beginning and reset every
previously set function value, starting with the PARALLAX setting, since
doubling the gain will double the entire function up to that pointo
How-
ever, the breakpoint settings do not have to be reset; they are unaffected
by the slope amplification switch.
With a slope setting of
8~
the setup proceeded smoothly.
No difficulty
was observed in setting function values.
A continuous plot made after the
setup was completed indicated that the plotted function was virtually indis-
tinguishable from the original hand-drawn curve over most of its length, and
that the maximum deviation was about 0.3%.
No trimming adjustments were
necessary.
8
0
4
0
6
Eleven-Segmen~
Functions
At this point, the reader may be wondering what "Breakpoint 1" is for.
The
setup procedure calls for ignoring this breakpoint pot and its corresponding
position on the segment selector.
This breakpoint is usable for twenty-seg-
ment functions (see Paragraph 8.4.6) and, under certain conditions, for eleven-
segment functions
0
Whenever the function to be generated is initially horizontal (that is, f'(O)
=
0), then the function may be generated with eleven segments instead of ten.
The additional segment is horizontal.
An
example of such a curve is given
in Figure 8
0
7, and a corresponding table of values is given in Table 8
0
3.
Note that since the first segment is horizontal, the value- at the first break-
point is the value at the or1g1n.
In fact, since the value at a given break-
point is set by adjusting the slope at the previous breakpoint, there is no
control for adjusting the function value at breakpoint number one
o
Table 8.3
Segment
x
f(x)
Segment
x
f(x)
Selector
Selector
OFF
0.00
0.33
6
0.46
0.84
1
0.06
0.33
7
0.52
0.84
2
0.12
0.36
8
0060
0.82
3
0.18
0
0
42
9
0.70
0.76
4
0.34
0.72
10
0.84
0.60
5
0.40
0.80
OFF
1
0
00
0.32
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