10.
Multiply each
y
value
by
the corresponding
x
value and enter in
the x times y column. Total these values and enter in the Cxy
space.
11.
The equation for determining the best fit straight line
specification for each y-value is:
where a1 and a0 are constants to be calculated from the data
taken previously.
Note
Calculate the values of
a1
and
%
to at least five decimal places.
12.
First determine the value of a1 using the following equation:
Cxy
-
*
al
=
Ex2
-
n
where Cx, Cy, Cxy, CxCy,Cx2
,
and (cx)~, are the previously
calculated values entered on the Performance Test Record.
where n=9 (the number of points to be calculated).
13.
Determine the value of
Q
using the equation:
14.
Calculate the best-fit straight line y7 value for each point (yl
through y9) using the equation:
Enter each result on the Performance Test Record in the Best-Fit
Straight Line column.
15.
For each delay
(x),
subtract the calculated voltage (y') from the
measured voltage (y). Find the largest positive voltage difference
(+VmX) and the largest negative difference (-V,,,). Using the
following formula, compute the
%
linearity.
16. Add the voltages recorded in the Negative Slope Measurement
column algebraically and enter the total in the Cy space.
17.
Repeat steps
8
through
14
to determine the best fit straight line
values and linearity for the negative slope.
C-38
Performance tests
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