Front Panel Operation
2-105
2.18 Math
Model 6517A math operations are divided into four catego-
ries:
• Math performed on single readings (polynomial, per-
cent, percent deviation ratio and logarithmic).
• Math performed on buffered readings (maximum and
minimum values, average, and standard deviation).
• Math performed on single readings as a part of a pass/
fail limits test.
The first category is configured from the CONFIGURE
MATH menu and is described in this paragraph. Math oper-
ations on buffered readings are available in multiple displays
of recalled data and are discussed in paragraph 2.16.3. Limit
tests are described in paragraph 2.19.5, under main menu op-
erations.
Note that once enabled for a function, the CONFIGURE
MATH calculations are in effect across function changes.
NOTE
The Model 6517A uses IEEE-754 floating
point format for math calculations.
2.18.1 Polynomial
This math operation allows you to mathematically manipu-
late normal display readings (X) according to the following
polynomial calculation:
Y = (a2)X
2
+ (a1)X + (a0)
where: X is the normal display reading
a2, a1 and a0 are user entered constants
Y is the displayed result
The value of the “a2”, “a1” and “a0” constants can be
changed through the CONFIGURE MATH menu (see para-
graph 2.18). The before and after calculation can be viewed
with one of the multiple displays, as described in paragraph
2.18.8. When necessary, the resulting Y value is displayed in
scientific notation.
2.18.2 Percent
This operation lets you specify a target reading value. The
displayed reading will be expressed as a percentage of the
target value, often in scientific notation. The percentage cal-
culation is performed as follows:
As an example, consider the default target value for percent-
age calculations, where:
Therefore, a 1V input would be 100% of the target value and
a typical reading would be displayed as follows:
+100.000 V%
With the calculate multiple display selected, as described in
paragraph 3.18.8, the display would be:
+100.000 V%
Reading = +1.00000
where the bottom line shows the reading (in the units and
multiplier prefix of the top line) before the percentage calcu-
lation is performed.
2.18.3 Percent deviation
The following math calculation provides the percent devia-
tion between the normal display reading and the user speci-
fied reference value:
where: X is the normal display reading
Y is the specified reference value
Percent Deviation is enabled through the CONFIGURE
MATH menu (see paragraph 2.18.7).
2.18.4 Deviation
The following math calculation provides the deviation be-
tween the normal display reading and the user specified ref-
erence value:
where: X is the normal display reading
Y is the specified reference value
Percent
Input
Reading
Target
Value
----------------------------------
x
100
=
%Dev
XY–()
Y
-----------------
x
100
=
Deviation
XY–()
Y
-----------------=
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