Front Panel Operation
3-93
3.10.2 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, on the 200µA range, a 100µA input would be
0.01% of the target value and a typical reading would be dis-
played as follows:
+1.0000e+04µAAC%
Range: 200 µAAC Coupling: AC
Note that the value is not 10000%, but 10000µ%, which
equals 0.01%. With the calculate multiple display selected,
as described in paragraph 3.10.5, the display would be:
+1.0000e+04µAAC%
Reading = +100.000
where the bottom line shows the reading (in the units and
multiplier prefix of the top line) before the percentage calcu-
lation is performed.
3.10.3 Percent deviation
The following math calculation provides the percent devia-
tion between the normal display reading and the currently
stored REL value for the selected function:
Where: X is the normal display reading
Y is the REL value for the selected function
PD is the displayed percent deviation result
Percent Deviation is enabled through the CONFIGURE
MATH menu as described in paragraph 3.10.4 below.
Note that Percent Deviation does not scale based on the m, k,
or M range factor. For example, 10% deviation on the 20k
Ω
range will be displayed as 10.00000. If the number is too
large for the allowed number of leading zeroes (for example
10 on the 2k
Ω
range), the display will switch to 7-1/2 digit
scientific notation.
3.10.4 Configuring math
The mX+b, percent, and percent deviation math operations
are programmed from the CONFIGURE MATH menu. The
selections are shown in Table 3-38.
To program the math parameters from the normal reading
display, press the CONFIG key, and then the MATH key to
access the following menu:
CONFIGURE MATH
NONE mX+b PERCENT
NONE
With this menu item, no math operation goes into effect
when the MATH key is pressed. The MATH annunciator
lights, but NONE is displayed on the top line.
mX+b
This menu item allows you to program the mX+b constants,
where m is the scale factor, and b is the offset. After high-
lighting the mX+b selection and pressing ENTER, the de-
fault display shows:
m = +1.000000e+00
Use the cursor ( and ) and RANGE keys to move
among the digits and set their desired values. Once the scale
factor is configured, press ENTER to view the following de-
fault display:
b = +0.000000e+00
The cursor and RANGE keys are used to set the desired val-
ue of offset. Pressing ENTER returns you to the CONFIG-
URE MATH menu.
Percent
Input
Reading
Target
Value
----------------------------------
x
100=
100%
=
+1.000000e+00
PD
XY–()
Y
------------------
100%×=
Table 3-38
CONFIGURE MATH menu structure
Menu item Description
None
mX+b
Percent
Percent deviation
Select no calculation when MATH
key is pressed.
Select mX+b calculation and enter
constants.
Select percent calculation and enter
target (reference) value.
Select percent deviation calculation.
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