10 - Math Functions
Applying calculations to measurements
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SMU4000 Series Instruction Manual
MATH FUNCTIONS
CNFG >
[Source Measure Action] Manual Setup > [Results] Math
Applying calculations to measurements
The Math operation menu provides a set of mathematical calculations that can be performed on
the primary measurement data. Math operations are applied to the active operating mode. If
the mode is changed, only math operations set for that specific mode will be active.
Many of the Math operations require a reference value which can be manually entered or set to
the live measurement value, from the Math menu. Once a math function has been selected.
The reference value can also be set directly from the sample table or graph, see ‘
or ‘
’ for more details. The reference value is assigned per measurement type, per mode.
The active math operation is shown on the home screen.
The operations available are:
Deviation (relative offset)
Displays measured results as a deviation (or relative offset) in relation to the specified reference
point.
Measured results = (measurement - reference)
% Deviation
Displays measurement results as a percentage deviation in relation to the specified reference
point.
Measured results = 100 x (measurement - reference) / reference
When the measurement is less than the reference, the measured result will be shown as a
negative value. When the measurement is greater than the reference it will show a positive
value.
% Ratio
Displays measurement results as a percentage ratio in relation to the specified reference point.
Measured results = 100 x measurement / reference
mx+b
Displays measurement results as shown in the following equation:
Measured results = (m x measurement) + b
m
is a user specified multiplier value.
B
is an offset value that can either be set as a user specified custom value or a live reference
point.
Measure
CNFG >
[Source Measure Action] Manual Setup > [Results] Measure
The Math Measure configuration selects which measurement the math operation will be
applied to.