WSDA
®
-2000 User Manual
The conversion formula assumes a linear relationship between the original units (such as A/D bits)
and new engineering units (such as ), and it is expressed mathematically as
y=mx+b
, where
y
is the
engineering units at a given point (measurement),
m
is the slope of the line that represents the linear
ratio,
x
is the original unit value at a given point, and
b
is a unit conversion offset (in the case of unit
conversions) or the fixed zero load offset of the sensor (in the case of measurement calibration
coefficients). Negative values may be entered for any coefficient.
Slope: is the linear scaling slope coefficient. The slope is the ratio of original units to new
engineering units (EU), and it is used to convert the sensor measurements. The slope conversion
value will vary depending on the engineering units desired. For example if the original unit is A/D
values (bits), and the desired engineering units are acceleration in g-force, the slope conversion
would describe how many bits equal one unit of
g
-force (bits/
g
). Mathematically, the slope is
m
in the
formula
y = mx +b
.
Offset: is the linear scaling offset coefficient, and it is typically the starting output value of the sensor
with no load applied (in the original units). Mathematically, the offset is
b
in
y = mx +b
.
Low Limit: optional data threshold value that will generate a data- out- range indicator if
measurement is below the value
High Limit: optional data threshold value that will generate a data- out- of- range indicator if
measurement is above the value
Unit: user defined long name of calibrated unit
Symbol: user defined short name of calibrated unit
EXAMPLE:
Sensor node 34163 is measuring temperature in degrees Celsius on channel 1. Calibrated data is
desired to be in Fahrenheit with indicators if the measurement goes below 0 F or above 100 F. The
conversion for Celsius to Fahrenheit is: F = C*1.8 +32 (y = mx +b)
Address
Channel Slope Offset
Low
Limit
High
Limit
Unit Symbol
34163 ch1 1.8 32 0 100 Fahrenheit F
33
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