Advertisement
Serial Numbers &
Calibration Records
Calibration Factors
Converting Hz to
Degrees C
Example
VW Temperature Sensor, 2012/6/20
Each VW sensor has a unique calibration. Use the sensor serial number
to match the sensor with its calibration record. There are two alternate
data reduction methods; be sure to match the sensor to the method.
METHOD A - Five factors
The calibration record lists coefficients that are used in a polynomial
expression to linearize the Hz readings and convert them to engineering
units. The VW temperature sensor lists five factors, A, B, C, D, and E,
which are used to convert the Hz reading to degrees C.
Apply the calibration factors as shown in the equation below:
4
Temperature = (A x F
)+ (B x F
Where:
Temperature is in Degrees C,
A, B, C, D, and E are factors on the sensor calibration
record,
The Hz reading is 1284.6. What is the temperature in degrees C?
Find the sensor calibration record and identify the five factors: A, B,
1.
C, D, and E.
Apply the calibration factors to find the answer of 60 degrees C.
2.
Factor
Hz Reading
A
1.6224 x 10E-1
12844.4
B
-4.56464 x 10E-7
12844.4
C
6.8648 x 10E-4
12844.4
D
-328319 x 10E-1
12844.4
E
-1.18733 x 10E-3
Temperature in degrees C
Data Reduction
3
2
) + C x F
) + (D x F) + E
Value
4
316.4954
3
-967.6321
1132.8273
2
-421.6929
-0.001187
59.99
5
Advertisement
