Measurement-computing DBK70 Manuel d'utilisateur télécharger pdf (Page 107)

Appendix B 937696 Scale & Offset in Summary View B-3

Calculating Output Scale and Offset Values for Analog Output Signals

Example 1

Calculate Output Scale and Offset for an analog output signal with a signal range 0 to 5 VDC being

equivalent to an RPM range of 0 to 10,000 RPM, where the resolution of the received data is 0.25 RPM/bit

and has a range of 0 to 16082 RPM. (i.e., V

= 5,000,000µVDC, V

= 0, D

= 10,000, RPM, D

= 0 RPM,

R = 0.25 RPM/bit, S

=0, and S

=16082):

Output Scale = [(V

- V

) / (D

– D

)] * R

= [(5,000,000 – 0) / (10,000 – 0)] * 0.25

= [5,000,000 / 10,000] * 0.25

= 500 * 0.25

= 125

Output Offset = [(S

-D

) / R] * Output Scale

= (0 - 0 / 0.25) * 125

= 0

Example 2

Create a full range analog output signal (i.e., 0 to 5 VDC) equivalent to a temperature range of

-50 °F to +250 °F, where the data received from the vehicle data bus has a resolution of 0.125 °F /bit and

has a range of -300 °F to 300 °F (i.e., V

= 5,000,000µVDC, V

= 0, D

= +300 °F, D

= -300°F,

and R = 0.125 °F/bit

Output Scale = [(V

- V

) / (D

– D

)] * R

= [(5,000,000 – 0) / (+250 – (-50))] * 0.125

= [5,000,000/300] * 0.125

= 16666.6667 * 0.125

= 2083.3333

Output Offset = [(S

-D

) / R] * Output Scale

= [(-300)-(-50)]/(0.125)] * 2083.3333

= -250/.125 * 2083.3333

= -2000 * 2083.3333

= -4166667

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Measurement-computing DBK70 Manuel d'utilisateur Page 107

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