Omega Vehicle Security DMD-480-S2 user manual Write TWO Equations, Subtracting Equation B from a

D M D - 4 8 0 - S 2 S E R I E S A C P O W E R E D B R I D G E S E N S O R - R S 2 3 2 I N T E R F A C E

1.APPLY 3 mV TO THE INPUT AND READ THE 10% DIGITAL COUNTS AS THE OUTPUT (K1).

2.APPLY 30 mV TO THE INPUT AND READ THE FULL SCALE DIGITAL COUNTS AS THE OUTPUT (K2)

3.WRITE TWO EQUATIONS:

A)(K2 x A) + C = 0.030 VOLTS

B)(K1 x A) + C = 0.003 VOLTS

SUBTRACTING EQUATION B FROM A:

(K2 - K1) x A = 0.027 VOLTS

THEREFORE A = 0.027 VOLTS ⎟ (K2 - K1)

SOLVING FOR C , C = -K1 x A

EXAMPLE 1: WITH 3 mV APPLIED THE DMD-483-S2 OUTPUT

READS 4185 COUNTS.

WITH 30 mV APPLIED THE DMD-483-S2 OUTPUT

READS 41,745 COUNTS.

A)(41,745 x A) + C = 0.030 VOLTS

B)(4185 x A) + C = 0.003 VOLTS SOLVING EQUATION A - EQUATION B

(37,560 x A) = 0.027 VOLTS. THEREFORE

A = (0.027 ⎟ 37,560) = 7.1885 x 10-7= .00000071885

SOLVING FOR C, C = .003 - (K1 x A)

C = -8.38 x 10-6= .00000838

VERIFY YOUR RESULTS BY PLACING YOUR SOLUTIONS BACK INTO

EQUATIONS A AND B:

A)(41,745 x .00000071885) - .00000838 = 0.030 VOLTS

B)(4185 x .00000071885) - .00000838 = 0.003 VOLTS

IN A WEIGHING APPLICATION USING A LOAD CELL WITH A SENSITIVITY OF 3mV/V,

THE CONSTANT C WOULD THEN CORRESPOND TO THE TARE WEIGHT OF THE

SYSTEM.

EXAMPLE 2: WITH THE TARE WEIGHT ONLY APPLIED, READ 1,500 COUNTS.

WITH A FULL LOAD OF 100 POUNDS APPLIED, READ ABOUT 41,745 COUNTS.

A)(41,745 x A) + C = 100 POUNDS

B)(1,500 x A) + C = 0 POUNDS

One Omega Drive, P.O. Box 4047

Stamford, CT 06907

http://www.omega.com

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