Taking the difference of the above expressions yields 



C, - Cj = mj (0, - 02> ^3) 



where C, is the positive calibration voltage 

 Cj is the negative calibration voltage 

 d^ is the pitch angle represented by C, 

 ^2 is the pitch angle represented by Cj 

 ZC is the output voltage for = 

 nij is the slope of electrical-calibration sequence curve 



Since the associated curves were made to be identical, nij = nij. Therefore, solving for 

 m, and m2 in Equations (2) and (3), respectively, and equating the results yields 



D - ZC ^1-^2 



6 -(0, 



D - ZC 



(4) 



Since C, and C2 are fixed voltages, it follows that 9, and 6^ represent fixed angles, and 

 their algebraic difference represents a fixed number of degrees. 

 Letting d^ - 6^ = K yields 



K (D - ZC) 



(5) 



where K represents a constant number of degrees. 



If the physical calibration and electrical-calibration data are computer processed, the 

 value of K in degrees is determined simply by algebraic subtraction of 6^ and d^- To deter- 

 mine the value of K from a graphic calibration curve as in Figure 10, Equation (5) may be 

 used and solving for K 



28 



