I am trying to calibrate this circuit, and it is hooked up to a voltmeter and also a power supply. When the circuit is horizontal, the voltmeter is supposed to read zero both in the x and y direction. Here, the x-direction is determined by tilting the circuit up and down and the y-direction is determined by tilting the circuit left and right (or something like that). Anyway, when I put the circuit on the leveled surface however, the voltmeter doesn't read zero for both x and y values. Therefore, in order for the voltage reading to read zero, I have sort of adjust the length of the four sides of the circuit so that the voltage is zero when it is on a leveled surface. The circuit came with a calibration curve fit equation theta = a + bV +cV**2+dV**3+eV**4+fV**5 where V is the X or Y output and a,b,c,d,e,f is given for both the x-axis and the y-axis. I calculated the angles using the voltage values I found when the circuit was leveled on the surface. The voltage when the circuit is horizontal is 0.1999 arc degrees for the x-axis and -1.023 arc degrees for the y-axis. Using these values, I have to determine a correction factor for the four sides of the circuit, so I can make four stands to make the voltage zero when it's on a leveled surface. I'd appreciate if someone could give me some input on how I should do this. I know I have to use the angles I calculated somehow.