rest i e zero degree rotation to between 0 5 volts counterclockwise and 4 5 volts clockwise u00b1 60 mv at a maximum rotational rate of 90 degrees per second the output being linear from rest to maximum rotational rate terminal t3 is the second output terminal providing a steady 2 5 volt reference signal to the level shifter 50 terminal t4 is a diagnostic output not used and t5 is circuit common the operating outputs from gyrostar u2122 piezoelectric sensor 40 terminals t2 and t3 are fed to angle integration logic circuitry 30 and more particularly to level shifter 50 which consists of resistors r1 r4 and instrumentation amplifiers ic1 terminal t2 is connected to one end of resistor r2 while terminal t3 is connected to one end of resistor r1 the other ends of resistors r1 and r2 are connected directly to the inputs of amplifier ic1 amplifier ic1 is used in differential mode to shift the output of gyrostar u2122 piezoelectric sensor 40 to circuit common zero volts resistors r1 through r4 establish a gain of one at the output of level shifter 50 the output of level shifter 50 is then applied to a 10k u03c9 potentiometer r5 which is used to adjust the input gain of voltage to frequency converter ic2 via resistor r6 and capacitor c1 in a constructional.