Abstract: The present invention discloses a method for obtaining frequency parameters to determine the resonator inductances of a crystal. Under this method, a plurality of frequencies are applied to a first electrode. This application is performed once while the second electrode and the common electrode are connected by a short circuit, and then again when the second electrode and the common electrode are capactively connected or open circuited. During each application of the plurality of frequencies to the crystal, the phase response for the output of the resonator circuit is monitored. Then the time response of the crystal is determined. Next, the time delay relative maxima for the time response is determined. Finally, the frequencies at which the time delay relative maxima occur are determined. These frequencies correspond to the inflection points where the change in phase goes from monotonically increasing to monotonically decreasing.

Abstract: A fluid flow assembly controls fluids passing through a secondary or communication line of a manifold. The manifold includes at least one output port connected in fluid communication with the secondary line. A fluid supply is connected to a fill valve controlled by an electronic feedback control. An exhaust valve is also controlled by the electronic feedback control. Together, the fill and exhaust valves regulate the pressure of the fluid flow through the secondary line and the valves associated with each of the output ports.

Abstract: A pilot signal control assembly (10) controls the pilot signal of a valve (18) which is connected to regulator, typically a booster regulator (12). The valve (18) receives air from an air supply (14) and, pursuant to an error signal (E(t)) , defined as the command signal (C(t)) less a modified feedback signal (F(t)) , modifies its output, the pilot pressure signal. The booster regulator (12) receives the pilot pressure signal and modifies its output (P.sub.o (t)) accordingly. A feedback loop (24) transforms the output pressure (P.sub.o (t)) into a voltage signal. The voltage signal is multiplied by a proportional factor (A) based on the size of the booster regulator (12). In a signal subloop (30) of the feedback loop (24), the first derivative is taken of the voltage signal. The multiplied signal and the first derivative are added to create the feedback signal (F(t)) which is eventually subtracted from the command signal (C(t)) to create the error signal (E(t)).

Abstract: A valve assembly controls a pressure sent from a valve to create a pilot signal used to control a mechanical booster regulator. An independent feedback line extends from both the output of the valve and the output of the mechanical booster regulator wherein the outputs are scaled after a transducer in each feedback line converts the information received from the pressures into voltages. The difference in the voltage is integrated and added to the input command signal which dictates the parameters of the mechanical booster regulator operation. The voltage feedback from the pilot pressure is then subtracted from the modified command signal. The feedback signals approach a negligible correction as the mechanical booster regulator approaches the designed output pressure because the integration is eliminated and the pressures cancel each other as the system approaches a static condition.

Abstract: A solenoid having a bobbin with a rectangular core hole in which is mounted an armature having a rectangular cross section, and a pole piece having a rectangular cross section. The bobbin has a magnet wire coil wound around a bobbin tubular body which is rectangular in cross section. The bobbin has an upper flange and a lower flange that encloses the ends of the coil. A tubular can is seated around the bobbin. A top flux plate is seated on the upper can surface and a bottom flux plate is seated under the lower can surface. The flux plates are secured to the bobbin flanges. A sealing, electrical insulating heat dissipating material is disposed inside of the tubular can which seals the coil and insulates the coil from the flux plates, tubular can and solenoid mounting screws.