Abstract: There is provided according to the invention an apparatus for the performance of photometric assays comprising: 1. A housing; 2. A plurality of translucent capillaries each being sealed at one end; 3. Means to provide each capillary with photonic isolation from a neighbouring capillary; and 4. Optical instrumentation and circuitry adapted to read an optical response or event in each capillary.

Abstract: A glitch detector and trap circuit is disclosed for removing a glitch generated by a digital-to-analog (D/A) converter due to an error in one or more bits of the input digital signal. The analog output signal is delayed by one sample period. The converter output signal is then subtracted from the delayed converter output signal. This difference signal is passed through a full-wave precision rectifier. Thereafter, the notified signal is clipped at a predetermined trigger level so that a glitch will cause an output pulse. The output pulse caused by a glitch is used to operate a monostable circuit. The monostable circuit in turn, is utilized to change a track and store amplifier from its track mode to the store mode. In this manner, the track and store amplifier will not pass the glitch, but will remain at its previous setting. A rise-time delay circuit is interposed ahead of the track and store amplifier so that it will not respond instantaneously to the next sample pulse before its store mode is initiated.

Abstract: In a hydraulic actuator such as those used in multiple degree freedom motion bases for aircraft simulators, a secondary force sensitive hydraulic servo loop is added in parallel to the primary position feedback servo loop with the secondary loop having a servo valve possessing substantially greater band pass and less capacity than the main valve used in the first servo loop. Force feedback from the control actuator is applied degeneratively to the smaller servo valve, thereby reducing noise and jitter caused by responses of the system outside the response of the primary servo loop. The response of the main servo loop which control the position of the actuator is low pass and restricts response to the full desired band pass of operational frequencies. The secondary loop is high pass and is shaped to prevent degeneration of operational frequencies while providing optimum gain and phase for the degeneration of the unwanted high frequency portion of the band wherein noise and jitter reside.