A digital timer for monitoring flow time through an orifice of a fluid sample having particles suspended therein. The digital timer includes means for presetting a sample flow time and means for providing an alarm when the flow time is greater than the preset time. The timer further includes means for automatically providing a validating signal to indicate that the apparatus has functioned properly and means for measuring digitally the preset time calibration.

A system controller 115 has a function of changing the position and the orientation of character data to be superimposed on the image data, in accordance with the operation of one of orientation keys. Specifically, when a downward key has been pushed, the character data is superimposed on a lower portion of the image data, not revolved and but oriented upward. When a rightward key has been pushed, the character data is revolved counterclockwise through 90 degrees, and is located along the right-...

Hardware registers which are addressed in the same manner as the main core memory and exchange data with external devices. The computer has no dedicated registers used as the accumulator, program counter and program counter save. Rather, addressed registers in the main core memory are used for these functions. Preferably, there are a plurality of each group comprising a dedicated computational machine. The computational machine which is being operated is specified by a dedicated machine pointer ...

A threshold accelerator switch is mounted on an object to indicate when the object is being subjected to a predetermined acceleration. The emitter and base terminals of a transistor are connected across the switch contacts. When the object is subjected to a predetermined acceleration, the switch contacts close causing the base electrode of the transistor to be shorted out, thus turning off the transistor. A plurality of switches and transistors can be mounted on a single object in order to measu...

Disclosed is a digital pickup for counting gear teeth and the like down to zero speed. A pair of magneto-resistors mounted on a permanent magnet sense the gear teeth. The magneto-resistors are connected in a bridge circuit and the bridge output triggers an integrated circuit switch incorporated in the pickup to produce a high voltage, low impedance digital output particularly suited for TTL logic.

A method and apparatus for measuring temperature within a preselected range of temperatures wherein the temperature is measured electronically and displayed digitally. A first electrical signal having a variable time duration proportional to the temperature being measured is compared with a second electrical signal having a preselected constant time duration indicative of the temperature comprising one end of the preselected range of temperatures. Counting, determining and display components of ...

A digital filter is used to provide a distinctive output signal whenever the frequency of an input signal deviates more than a predetermined amount from a nominal value. The input signals are applied to a digital counter through a coincidence gate which is enabled for precisely timed measurement intervals by means of timing pulses derived from a clock source. Signals are taken from those counter stages having a combined binary value equal to the lowest acceptable frequency and applied to a first...

A digital counter providing indication of the results of the counting, including a multicolumn counter with indicators having like digital electrodes which are combined and controlled by a reference pulse generator with ten outputs, such as with a decimal counter. Each decimal column of the displayed counter includes its own converter for a binary decimal code into a pulse position code whose output is connected through an amplifier to a common electrode, such as the anode of the digital indicat...

The digital amniotome described herein is a split-ring like device adapted to be placed on a finger for rupturing the amniotic membrane during obstetrical procedures. The ring-lke device has a recessed portion which is normally positioned to be located at the pad of the fingertip and has a sharp tipped element thereon. Immediately contiguous to the recessed portion is a guard portion which extends out beyond the recessed portion to prevent the sharp tipped element from contacting the amniotic me...

Attenuation is performed directly on a compressed PCM code by means of a circuit which treats the characteristic bits and the mantissa bits in accordance with an attenuation algorithm. The characteristic bits are applied to a counter circuit whose output is used to produce a first term of the algorithm and the mantissa bits are applied to a shift register whose output is used to generate a second term of the algorithm. The two terms are added together and used to generate the characteristic bits...