Abstract: A device for determining the state of charge in batteries. The battery un test is discharged to its maximum capability by controlling the discharge current in a linear manner. The product of the current and battery voltage is recorded until the battery power reaches maximum at the maximum power point. The readings, peak power and the potential of the battery at the peak power, are held on meters by peak read and hold and track and hold circuits, respectively. From the readings obtained the state of charge can be determined by using a calibration curve for the type of battery being tested.

Abstract: Disclosed is a technique for testing functional circuit units of an integrated circuit. For each separate functional circuit unit desired to be tested, a capacitor is connected to each input while a diode is connected to each output. An electron beam then selectively renders first the selected capacitors conductive, permitting the application of a desired input pattern, and then the selected diode is rendered conductive in the reverse direction, permitting sensing.

Abstract: A nuclear magnetic resonance Fourier transform spectrometer includes a pulse modulated rf transmitter for delivering a train of radio frequency pulses having a pulse width pulse repetition rate to generate Fourier side bands to cover the spectral lines of the sample to be analyzed for exciting resonance of different resonance lines, if any, within the sample. Resonance of the sample is scanned in between successive transmitted pulses to obtain a multiplicity of successive time displaced components which are sampled and stored in a multiplicity of memory channels of a computer for time averaging thereof. The time averaged signal components are periodically read out and Fourier transformed to obtain a time averaged spectrum of the sample under analysis.

Abstract: Method and apparatus for measuring the repetition rate of a series of electrical input pulses. An electrical quantity having a predetermined initial value changes at a predetermined rate in response to the presence of an input pulse; a later value of the quantity is detected in response to the presence of the next input pulse; and, in response to the later value of the quantity, an electrical output signal is provided that is indicative of the repetition rate of the input pulses. Typically the steps are repeated for a plurality of successive input pulses and a control signal maintains the detected later values of the quantity substantially equal to a predetermined comparison value. An alarm may be provided in response to any substantial change in the repetition rate of the input pulses.

Abstract: The nuclear resonance signal obtained from the sample is stored in a memory circuit and the stored signal is then repeatedly read out. A periodic function which is derived as a result of the transformation of a triangular wave into a trapezoidal one, is used for the Fourier transformation of the repeatedly read-out signal. The adverse influence of the transient phenomenon in the h-f impulse signal on the resultant spectrum is eliminated by stopping the Fourier transformation only during the initial portion of the read-out period of the memory circuit.

Abstract: A signal to be controlled is applied to the base of an emitter-follower input transistor, the emitter of which is connected to an input terminal of a differential amplifier. This input terminal of the amplifier is connected by a diode to a controllable current source so that the base current of the differential amplifier input transistor is controlled. A constant current source is connected to the common emitter circuit of the differential amplifier, and the gain of the circuit is determined by the ratio of current in the latter source to current in the controllable source.

Abstract: In an alternating current electric power system subject to rapid load voltage regulation as a result of variations in reactive load current, reactive load current compensation is provided by fixed capacitors and inductors in parallel with the load, the inductors being in series with static switches which are phase controlled to continuously maintain the net reactive compensating current substantially equal and opposite to the reactive component of load current. Compensation control determines firing time of the static switches in accordance with the magnitude of reactive load current and regulating means additionally controls firing time to maintain line current and voltage at a selected line location substantially in phase coincidence.

Abstract: A fixture for testing flatpack modules which has a base section having a recess defined therein dimensioned and configured for engagement with the body of a flatpack module. A plurality of first connectors is disposed in a single plane on at least two sides of the recess. A second section having a generally inverted "U-shaped" cross section, the depending leg portions thereof disposed in generally parallel relationship and spaced a distance substantially equal to the distance between the sides of the recess having contacts disposed adjacent thereto. Electrically conducting members are disposed within the second section and are positioned for engagement with the module. A third section is provided having contact in electrical communication with the conductive members of the second section.

Abstract: An installation for the detection and, respectively, processing of electrical signals, in particular, physiological measuring signals, for example EKG, through the intermediary of a filter arrangement located in the measuring signal channel which is determinative of desired frequency components of the signals.

Abstract: A flash tube modulator circuit having a high peak power output at a high etition rate (50 KC) with variable pulse widths by employing resonant charging and discharging to ionize the gas in a flash tube followed by a high current pulse to produce a high peak power output.

Abstract: A particle analyzer of the Coulter type has at least first and second sensing zone arrangements, each having substantially the same dimensions and each generating a train of particle pulses in response to passage through the respective sensing zone of a sample containing a plurality of particles to be counted. A summing circuit connected to the output of each sensing zone sums together each of the trains of particle pulses to develop a summed train of pulses. Additional circuitry is connected to each sensing zone and the summing circuitry. This circuitry is operative to change mathematically at least the number of particle pulses in the summed train of particle pulses. The mathematically changed summed train of pulses and the train of pulses from the first and second sensing zones then are accumulated to produce an error corrected particle pulse count.

Abstract: Methods of driving a light-emitting diode (LED) or an injection diode at very high digital data rates using high speed emitter coupled logic (ECL) gates.

Abstract: The invention concerns a firing device for a number of electric valves, particularly thyristors. Each thyristor control path is associated with a firing circuit with a detector for electromagnetic radiation responsive to a transmitter which is controlled by a firing control signal and is equipped with a radiating device which energizes the individual detectors. To transmit the firing control signal with sufficient strength, a transmitter with a radiator is provided which is arranged in the focal line of a reflector designed as a partial elliptical cylinder. The individual detectors are disposed in a line which is aligned essentially parallel to the focal line of the reflector.

Abstract: A thyristor including a semiconductor element which comprises a main thyristor and at least one auxiliary arrangement operative to amplify the control current, the main thyristor having a main emitter and the auxiliary arrangement having an auxiliary emitter, a base being common to both the main thyristor and the auxiliary arrangement, and pn-junctions disposed between the base and respective emitters, emitter electrodes being disposed upon the respective emitters, and a control electrode connected to the base, in which the edge length (1.sub.E) of the respective emitters is such that the current is i.sub.e > i.sub.u (i.sub.e1 22 i.sub.u1, i.sub.e2 > i.sub.u2 etc.), where i.sub.e is, in each case, the product of emitter length (1.sub.E) and a line current density j.sub.e of between 0.3 and 1.0 A/mm edge length and the current i.sub.

Abstract: A bar graph display panel comprises a gas-filled envelope containing a series of fine, closely-spaced cathode lines connected in groups so that they can be energized sequentially and individually. The panel also includes an anode film supported on the face plate and aligned with and in operative relation with the series of cathode lines. The anode and cathodes are closely spaced and the panel contains an ionizable gas at relatively high pressure.In order to use the display panel to display a bar of light, the anode and cathodes are connected in an operating circuit wherein each of the cathodes is energized or scanned and caused to glow sequentially. An analog signal to be displayed as a bar of light and a ramp signal are coupled to a comparator, the output of which energizes the anode electrode.

Abstract: A device for reflecting radiant energy comprises a housing having two substantially mirror-symmetrical housing sections, each being provided with a curved supporting surface. The two housing sections are connected to one another so that the supporting surfaces face one another defining a concave cavity in the housing, the cavity being open toward the exterior of the housing. A reflecting element is situated in the cavity and supported on the supporting surfaces in substantial conformity therewith, the marginal portions thereof being received into recesses adjacent to the open side of the cavity. The housing may be elongated and the generatrices of the supporting surfaces may extend in parallel to the axis of the housing, and an elongated source of radiant energy may be accommodated in the cavity and extend parallel to the axis of the housing. A cooling system may be arranged between the housing sections or within the same so as to cool the supporting surfaces thereof.

Abstract: The resistance of a conductive film coating on the interior bulb wall of a fluorescent lamp is measured by capacitive coupling from the exterior bulb wall. A pair of metal bands engage the exterior bulb wall, with one band being connected to ground through a sensing resistor and the other band being connected through a series inductance to a variable frequency signal generator. The sinusoidal voltage output of the generator is set to a fixed frequency equal to or less than 15 KHz, and the series inductance is selected to provide a resonant circuit during lamp testing. The voltage across the sensing resistor is measured and compared with a predetermined reference voltage or a measurement of the generator output voltage to provide an indication of the internal film resistance of the tested lamp.

Abstract: To determine whether a motor is operative, where visual inspection of rotation is impossible or difficult, the motor is energized by connection to an AC source for a short interval to bring the motor to running speed. After lapse of the short interval the AC source is disconnected and the motor coasts to a stop. An AC detector determines that AC power has been terminated and closes a switch to connect a voltage detector to a memory. The voltage detector amplifies a residual EMF field generated while the motor is acting as a generator due to the presence of a residual magnetic field produced in the rotor during prior energization. The detected voltage sets the memory which energizes a motor rotation indicator.

Abstract: An internal combustion engine spark plug including an outer metal shell, a central electrode and a side electrode extending from the shell toward the central electrode to form a spark gap is provided with an open element formed of rigid metal wire resistant to the spark plug ambient use conditions, the member surrounding the spark gap and being spaced from the spark gap a distance at least equal to the width of the spark gap. Among the forms of the wire member are a pair of U-shaped wire members each having at least one leg secured to the shell and a horizontal linear cross leg parallel to and coplanar with the side electrode, two pair of such members arranged in quadrative with the cross legs forward of the side electrode, the members may have thinner wire wrapped about its legs, and an element including a pair of laterally spaced L-shaped wire members with the vertical legs connected to the shell and an intermediate L-shaped member formed of twisted wire with a horizontal leg underlying the side electrode.

Abstract: A signal transmission gate is disclosed for gating signals including those at af and rf frequencies in response to a gating signal. For the duration of the gating signal, the transmission gate has a low signal pass resistance. In the absence of a gating signal, the transmission gate has a high signal pass resistance. The transmission gate is bidirectional in that it can pass or block signals in two directions. The transmission gate is especially well-adapted for use in applications requiring a high signal shunt resistance when the transmission gate is on which is achieved by gating with a high impedance source. An embodiment of one such high impedance source is also disclosed.