Abstract: Electrical continuimeter device for checking the electrical continuity of a conducting layer covering a structure having conducting and non-conducting parts, said conducting layer being covered by an insulator layer. The device comprises a pick-up with an inner and an outer coaxial electrodes to be put on the insulator layer. A supply alternating voltage is applied between the inner electrode and the ground terminal of the structure developing a first voltage across a load resistor and a second voltage between the outer electrode and the ground terminal is measured. Components of the second voltage respectively cophasal and in phase quadrature with the first voltage are generated and these components are divided by the first voltage, thus providing the resistive and reactive components of the ground impedance.

Abstract: A flat coil velocity transducer includes a thin, flat coil mounted to a member whose velocity is to be measured. The convolutions of the coil are skewed so that regions at opposite ends of the coil contain predominantly upper or lower legs of the convolutions. The coil moves transverse to a magnetic field to induce voltage in the legs of the coil. However, the field induces voltage in one, but not the other, end region so that a resultant voltage is induced in the coil dependent on the strength and direction of the magnetic field, the number and length of the legs in the region, and the direction and velocity of movement.

Abstract: A novel digitized measuring system is disclosed for the measurement of the DC parameters of a wide variety of electrical and electronic devices. A stimulus measuring unit (SMU) is disclosed which can alternatively act as a voltage source and current monitor or as a current source and voltage monitor. A device under test (DUT) can be characterized without changing external connections and the resulting data can be manipulated and displayed in a wide variety of graphical or tabular forms.

Abstract: The present invention relates to a method and a device for measuring and displaying the frequency response of a test object (1), such as an amplifier, tape recorder, whereby a known test signal (S) is transferred to the input of the test object (1) while the transmitted signal (U) is measured at the output of the test object, whereafter the measured frequency is displayed on a display means (2). According to the invention, the test signal (S) is comprised of a sine pulse train of different partial signals (D1, D2, D3, D4) with predetermined frequencies and with the same amplitudes. The different partial signals are detected at the output of the test object (1) by a completely independent detector unit (3) which continuously, within a whole or half period of the signal, reads the amplitude as well as the frequency.

Abstract: A microwave probe for measuring the amount of soot or water in engine crankcase oil and/or detecting the level of oil comprises a coaxial cable having a tip including five substantially parallel wires shorted together at one end and connected at the other end to the coaxial cable, one of the wires being connected to the center wire of the coaxial cable and the other four wires being connected to the sheath of the coaxial cable. The size and geometry of the wires is selected so that the impedance of the tip when immersed in oil substantially matches the impedance of the coaxial cable.

Abstract: The present invention relates to devices for the quality control of the electrical insulation of printed circuits made in particular in multiple layers superposed on insulating supports of laminar structure by means of conventional or hybrid technologies. To this end, the testing device according to the invention essentially comprises: a specific sensor circuit constituted by a supple insulating screen comprising a plurality of conducting studs with one and only one stud for each conductive printed circuit path; a scanning circuit associated with said sensor circuit comprising a metallized insulating layer having at least two coplanar conducting zones insulated by at least one transverse electrical discontinuity; a measuring apparatus indicative of the galvanic insulation existing between two contiguous conducting zones of said scanning circuit.

Abstract: A microwave probe for measuring the amount of soot or water in engine crankcase oil and/or detecting the level of oil comprises a coaxial cable having a tip including five substantially parallel wires shorted together at one end and connected at the other end to the coaxial cable, one of the wires being connected to the center wire of the coaxial cable and the other four wires being connected to the sheath of the coaxial cable. The size and geometry of the wires is selected so that the impedance of the tip when immersed in oil substantially matches the impedance of the coaxial cable.

Abstract: A test terminal for a lightning arrestor in an electric power transmission system is formed of a unitary generally cylindrical ceramic element having metallic end caps secured thereto. A bar-shaped electrical bypass conductor is removably secured to the end caps. An electrically conductive glaze is applied to the external surface of the ceramic element along a band between the end caps, and spaced apart therefrom. The electrically conductive glaze serves as a guard electrode for attachment thereto of a clamp of a test lead. The cross-sectional area of the conductor is less than approximately 5% of the mean cross-sectional area of the ceramic element.

Abstract: The location of a leak in a pond liner made of a sheet of electrically insulating material, such a polyvinyl chloride, supported by an electrically conductive medium, an example of which is a salar, is determined by immersing a power electrode in an electrically conductive fluid within the pond and a second or ground electrode in the supporting medium and creating therewith an electric potential between the pond fluid and supporting medium. A detector, having a pair of spaced probe electrodes which are electrically connected, is introduced to the fluid near the power electrode with the ends of the probe electrodes adjacent the liner. The detector is rotated until a maximum current reading is obtained by a galvanometer electrically connected to the detector probes. With the probes so aligned with respect to the power electrode, the probes are cause to traverse the liner and the location of a leak is noted by a sharp change in the galvanometer reading as one of the probes passes over the leak.

Abstract: The device comprises a scale (1) and a slide (2) which are provided with electrodes arranged to form two pairs of capacitances for the measurement of the displacement of the slide on the scale (CA.sub.1 -CA.sub.2, CB.sub.1 -CB.sub.2). These measurement capacitances are connected to an electronic feed and processing circuit (3) in which they are connected in a bridge (4A, 4B) with switched reference capacitances of MOS type. In this circuit, the outputs of these bridges are connected via comparators (5A, 5B) to a processor (6) of CMOS type adapted to produce a terminal digital measurement signal by counting the periods of the signal of the measurement capacitances and by numerical interpolation within each of these periods. This interpolation is effected by balancing the capacitive bridges by means of a digital algorithm.

Abstract: A biased reactor maintenance termination unit (30) is described that comprises a saturable core reactor (31), a permanent magnet (90) and a termination network (16). The saturable core reactor (31) is connected in series with conductors (11, 13) of a transmission line. The permanent magnet (90) is placed adjacent to the reactor (31) to create a bias mmf. Finally, the termination network (16) is connected across the transmission line conductors (19,21).

Abstract: A method and apparatus for detecting discontinuities in electric conductor heating lines in automobile heated back lights is disclosed. The apparatus includes a "Hall effect" probe, a microprocessor, a display, a stepping motor drive, an optical scanner and associated circuitry. The method includes the steps of energizing the heating grid and moving a Hall effect probe in the vicinity of each conductor line. Any heater line having discontinuity will lack a detectable magnetic field.

Abstract: Inductive coupling of a high-frequency signal into a cable to be detected d tracked in a seawater medium for sensing the relative position of the cable with respect to capacitor plates. The capacitor plates are positioned so that in conjunction with the cable a differential capacitor is formed. Relative movement of the capacitor plates with respect to the position of the cable is used to unbalance a Wheatstone Bridge circuit. The output signal from the bridge circuit is proportional to their displacement and is used to provide a guidance signal to realign the capacitor plates and the cable.

Abstract: An electronic fuel injection system tester performs a plurality of system integrity tests on individual components and sensors of the system. The tester is plug compatible with the various wiring harness and connectors of the fuel injection system to permit a plurality of integrity tests to be performed either simultaneously or in rapid succession. The tester may be used to test a wide variety of fuel injection systems found in many popular vehicles by virtue of a multiple purpose electronic circuit and front panel template overlays corresponding to each make of vehicle or type of fuel injection system.

Abstract: A circuit tester for automotive electrical systems comprising a body member of "pistol-grip" configuration having an electrical socket at one end thereof and an electrically conductive probe extending from the other end thereof. An electrical lead is provided for connecting the terminals of the automobile battery to the socket. The lead has a plug at one end thereof which is reversibly receivable by the socket to enable the tester to be placed in either a positive test mode or a negative test mode. A first electrical lead member extends through the body member from the socket to the probe and has a light imposed therein. A second electrical lead extends from the socket to the probe but has a normally open, manually operated switch imposed therein. The second electrical lead member also has a replaceable fuse assembly imposed therein. The light will be illuminated when the switch is closed whether or not the probe is in electrical contact with the electrical system of the automobile or a component thereof.

Abstract: An apparatus for determining the operating condition of capacitors of the type used for power factor correction on electric distribution systems is assembled in two sections. A first power supply device supplies an alternating electric current to a de-energized capacitor without removing it from its installed position and a second power measurement device, utilizing either a split-core Hall-device or a special distributed winding, measures the magnitude of the electric current entering the capacitor being tested.

Abstract: A moisture sensor including in one embodiment a probe formed with a first cylindrical tube extending outward from a base and having a plurality of axially extending slots around the periphery thereof and a second slotted cylindrical tube extending outward from the base separated and insulated from the first tube, and extending coaxially with the first tube. The tubes form an effective coaxial capacitor and are insertable into material to be sensed appear as a ground plane. In a second and third embodiment a member defining flat surfaces extends from a base forming in cross-section a volume with a square center and legs extending from each side thereof to an open peripheral end. An RC bridge circuit, preferably a Wien bridge or a capacitor divider circuit is connected to the tubes to measure the impedance of the material.

Abstract: A time domain reflectometer apparatus for testing a cable and for cooperation with an oscilloscope or other display apparatus which includes structure for generating a first plurality of pulses which are positive going and for generating a second plurality of pulses which are negative going and which are each synchronized with one of the positive going pulses. The apparatus also includes structure for applying at least one of the pluralities of pulses to a cable to be tested, for cooperating with the associated display apparatus, for providing a display of at least reflective pulses from the cable being tested and for bucking the positive going pulses with the negative going pulses to minimize the amplitude displayed of the pulses being supplied to the cable being tested.

Abstract: A cable failure detection system is provided that detects changes in the magnetic field of a cable that has been magnetized said changes in the magnetic field coming about due to a flaw in said cable. Said changes are sensed by a gauss meter which generates a signal, said signal being converted into a visual or audio signal for early warning of failure.

Abstract: A portable, battery-powered combination probe search test light, test lead, and continuity tester provides a selection of modes of use for illuminated and non-illuminated search and continuity indication, in a simple circuit; according to needs indicated by push-button switches, continuity of a circuit to be tested may be indicated by illumination; in a further mode continuity is indicated by illumination of a dimmer light; these modes provide for testing the lights individually; two flexible leads with clips and a novel housing-mounted pivotal probe in selective combination provide contacts for the versatile modes of testing and for charging the battery either, with or without, illumination indicating charging.