A test probe having only two substantially rigid electrically conducting members which are insulated from each other, these members terminating in respective contact portions. When the probe is in use, these two contact portions simultaneously contact spaced apart areas of a current conducting segment then being tested. An insulated handle is formed by a protecting layer of insulation coupled to the two conducting members; and a pair of conducting leads pass through the handle and are electrical...

A test stand (10) having a principal use for testing a fuel pump and associated governor (24), has a drive shaft (16), an inertial weight (30) operatively associated therewith, and apparatus (56) for selectively engaging and disengaging the inertial weight (30) with the drive shaft (16). This test stand (10) solves the technical problems associated with present test stands, which problems include the inability to maintain a constant drive shaft speed for fuel pump calibration, and also the inabi...

A test facility comprises a transmitter and a receiver for an automatic test system for function testing of integrated circuits of different technologies, whereby the input and output of the test specimen are connected to the same test pin. In order to test circuits of different technological format, it is necessary to pre-program the output of the test facility to the respective characteristic level of the different circuit families. To this end, a transmitter contains a constant current source...

In an in-circuit test fixture of the type including a bed of pins, first ends of which are adapted to contact a circuit board, means for supporting the pins, and means for making electrical connection thereto, there is disclosed an improvement wherein the pins are solid members and are freely slideable in the supporting means and wherein the test fixture includes a sheet of resilient material engaging second ends of all of the pins for providing the force necessary to urge the pins into contact ...

A digital concentrator system for use with a plurality of digital carrier systems in the telephone subscriber loop plant is disclosed. The concentrator system comprises a central office terminal (100), a remote terminal (102), and an interconnecting digital carrier path (108). In the transmit direction at each terminal (110,112), a plurality of multiplexed encoded signal streams are demultiplexed and the encoded signals stored. A selected number of encoded signals are retrieved and multiplexed f...

A test system for wells which may be utilized in any well having a landing nipple therein. A pressure recording instrument is run in on a locking mandrel and a closing tool is provided which cooperates with a valve and moves it from open to closed position. With the closing prong engaged with the valve member and the valve in open position a small diameter extension on the prong is positioned opposite the ports in the valve to provide a large flow area.

Test meters, particularly of the type employed for testing electrical circuits, e.g. multimeters, are improved in operational efficiency. In one aspect, remote selection of test and/or report format frees the operators hands for concentration on a test piece. In another test results or format information are conveyed as synthesized speech in any of a number of selectable formats. By combining both aspects in a hand-held multimeter, a high degree of interaction between the operator and the meter ...

A test device useful for the detection of a component of a fluid system comprises a water-resistant carrier, such as an organoplastic strip, containing, as an integral part thereof, a test system for the detection of such component. This test device is produced by incorporating the test system into at least a partially dissolved portion of the carrier material and then solidifying such carrier material with the test system included therein.

A test analyzer for use in a test-grading device, wherein in response to the sensing of answer indications in the corresponding answer indication areas of an answer sheet and an answer key, a binary comparison signal is provided by means of "exclusive or" logic for each answer indication area indicating whether the student's answer indication agrees or disagrees with the answer indication in the corresponding answer indication areas of the answer key. In a preferred embodiment, an OR logic circu...

There is disclosed a circuit including a gate-controlled switch for gating alternating current to a load. A timing circuit is employed to turn the switch on or off at a predetermined time after the line voltage reaches zero. The device of the invention is especially useful as a test circuit for applying a voltage or interrupting a current to a load at a predetermined time during the cycle of the line voltage. A zero point detector having a manually operable switch is employed to actuate the timi...