This invention is a testing device for a transmitting/receiving system for detecting movement due, for example, to an intruder or a fire, and is arranged to be automatically operated when the main system is switched on to perform a test that the transmitter and receiver are operating correctly by applying a test signal to be transmitted and by detecting whether the test signal is received at a distant location and also by testing that the test signal applied directly to the receiver gives an ala...

The solderability of plated through holes in a printed circuit board is treated by applying solder to one end of the hole and measuring the time it takes to travel through the hole. This time is a measure of solderability -- the shorter the time, the better the solderability. Apparatus for carrying out the method comprises a work platform 11 for holding the board 20; a probe 22 for centering a hole in the board and then forming a contact at the end of the hole, level with the upper surface of th...

A system is disclosed for testing a plurality of items of test data, the system comprising memory means for storing a plurality of items of stored data and, in response to an input signal identifying one of the items of stored data, producing an output signal dependent on that item of stored data. The input signal is dependent on one of the items of test data and on a feedback signal comprising at least part of the output signal produced on testing a previous item of test data, at least part of ...

A testing device that tests an electronic device includes a detection-voltage outputting unit operable to output a current detection voltage based on a power source current that the electronic device receives from a power source, a transmission line operable to transmit the current detection voltage, a detection amplifier operable to output an amplifier output voltage based on the current detection voltage received through the transmission line, a switching unit operable to select whether the cu...

An apparatus for leak testing a garment, such as an over-water flying suit formed of a waterproof material, comprises a closure plug (4) for closing the neck of the garment and clamps (36, 38, 40, 42) for holding it in place. Clamps (26, 28) close other openings in the garment to allow it to be inflated, usually turned inside out to simulate exposure to water immersion. A mixture of water and compressed air is sprayed into the inflated garment via nozzles (18). The inflated garment is then inspe...

Method and apparatus for testing an implant attached to a bone of a human or animal subject includes a member releasably attached to the implant. The member carries a transducer for exciting the member with a variable frequency AC signal, and a transducer for detecting a resonance frequency of the member. The detected resonance frequency is used to assess the degree of attachment of the implant to the bone.

Packages (7) are conveyed through at least one, and preferably two, test stations (14, 16). At each station there is a test head (7) which is urged towards the conveying path, preferably by gravity. As a package (7) is conveyed through a station it displaces the head away from the path. The displacement is monitored. Preferably, subsequent displacement towards the path due to leakage of the package is also monitored.

A testing board for testing the electric characteristics of semiconductor integrated circuit elements by applying a voltage to each of the testing electrodes of the semiconductor integrated circuit elements comprises a wiring board having a wiring layer at the surface thereof opposing the semiconductor integrated circuit elements. An elastic sheet is disposed in spaced relation to the opposing surface of the wiring board. Probe terminals are disposed on the surface of the elastic sheet opposing ...

A testing apparatus for testing a depth of a server chassis includes a testing frame configured for being received and secured in the server chassis, a testing unit, a signal processing member and an indicating member. The test unit includes a testing pole telescopingly retained in a rear wall of the frame, a pair of first and second contacting members spaced apart with a distance in accordance with the desired depth range, and a trigger member secured to the testing pole and moving with the tes...

A method of monitoring the surface of a sample under test is provided and the method comprises the steps of: illuminating the surface with light (20) polarised in a first direction; viewing light reflected from the surface through a polarising filter (27) arranged at 90.degree. to the first direction, wherein the surface of the sample under test is provided with a marked area where diffuse reflection of the incident polarised light will occur in order to improve the contrast between the marked a...