Abstract: Disclosed is a device for releasable connecting an interface with a load board for providing a mechanically pressing of the components against each other. The device comprises a toroidal lock, which is operated by at least one lever to transmit the lock from a releasing position to a locking position. This device enables a quick change of Load boards to the interface with a reproducible positioning. The load board may include extensions, such as rollers, that enter slot-like guides in the toroidal lock and that are to be retained in these guides when the lock is rotated to a locking position.

Abstract: Disclosed is a device for releasable connecting an interface with a load board for providing a mechanically pressing of the components against each other. The device comprises a toroidal lock, which is operated by at least one lever to transmit the lock from a releasing position to a locking position. This device enables a quick change of Load boards to the interface with a reproducible positioning.

Abstract: A device for calibrating a test head of a testing device, where the test head has multiple electric contacts which are positioned in a contact region, has a contacting unit, which is dockable on the test head such that the contacting unit covers the contact region of the test head. The contacting unit includes a contact head, which has at least one measuring contact for contacting the contacts of the test head and is multi-dimensionally movable within the contacting unit using a positioning unit such that the contact head may approach and contact at least multiple contacts of the contact region. The device also has a control unit, which operates the positioning unit in calibration operation such that multiple or all contacts of the contact region to be contacted for calibrating the test head are automatically approached and contacted by the contacting head.

Abstract: A device for calibrating a test head of a testing device, where the test head has multiple electric contacts which are positioned in a contact region, has a contacting unit, which is dockable on the test head such that the contacting unit covers the contact region of the test head. The contacting unit includes a contact head, which has at least one measuring contact for contacting the contacts of the test head and is multi-dimensionally movable within the contacting unit using a positioning unit such that the contact head may approach and contact at least multiple contacts of the contact region. The device also has a control unit, which operates the positioning unit in calibration operation such that multiple or all contacts of the contact region to be contacted for calibrating the test head are automatically approached and contacted by the contacting head.

Abstract: Disclosed is a test head assembly for a test system, comprising a test head having a plurality of test head contact areas for providing electronic signals to one or more devices under test (DUT) and/or for receiving electronic signals therefrom. The test head assembly further comprises fastening means for fastening one or more individual, physically separated DUT boards to the test head, each DUT board being provided for holding one or more of the DUTs and adapting electrical contacts thereof to at least one of the plurality of test head contact areas. In order to provide a flexible and modular test head arrangement allowing an easy exchange of different DUT boards with different seizes, the arrangement of the fastening means and the plurality of test head contact areas is commensurable, so that one or more DUT boards with same and/or different lateral dimensions are attachable to the test head.

Abstract: UV hardenable lacquer, in particular for molded polycarbonate (PC) bodies, comprising:(A) 5 to 60%, referring to the total weight of 100% of the entire mixture, of an aliphatic polyurethane acrylate, preferably 5 to 20% of a hexa-functional PU acrylate;(B) 30 to 45%, referring to the total weight of 100% of the entire mixture, of a cross-linkable, polyfunctional acrylate having less than 20 C atoms in the molecule;(C) 0.01 to 3%, referring to the total weight of 100% of the entire mixture, of a cross-linkable polyfunctional silicon acrylate;(D) if required, between 1 and 5%, referring to the total weight of 100% of the entire mixture, of a monofunctional, ethylenically unsaturated compound such as N-vinyl pyrrolidone;(E) 0 to 70% referring to the total weight of 100% of the entire mixture, of organic solvents;(F) photo initiators; and(G) light protector.

Abstract: The invention is a multi-stage process for purifying hydrogen chloride containing acetylene and ethylene, from pyrolysis of 1,2-dichloroethane to provide highly pure hydrogen chloride for use in the preparation of silicon compounds. In the first stage, unsaturated by-products are chlorinated by reaction with an excess of chlorine gas. In the second stage, the unreacted chlorine gas remaining in the hydrogen chloride is reacted with an excess of defined olefins or chloroolefins and the hydrogen chloride is separated from the chlorination products and the excess olefins or chloroolefins by low-temperature rectification under pressure.

Abstract: In a process for the purification of hydrogen chloride from the pyrolysis of 1,2-dichloroethane, optionally after a preceding step of acetylene removal by selective hydrogenation under specific conditions followed by rectification of the resulting mixture to obtain hydrogen chloride containing at most 5 ppm of unsaturated hydrocarbons and at most 5 ppm of chlorinated hydrocarbons.

Abstract: In a process for preparation of 1,2-dichloroethane by chlorination of ethylene-containing reaction vent gases from the oxychlorination of ethylene in the presence of a catalyst carrier impregnated with metal compounds wherein the waste from the oxychlorination stage are chlorinated, the improvement comprising preheating the ethylene-containing waste gases to at least 50.degree. C. and then chlorinating the ethylene at 100.degree. to 300.degree. C. at a pressure of 1 to 7 bar with a space velocity of 100 to 5000 h.sup.-1 related to standard conditions in the presence of at least one metal compound selected from the group consisting of chlorides and oxides of manganese, nickel and cobalt supported on a catalyst carrier with reduced formation of oxychlorinated by-products.

Abstract: In a method of recovering heat from flue gas resulting from the combustion of chlorinated organic compounds at 900.degree. to 1300.degree. C. at a pressure of 0.9 to 1.5 bar absolute whereby the flue gas is cooled with the recovery of heat and hydrogen chloride is processed, the improvement comprising (a) cooling the flue gas in a first step to a temperature of 250.degree. to 350.degree. C. with a contact time of 0.05 to 0.15 seconds, (b) cooling the flue gas in a second step to a minimum of 140.degree. C. with a contact time of 1.3 to 2.0 seconds, the cooling medium in both stages being water flowing at an initial temperature of 100.degree. to 140.degree. C. in step (b) counter to the flue gas flow direction and added to cooling stage (a) at a temperature of 200.degree. to 220.degree. C. and (c) cooling the flue gas in a third stage to its dew point and scrubbing it with water to recover the hydrogen chloride therein in solution.

Abstract: A method and apparatus for the four-wire type transmission of digital message signals between a superordinate system, such as a digital exchange, and a subordinate system, such as a digital subscriber station, along a two-wire transmission line. A regenerator is inserted at a given point in the transmission line which switches the message signal blocks repeatedly and alternately transmitted between the superordinate system and the subordinate system onto a four-wire line within the regenerator. The message signal blocks transmitted from the subordinate system to the superordinate system are separately delayed within the regenerator by a delay time period sufficient to avoid overlap with the time periods during which the message signal blocks transmitted by the superordinate system are received at the regenerator.

Abstract: A circuit arrangement is disclosed for individual subscribers in a telecommunication set up. The circuit arrangement converts analog signals into digital signals and digital signals into analog signals. When operated in a conference connection, summation signals are received by a subscriber which contain the subscriber's own share. Output digital signals from the subscriber are stored and converted into an analog value and are then subtracted from the received summation signal converted into an analog value.

Abstract: A circuit arrangement is disclosed for converting digital signals into analog signals and analog signals into digital signals. The circuit arrangement is used as a conference set for use by individual subscribers on a multiplex line. Digital signals of all subscribers are consecutively converted into analog signals and an analog summation signal is formed therefrom. This summation signal is again converted back into a digital signal and can be multiply transmitted as such. Alternatively, a number n of circuit arrangements are provided for a maximum number n of subscribers. Each of the circuit arrangements converts digital signals of n-1 conference subscribers (excluding an allocated subscriber) into analog signals and forms an analog summation signal therefrom. This analog summation signal is converted back into a digital signal which is transmitted in a time slot allocated to the allocated conference subscriber to which the circuit arrangement is allocated.

Abstract: A method and apparatus for a telecommunication installation is disclosed for converting PAM analog signals into PCM digital signals and vice versa. A conversion circuit which is connected to a telephone station comprises an input register for temporarily storing the incoming PCM digital signals and an output register for temporarily storing the outgoing PCM digital signals. This conversion circuit includes a clock pulse generator which enables a counter to count through all its counter positions upon the appearance of each channel time slot pulse of the incoming PCM channel time slot pulse train. The input register and counter are connected to an intermediate register which in turn is connected to a digital-to-analog converter for converting the incoming PCM digital signal into an analog signal. This analog signal is sent to the receiving unit of the telephone station in a first time interval of the counter.