Patent GB-1012725-A (GB)
Title: Improvements in and relating to electrical testing apparatus
IPC: G01R31/26
Filed: 1962-04-03
Abstract: 1,012,725. Electric selective signalling. PHILCO CORPORATION. April 3, 1962 [April 3, 1961], No. 12705/62. Heading G4H. [Also in Divisions G1 and H2] Apparatus for component testing comprising means to register the information carried by a test record, such information relating both to coded identification of a component type to be tested and to the predetermined test conditions for that component type; means to receive a magazine of components to be tested, such magazine carrying contact coded information identifying the contained component type; means registering the coded information carried by the magazine, and means discriminating between the conditions of correspondence and of non-correspondence between the information carried by the record and that carried by the magazine. Fig. 1 shows apparatus 10 for testing multiple components, e.g. transistors wherein control buttons 22 regulate starting, stopping, and recycling of the equipment, indicator lamps 18 show the components being tested, and the resultant test data are monitored by readout digital voltmeter 24 and recorded by apparatus connected to output 28. The detailed cycle of tests for voltages and currents at the successive components utilizing circuits (not shown) is determined by a punched record card 26 inserted in a receiver 12, while a magazine 16 receiving a series of components (Fig. 3, not shown) is interlockable with socket 74. Record 26 (Fig. 4) is selectively punched at locations 32 in combinations denoting tests to be applied (e.g. voltages) and in columns or locations 34 to identify the particular record. The receiver 12 comprises base-plate 38 carrying plural SPS1 plunger switches 42, one per indicating location of the record, and a further plunger switch 44 detecting the presence of a record which is pressed on the plungers by a backplate 48 located by pins 54 and clamped at 58, so that the plungers protrude at a perforation or in the absence of a record and are otherwise held depressed. A series of components and transistors are inserted in a magazine 16 (Fig. 4) having their electrodes connected to respective groups of contacts 72, 74. Additional contact groups 78, 80 are provided for interlocking and control of the test equipment, and the contact groups are received by parallel slots 82, 84, 86, 88 of socket 14. In Fig. 2, magazine contact groups 78a, 78b, 78c are insulatedly mounted and are interconnected six at a time as bridging strips and selected contacts of each group are frangibly removable (Fig. 2A, not shown) leaving contacts, e.g. 102a, 102c, 102f; 104a, 104b, 104c; 106a, 106d, 106e representing three decimal digits of a serial number in a bi-quinary code. The contact groups mate with receiving groups of 6 contacts 94a to 94f, 96a to 96f; 98a to 98f, insulatedly mounted in the socket 14 and the magazine also carries a shock actuated normally closed switch 152 connected over contacts 78d, 78e and 144, 146 to open permanently if the magazine is jarred (Specification 985,675). Contacts 94a, 96a, 98a are connected to a gate potential source E and contacts 94b-94f are respectively connected to inputs of " and " coincidence gates 114a, 114b, 114c, 114d; 114a, 114e, 114f, 114g; 114b, 114e, 114h, 114i; 114c, 114f, 114h, 114j; 114d, 114g, 114i, 114j forming together a bi-quinary to decimal decoder network 116, with the gate outputs connected over a bank 124 of single pole switches 118a to 118j (shown in normal condition) to the ten inputs of an " or " buffer gate 122, whose output is connected to a three-input " and " coincidence gate 126, receiving inputs from similar arrangements 128, 130, 132 and 134, 136, 138 associated with contacts 96a to 96f and 98a to 98f respectively. The gate 126 may comprise (Fig. 2B, not shown) three transistors and a resistor in cascade across a potential source with inputs to the transistor bases and output across the resistor. The gates 114 may be similar, using two transistors, and the output of 126 is connected over normally open switch 142 to contact 144, and contact 146 is connected to a start relay 154. On plugging in magazine 16 and inserting record 26, plunger 44 is actuated to close switch 142 and since switch 152 is closed a potential appears on lead 148 which operates start relay 154 to initiate testing, by circuits (not described) according to a cycle established by punchings of record 26. Switches 118a-118f and 118h- 118j are held open and switch 118g is allowed to close by the record, while as shown contacts 102a, 102c, 102f energize one input of gates 114a, 114e, 114f, 114d, 114c and 114j and both inputs of gate 114g to supply a potential over switch 118g and the " or " gate 122 to one input of " and " gate 126. Similarly, contacts 104b, 104c energize both inputs of the " and " gate of network 128 corresponding to gate 114c in network 116. Closure of the corresponding switch in bank 130 energizes the second input of " and " gate 126 over " or " gate 132. Also similarly, the " and " gate of network 134 corresponding to gate 114h of network 116 energizes the third input of " and " gate 126 on closure of the switch in bank 136 corresponding to switch 118h of bank 124 and the third input of gate 126 is energized to develop an output signal, which since switches 142, 152 are closed is applied over lead 148 to operate start relay 154 to initiate testing by circuits (not described) according to a cycle established by punchings of record 26; provided that the coding of the magazine contacts coincide with the record codings set up by punchings therein. Opening of switch 152 by applying shock to the magazine also disables operation. The record number may be punched in decimal or bi-quinary code. In a modification (Fig. 5) the outputs of decoder network 116 are connected directly to the ten inputs of " or " gate 122 and a bank 156 of five switches operated by bi-quinary punchings of record 26 is connected between contacts 94b-94f and the inputs of the decoder network. Other arrangements of the contacts of groups 78a to 78c may be used. Series interlocking of the magazine and socket contacts may be employed (Fig. 6, not shown).