Browse Prior Art Database

Module Orientation Tester

IP.com Disclosure Number: IPCOM000083131D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Call, LG: AUTHOR [+6]

Abstract

Modules, such as passive RC network circuits with in-line pins, are correctly oriented prior to circuit board insertion.

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Module Orientation Tester

Modules, such as passive RC network circuits with in-line pins, are correctly oriented prior to circuit board insertion.

In Fig. 1, selected pins of randomly oriented modules (on a shaker table, for example) are electrically contacted and the detected characteristics compared to a reference. An "equal" indication permits orientation coding on the module, placement in a cartridge or magazine, or immediate insertion of the module in the circuit board without reorientation. A "not-equal" indication requires a different coding, placement in a different cartridge or magazine, or module reversal prior to insertion in the board. An incorrectly oriented module will be tested again after reorientation and rejected if the second test is also "not-equal".

In Figs. 2A and 2B, a constant current is applied to each of the capacitors through the pin selecting and reversing switches. When the charge on the reference capacitor C(R) reaches a predetermined level, the single-shot fires. If at the same time the charge in the test capacitor C(T) is within the limits of the comparator, there will be an output from the AND circuit. A subsequent latch circuit may record the equal/not-equal conditions for sorting/reversing decisions.

Additional tests are possible. A timer may cause reorientation if the voltages are not equal within a specified period following the beginning of a test. An operational amplifier, as in Fig. 3, can be used to compare the test module...