Computer controlled cable tester
First Claim
1. A device for determining interconnections between terminal positions at opposite ends of a cable, comprising:
- means for testing said terminal positions, comprising;
means for initializing said terminal positions with a first logic signal;
demultiplexing means for sequentially selecting each terminal position as a test point and applying a test voltage thereto;
resistor means for applying a load resistance effective to maintain a second logic signal at each terminal position having the test voltage thereon and to maintain the first logic signal at each terminal position not having the test voltage thereon;
memory means for storing the logic signals present at all terminal positions during application of the test voltage to the test point; and
multiplexing means for determining subsequent to removal of the test voltage from the test point the logic signal stored at the memory means for each terminal position, a stored first logic signal being indicative of a terminal position not having a common connection with the test point and a stored second logic signal being indicative of a terminal position having a common connection with the test point;
connector means for connecting said means for testing with said terminal positions; and
interface means for interfacing with a computer.
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Accused Products
Abstract
A device for determining interconnections between terminal positions at opposite ends of cable includes a test circuit, connectors for connecting the test circuit to the terminal positions of the cable and a connector for interfacing the test circuit with a computer. The test circuit sequentially selects each of the terminal positions of the cable as a test point and includes a demultiplexing/multiplexing device for applying a test voltage to the selected terminal position, a resistor for maintaining a load resistance effective to provide a second logic signal at each terminal position other than the terminal position as the test point to which the test voltage is applied and to maintain a first logic signal at each terminal position to which the test voltage is not applied, a memory device for storing the logic signal present at each terminal position during application of the test voltage to the selected test point terminal position, and the demultiplexing/multiplexing device for determining, subsequent to removal of the test voltage from the test point, the logic signals stored by the memory device for each terminal position. A stored first logic signal is indicative of a terminal position not having a common connection with the test point and a stored second logic signal is indicative of a terminal position having a common connection with the test point. A method for determining interconnections between terminal positions at opposite ends of a cable includes operating the above described device.
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Citations
16 Claims
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1. A device for determining interconnections between terminal positions at opposite ends of a cable, comprising:
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means for testing said terminal positions, comprising; means for initializing said terminal positions with a first logic signal; demultiplexing means for sequentially selecting each terminal position as a test point and applying a test voltage thereto; resistor means for applying a load resistance effective to maintain a second logic signal at each terminal position having the test voltage thereon and to maintain the first logic signal at each terminal position not having the test voltage thereon; memory means for storing the logic signals present at all terminal positions during application of the test voltage to the test point; and multiplexing means for determining subsequent to removal of the test voltage from the test point the logic signal stored at the memory means for each terminal position, a stored first logic signal being indicative of a terminal position not having a common connection with the test point and a stored second logic signal being indicative of a terminal position having a common connection with the test point; connector means for connecting said means for testing with said terminal positions; and interface means for interfacing with a computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining interconnections between terminal positions at opposite ends of a cable, comprising the steps of:
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initializing the terminal positions with a first logic signal, sequentially selecting each terminal position as a test point and applying a test voltage thereto, while a load resistance effective to maintain a second logic signal at each terminal position having the test voltage thereon and to maintain the first logic signal at each terminal position not having the test voltage thereon is applied; storing the logic signals present at all terminal positions during application of the test voltage to the test point; and determining, subsequent to removal of the test voltage from the test point, the logic signal stored for each terminal position, wherein a first logic signal is indicative of a terminal position not having a common connection with the test point and a stored second logic signal is indicative of a terminal position having a common connection with the test point. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification