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Ohmmeter for Resistive Bridges or Networks

IP.com Disclosure Number: IPCOM000093559D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Merrill, JF: AUTHOR

Abstract

The resistance between any two nodes of a passive network can be measured without changing the network. One of the nodes is connected to the input of an operational amplifier and the other node is connected to the output of the amplifier. All the other nodes are grounded. If a known current is fed into the input of the amplifier, the output is then equal to the product of the known current and the unknown resistance between the two nodes in question. In the case of a bridge, only one of the unused nodes need be grounded.

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Ohmmeter for Resistive Bridges or Networks

The resistance between any two nodes of a passive network can be measured without changing the network. One of the nodes is connected to the input of an operational amplifier and the other node is connected to the output of the amplifier. All the other nodes are grounded. If a known current is fed into the input of the amplifier, the output is then equal to the product of the known current and the unknown resistance between the two nodes in question. In the case of a bridge, only one of the unused nodes need be grounded.

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