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Increasing Range of Disk Converters

IP.com Disclosure Number: IPCOM000098867D
Original Publication Date: 1958-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Ruest, NR: AUTHOR

Abstract

This is a method for extending the range of digital to analog voltage converter systems which employ coded disk shaft position to digital converters in their feedback loops.

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Increasing Range of Disk Converters

This is a method for extending the range of digital to analog voltage converter systems which employ coded disk shaft position to digital converters in their feedback loops.

The problem arises when it is necessary to have a resolution greater by one or several orders of significance than that available with the particular number of coded follow-up disks being used. Normally an additional disk is added with resultantly greater unreliability, complexity and slew time.

The solution is to program the computer in such a manner that whenever a digital number exceeds the original range, its complement is used and concurrently a relay switches the potentiometer excitation voltages as shown in the diagram. The first part of the digital computer compares the input with the original range. If the input is within the original range, the relay does not alter the energization of the readout potentiometer and the complementary portion does not complement the digital input. However, if the range is exceeded by one order of significance, the range comparing portion of the digital computer alters the energization of the readout potentiometer and causes the digital input to be complemented. If the original range of the digital input exceeds the original range by more than one order of significance, similar range changes may be made.

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