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Abstract:
New digital communication between units is desired in the modernization of a system. Two units of an existing system are linked by circuitry that supplies direct current power, and the connecting wires have been selected for conversion to digital use. This wiring is located within a large bank of alternating current power cables and runs parallel to these cables for several hundred feet. The direct current system realizes no interference from this physical configuration, however, the power wiring radiates electromagnetic fields sufficient to couple noise voltage into a digital system. This project quantifies the effects of high levels of low frequency electromagnetic fields on standard digital communications wiring so that a sufficiently immune circuit configuration can be selected for any applications. A model of the expected electromagnetic environment is presented and wire termination voltage measurements are made under varying field and impedance conditions. Standard digital communication design is then examined for compatibility with this environment.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. |
| Pages: |
40 |
| Report Date: |
11 JUN 93 |
| Report Number: |
A671762 |
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