Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1980-06-11
1982-07-20
Sloyan, Thomas J.
Electricity: measuring and testing
Plural, automatically sequential tests
340347M, 340347R, G01R 1512
Patent
active
043408567
ABSTRACT:
To test the performance of an analog/digital converter, used for translating bipolar message signals into 8-bit words, the analog input of the converter is connected across a voltmeter while its digital output works into a buffer register distributing the seven amplitude bits of an emitted code word to one set of stage inputs of a comparator having another set of stage inputs connected to a manually operable word simulator; the sign bit of the code word is entered in a separate store. A logic network with inputs connected to the sign-bit store, the comparator and the word simulator controls two reversible counters which, upon manual operation of the word simulator, emit selected numerical values translated by associated digital/analog converters into output signals fed to the analog/digital converter to be tested. The values emitted by one counter represent entire quantization steps while those emitted by the other counter are aliquot fractions of such a step; the latter counter is started in response to sign-bit changes during an offset check and in response to comparator-output changes during a calibration check.
REFERENCES:
patent: 3603772 (1969-09-01), Paine et al.
patent: 3816813 (1974-06-01), Jehu
patent: 4272721 (1981-06-01), Beeman
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-122 to II-128.
Ross Karl F.
Sloyan Thomas J.
Societa Italiana Telecomunicazioni Siemens S.p.A.
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