Digital Instruments

Fully Automatic Digital Instrument

Fully Automatic Digital Instrument: Fully Automatic Digital Instrument – A multimeter with automatic polarity indication, automatic zero correction and automatic ranging (of course coupled with automatic decimal point indication) only needs a signal applied to its input, and a command as to what quantity (Vdc, Vac, I or R) to measure; it does all the …

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Digital Tachometer Working Principle

Digital Tachometer Working Principle: Digital Tachometer Working Principle technique employed in measuring the speed of a rotating shaft is similar to the technique used in a conventional frequency counter, except that the selection of the gate period is in accordance with the rpm calibration. Let us assume, that the rpm of a rotating shaft is …

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IEEE 488 Bus Block Diagram


IEEE 488 Bus Block Diagram: The purpose of IEEE 488 BUS is to provide digital interfacing between program­mable instruments. There are many instrumentation systems in which interac­tive instruments, under the command of a central controller, provide superior error-free results when compared with conventional manually operated sys­tems. Problems such as impedance mismatch, obtaining cables with proper …

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Microprocessor Based Instruments

Microprocessor Based Instruments

Microprocessor Based Instruments: Microprocessor Based Instruments – Digital instruments are designed around digital logic circuits without memory. The use of microprocessors as an integral part of measuring instruments has given rise to a whole new class of instruments, called intelligent instruments. Figure 6.28 shows a block diagram of a microprocessor based impedance measuring instrument. The …

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Automation in Digital Instruments

Automation in Digital Instruments: Automation in Digital Instruments – One of the advantages of digital multimeters is their ease of operation. The reading is easy to take and does not lend itself to errors of interpretation. Moreover, the number of ranges is limited because the ranges move in steps of 10 (instead of the √10 …

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