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Digital Instruments

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 – 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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Digital Capacitance Meter Block Diagram

Digital Capacitance Meter Block Diagram: Digital Capacitance Meter – Since the capacitance is linearly proportional to the time constant, when a capacitor is charged by a constant current source and discharged through a fixed resistance, we can use a 555 timer along with some digital test equipment to measure capacitances. One obvious way is to …

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Digital Phase Meter Block Diagram and Working Principle

Digital Phase Meter Block Diagram and Working Principle: Digital Phase Meter – The simplest technique to measure the phase difference between two signals employs two flip-flops. The signals to be fed must be of the same frequency. First, the signals must be shaped to a square waveform without any change in their phase positions, by …

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Digital Measurement of Frequency (Mains)

Digital Measurement of Frequency (Mains): Digital Measurement of Frequency (Mains) – The conventional method of measuring the frequency of an electrical signal consists of counting the number of cycles of the input electrical signal during a specified gate interval. The length of the gate interval decides the resolution of the Measurement. The shorter the gate …

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Different Modes of Operation of Electronic Counter

Different Modes of Operation of Electronic Counter: The decade counter can be easily incorporated in a commercial test instrument called an electronic counter. A decade counter, by itself, behaves as a totaliser by totalling the pulses applied to it during the time interval that a gate pulse is present. Typical Different Modes of Operation of …

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