IEEE 488 BUS: 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 connectors and […]

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 […]

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 […]

Digital Measurements of Frequency Mains

Digital Measurements of Frequency Mains: Digital Measurements 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 […]