Microprocessor Controlled Bridge: Microprocessor Controlled Bridge – Digital computers have been used in conjunction with test systems, bridges, and process controllers for several years. In these applications, computers were used to give instructions and perform operations on the data measured. When microprocessors were first developed they were used in much the same way as digital …
Delayed Sweep Oscilloscope: Many oscilloscopes of laboratory quality include a delayed sweep feature. Delayed Sweep Oscilloscope feature increases the versatility of the instrument by making it possible to magnify a selected portion of an undelayed sweep, measure waveform jitter or rise time, and check pulse time modulation, as well as many other applications. Delayed sweep …
Various CRT Connections and Controls in CRO Panel: Figure 7.16 shows various controls and Typical CRT Connections. The following controls are available on CRO panel. Intensity: It controls the magnitude of emission of the electron, beam, i.e. the electron beam is adjusted by varying the cathode-to-grid bias voltage. This adjustment is (folk by the 500 …
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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 …
Working Principle of Digital pH Meter | Block Diagram: Working Principle of Digital pH Meter – The Digital Measurement of hydrogen ion activity (pH) in a solution can be accomplished with the help of a pH meter. For those unfamiliar with the terminology, a very brief review is included. pH is a quantative measure of …
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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 …
Microprocessor Based DCS: Microprocessor Based DCS – Modern plants nowadays are very complex, large scale systems with a very high degree of automation. The designs and the operation of these plants are determined by the criteria of economy availability and safety. For example, in thermal power plants, greater unit capacity with higher temperatures and higher …
TDC 3000 Architecture: 1. Hiway Based Distributed Control: The building block concept of TDC 3000 Architecture control design, with distributed process controlled boxes linked together by a communication network, was first introduced by Honeywell in 1975. Today, the monitor and control boxes connected to the Data Hiway as shown in Fig. 21.77 are an integral …
DCS System: A DCS System is preferred over a central computer system for the following reasons. Central Computer System (CCS) exposes the plant to the risk that the system might fail. This can be minimized by having one or more back up schemes. A back up computer Analog controller Manual loading stations Various combinations of the …
Distributed Control System: Distributed Control System – Since the beginning of process control in late 1970s, it has made great progress in every control activity. Similar to the other electronic equipment, its size is decreasing and its power is increasing. The conventional instrumentation is now outdated. The speedy development in the field of electronics has …