EMI608 - Data Acquisition Systems (DAQ)

Описание: Data Acquisition Systems (DAQ)
Data acquisition system is used for data processing, data conversion, data transmission and data storage
The typical data acquisition system consists of sensors with necessary signal and display systems
DAS are used to convert analog waveforms into digital values for processing
Data acquisition applications are controlled by software programs developed using various general purpose programming languages such as BASIC, C, Fortran, Java and Pascal

Data Acquisition Systems – Factors
The important factors that decide the configuration and sub systems of the data acquisition system are as follows.
Accuracy and resolution
Number of channels to be monitored
Analog or digital signal
Single channel or multichannel
Sampling rate per channel
Signal conditioning requirements of each channel
Cost

Various General Configurations of DAS
1. Single channel possibilities
(i) Direct conversion
(ii) Pre-amplification and direct conversion
(iii) Sample and hold, and conversion
(iv) Pre-amplification, signal conditioning and any of the above
2. Multi channel possibilities
(i) Multiplexing the outputs of single channel converters
(ii) Multiplexing the output of sample-hold circuits
(iii) Multiplexing the inputs of sample-hold circuits
(iv) Multiplexing low level data

Objective of a DAS
Acquire the necessary data, at correct speed and at the correct time.
Use of all data efficiently to inform the operator about the state of the plant.
It must monitor the complete plant operation to maintain on-line optimum and safe operations.
It must be able to collect, summarizes and store data for diagnosis of operation and record purpose.
It must be flexible and capable of being expanded for future requirements.
It must be reliable, and not have a down time greater than 0.1%.

Applications of Measurements
In many industrial applications, mechanical quantities like temperature, pressure, flow, velocity and so on are measured
In robotic tactile and manufacturing applications
In control systems when motion feedback is employed
In process testing, monitoring and diagnostics applications
Engineers and scientists in nearly every industry use data acquisition (DAQ), for validating and verifying a design prototype, teaching in a university lab, diagnosing a machine malfunction, or controlling a manufacturing process

Contact Details
Mr. S.S. NAGA PAVAN KUMAR T, M.Tech, (Ph.D)
Assistant Professor,
Department of Electronics and Communication Engineering,
Vignan's LARA Institute of Technology & Science,
Vadlamudi, Guntur, A.P. -522213
Email: [email protected], [email protected]
Ph: 9866583720, 6301086941
You Tube Channel:    / @techeducation7168