This document presents an overview of computer online measurement systems. It discusses how a data acquisition system works, including the key components of sensors, DAQ hardware, and a computer. Sensors convert physical properties into electrical signals. DAQ hardware conditions and digitizes analog signals for computer interpretation using components like signal conditioning circuits, analog-to-digital converters, and a computer bus. The computer controls the DAQ device using software and processes, visualizes, and stores measurement data. Computer online measurement can be used to measure, analyze, represent, and analyze physical phenomena by converting analog data to digital for computer analysis.

1. Dept of Clinical Psychology
University of Rajshahi

2. Md. Saidul Islam
Group Leader
Group Members
Syed Farid Ahmad Md. Abu Saeem Shawon
Prapti Biswas Md. Sumon Alamin
Md. Hasib Niloy
Md. Fahim Shahriar
Md. Rajib Matabbor
Md. Anwar Hossain

3. This Presentation Is Created For
:
Md. Leaket Ali
Assistant Professor,
Dept. Of Physics,
University of Rajshahi.

4. Computer on-line
measurement

5. Outlines
1. Introduction
2. Components
3. Working Procedure
4. Application

6. Introduction

7. Introduction
☆ computer monitoring and
controlling a physical
variable.
☆ An electronic instrument
dedicated to the
measurement and
quantization of analogue
signals to for digital analysis
or processing.
☆ The data acquisition
system is the analogue
interface to the digital world.

8. Data Acquisition:
☆ Data Acquisition is the
process of sampling signals.
☆ Converting the resulting
samples into Digital numeric
values.
☆ Measure real world
electrical or physical
conditions ( voltage, current,
temperature, pressure, sound)
☆ Manipulated by a computer.

9. Components ☆ Data acquisition
system consists of
three major
components.
☆ These are:
Sensor or Transducer,
DAQ measurement
hardware & a Computer.

10. Sensor or Transducer ☆ A sensor or a
transducer is a device
(e.g. ; thermistor,
photocell, strain gauge
etc.) that converts a
physical property (
temperature, light
intensity, gas pressure
etc) into a measurable
electrical signal.

11. DAQ Hardware ☆ DAQ hardware acts as
the interface between
signals from the outside
world and a computer.
☆ It primarily
functions as a device
that digitizes incoming
analogue signals (
from the sensor) so
that a computer can
interpret them.

12. DAQ Components The three key components of
a DAQ device used for
measuring a signal :
• Signal conditioning
• Analog-to- digital
• Computer bus

13. Signal conditioning:
☆ Signal conditioning
circuitry manipulates a
signal into a form that is
suitable for input an ADC.
☆ This circuitry can include
amplification, attenuation,
filtering and isolation.

14. Analogue to Digital converter
(ADC) :
☆ Analogue signals from sensor
must be converted into digital
before they are manipulated by
digital equipment , such as a
computer.
☆ The transducer's electrical
analogue output serves as the
input to the ADC.
☆ The ADC converts this
analogue into a digital
output.
☆ This digital output consists of
a number of bits that represent
the value of the analogue values
to binary values

15. Computer Bus :
☆ DAQ device connect to a
computer through a slot or
port.
☆ It serves as the
communication interface
between the DAQ device
and computer for passing
instructions and measured
data.

16. Computer : ☆ A computer with
programmable
Software controls
the operation of the
DAQ device and is
used for processing,
visualizing and
storing
measurement data.

17. Applications: ☆ Computer on-line
measurement can be used
to measure and analyze the
operating properties of a
physical phenomena.
☆ Computer on-line
measurement can be used to
represent and analyze the
physical phenomenal
analogue data to digital data
with the help of a computer.

18. Q & A:
Is there any
Questions ?

19. Thank you
😄