 What id DMM?  Block Diagram.  Specification of DMM.  Measurement of Resistance, Voltage & current By using DMM.  Types of DMM.  Advantages, Dis-Advantages & Application.  Q-A Section.  References

1. DEPARTMENT OF ELECTRICAL ENGINEERING
Subject Name:- Electrical Measurement & Instrumentations
Group no. :- 09
Self learning activity
Topic : Digital Multi-Meter

2. index
What id DMM?
Block Diagram.
Specification of DMM.
Measurement of Resistance, Voltage &
current By using DMM.
Types of DMM.
Advantages, Dis-Advantages &
Application.
Q-A Section.
References

6. Block Diagram

12. Types of Digital Multimeters
 Clamp Multimeter
It is a type of digital multimeter in which
one can only measure the flow
of electricity. It has a type of clamp
feature in it as the name suggests it. This
clamp is capable of measuring the
current flow when the two probs get
connected to the voltage. Whereas, the
electric power can be calculated by using
it by multiplying the current flow with
the voltage.

13.  Fluke Multimeter
It is a type of digital multimeter which is used
for several purposes which consists of a big
display and is generally used to calculate the
voltage as well as the resistance. Sometimes
an advanced version of it is also used to
calculate the duty cycle, temperature,
humidity, frequency, pressure, and many more
electrical parameters. This is not used
commonly as it has many features in it and
only professionals can use it with ease. It also
helps in adjusting different types of electrical
parameters. It is protected by a transient
voltage.

14.  Auto Ranging Multimeter
It is a type of digital multimeter which is
quite simple and expensive compared to
any other type of digital multimeter. It is
mainly used to calculate all the
parameters and properties of an electronic
device. It consists of a knob in its middle
which is used to calculate the parameters.
It is generally used by those who are not
professional or electricians. It is capable
of calculating one electrical property or
parameter at a time.

16. Disadvantages
 Digital values sometimes fluctuate rapidly
until the reading stabilizes, making them more
difficult to read.
 It may take longer for values to “settle” in
some applications, slowing work.
 Digital multimeters are more susceptible to
external noise.

17. Applications
 It is used to measure AC and DC voltage and current.
 It is also used to measure resistance.
 It is also used to check the diodes.
 It is also used to measure the frequency as well as the
capacitance of an electronic device.
 It is also used to test batteries, switches, light bulbs, and outlets.
 It is also used to determine any faults present in the electric
circuit.
 It is used to measure the time and frequency of the electronic
device.
 It is also used to check the temperature of the electronic device.

19. Questions & Answers
Que 1) Which type of error is present in a multimeter?
Ans. The type of error which is present in a multimeter is a normal mode error.
Que 2) How many types of Digital Multimeters are there?
Ans. There are mainly Three types of Digital Multimeters which are Clamp
multimeters , Fluke multimeters & Auto Ranging Multimeter.
Que 3) What is the most common type of Digital multimeter used?
Ans. The most common type of multimeter used is the fluke multimeter.
Que 4) Which is a better digital or analog multimeter?
Ans. The digital multimeter is better than the analog multimeter as they are more
accurate.

20. References:
 Stephen A. Dyer, Wiley Survey of Instrumentation and Measurement, John
Wiley & Sons, 2004 ISBN 0471221651, pp. 277–281.
 "Digital Multimeter Measurement Fundamentals". National Instruments.
Retrieved 26 January 2008.
 Keysight Technologies. "Keysight 3458A Digital Multimeter Data
Sheet" (PDF). Keysight Technologies. Archived (PDF) from the original on
9 October 2022. Retrieved 31 July 2014.
 Fluke Manufacturing. "Logging and analyzing events with FlukeView
Forms Software" (PDF). Archived (PDF) from the original on 9 October
2022. Retrieved 28 January 2007.