This document outlines an out-of-class activity for second year electronics engineering students on digital multimeters (DMM). The learning objectives are for students to be able to list the needs and advantages of digital instruments, think of the blocks required for a DMM, and write specifications of digital instruments. Key concepts covered include electronic instruments, analog instruments, digital instruments, and the functions and basic blocks of a DMM. The advantages of digital instruments discussed are accuracy, resolution, repeated measurements, lower power needs, and digital output.

1. Pradeep Patil – Flipped Classroom (L1)
under Open Education Resources Creation
DOMAIN : Second Year
TOPIC : Electronic Instrument – Digital Multimeter (DMM)
COURSE : Electronic Instruments and Measurement
AFFILIATION : Walchand College of Engineering , Sangli
1
TARGET AUDIENCE : Second Year
Electronics Engg
students
Out-of-class_ppt for video - v2

2. Out-of-class Activity Design – L1
At the end of watching the videos student should be able to,
1. List or write need and advantages of electronic & digital
instruments (Recall / Understand Level)
2. Think of blocks required for DMM .
3. Write specifications of digital instruments (Apply Level)
1. Electronic instrument / measurement
2. Analog instruments
3. Digital Instruments
Learning Objective(s) of Out-of-Class Activity:
2
Key Concept(s) to be covered:
Out-of-class_ppt for video - v2

3. Out-of-class_ppt for video - v2 3
Advantages of Digital Instruments:
1. The digital instruments indicate the reading directly in
decimal numbers. So, no observational error.
2. More accuracy.
3. Resolution is more. i.e one tenths or one hundredth of
volt can be measured.
4. Repeated measurement – i.e. 7 to 10 times measurement is
carried out in 1 minute.
5. The digital instrument requires smaller power.
6. Its output is in digital form , so it is directly fed into
the memory .

4. Digital Multimeter (DMM) –
Functions
 Can measure – 1) DC voltage , 2) AC voltage
3) Current , 4) Resistance
4Out-of-class_ppt for video - v2

5. Block diagram of Digital Measurement System
5Out-of-class_ppt for video - v2

6. • In digital instrument (DMM) , analog to
digital (ADC) is required & parameter is
displayed in terms of digits on digital display.
• Input requirement for ADC is dc voltage.
Basic block – ADC ( DC DVM)
6Out-of-class_ppt for video - v2

7.  Additional blocks –
 To measure AC voltage - ?
 To measure current - ?
 To measure resistance - ?
Basic block – ADC ( DC DVM)
7Out-of-class_ppt for video - v2

8. • For 3 and ½ digit display , count will be
from 0000 to 1999.
• So , resolution will be --
n = 3
R = 1/ 10 3 = 0.001 Volts 8Out-of-class_ppt for video - v2