emmi ppt by krunal ganvit

1. GOVERNMENT ENGINEERING
COLLEGE-BHUJ,370001
ELECTRICAL ENGINEERING
SUBJECT:- ENGINEERING MEASURMENT
AND
MEASURING INSTRUMENT
PROF. :- Y.C.PATEL

2. NAME ENROLLMENT NO.
GANVIT KRUNAL 150150109039
CHUDASAMA BRIJRAJSINH 150150109024
BHALIYA MILAN 150150109009
ARADIYA ALPESH 150150109003
DHADUK PRASHANT 150150109029

3. Classification of Instrument

4. INTRODUCTION
The term measurement is defined as the
comparison of the unknown quantity with the
standard quantity.
A measuring instrument or meter for a
particular parameter or variable is a device or
a system which determines the value of the
parameter or variable by giving its magnitude.

5. Classification of Instrument
Absolute and Secondary Instrument.
Analog and Digital Instrument.
Deflection and Null type Instrument.

6. Absolute instrument:-
These instrument read the quantity under
measurement indirectly i.e. in terms
deflection, degrees and meter constant.
The actual value under measurement can be
calculated by using the formula=deflection
multiple by constant meter.
Ex. of these instrument:-
(1) Tangent galvanometer
(2) Current balance meter

7. Secondary Instrument:-
These instrument read the quantity under
measurement directly i.e. the meter commonly
used that as ammeter , voltmeter , watt meter
and energy meter.
Types:-
1)Depending upon the principle of
operation.
2)Depending upon permissible percentage error.
3)Depending upon application.

8. Analog Instrument :-
The signal which continuously vary and take
infinite values for a given range are called as
analog signal. The instrument that involves the
use of analog signal is called as an analog
instrument.
In analog system the function continually varies.
E.g. deflection type instrument like PMMC
ammeter , voltmeter , Null deflection instrument
like DC potentiometer ,Whetstone meter bridge
etc.

9. Digital Instrument:-
The signal which vary in discrete steps and
take a finite different values in the given range
are called digital signal. The instrument that
use of digital signal is called as digital
instrument.
E.g. of digital instrument are logic analyzer,
Microprocessor based instrument, computer,
Digital counter etc.

10. Deflection Instrument:-
Deflecting Type:-
In a Deflection type system,
the quantity to be measured produces an
effect either in the form of a voltage or a
current. This effect is then utilized to produce
a torque that causes a mechanical deflection.
Example:-
Wattmeter

11. Null Instrument:-
Null Type:-
In a Null type Instrument, the
quantity to be measured produces an effect
that is compared with an already calibrated
effect of another system. It is required to
obtain a zero value.
Example:-
Galvanometer

12. THANK YOU!!