What is null & deflection type instrument?

Advantages & disadvantages of null type & deflection type instruments.

1. COMSATS INSTITUTE OF INFORMATION T ECHNOLOGY


Advantages And Disadvantages Of Null-Type Method

Submitted To:
Mr. Arbab Shahid

Submitted By:
Hafiz khalid
SP14-BME-057


Grade: __________
Checked By: __________
Date: __________


Department of Mechanical Engineering

2. Null-Type Method:

A null-type device attempts to maintain deflection at zero by suitable application
of a known effect opposing the generated by the measured quantity. ...
The measured quantity produced some physical effects that engenders a similar but
opposing effect in some part of the instrument.
Deflection-type Method:
The Measured quantity produced some physical effects that engenders a similar but
opposing effects in some part of the instrument. The opposing Effect increases
until a balanced is achieved, At which point Deflection Is measured.
Advantages And Disadvantages Of Null-Type Method
Advantages
 They are Very much Accurate.
 They Are readily used for measuring.
Disadvantages
Due to addition Of Different weights involved this method become little difficult.
Advantages And Disadvantages Of Deflection-Type Method
Advantages
 Due to their convenient use these instrument are readily used for calibration .
Disadvantages
 They Are less accurate.