Drift related to the instruments, Electrical Engineering

Assignment Help:

If the instruments has no drift it is perfectly reproducible. No drift means that with a given input the measured values do not vary with time.

Drift may be classified into three categories:

(1) Zero Drift: If the whole calibration gradually shifts due to slippage permanent set or due to undue warming up of electronic tube circuits, zero characteristics with zero drift are shown in fig(a).

(2) Span Drift or Sensitivity Drift: If there is proportional change in the indication all along the upward scale, the drift is called  span drift or sensitivity drift. The characteristics with span drift are shown.

(3) Zonal Drift: In case the drift occurs only over a portion of span of an instrument, it is called zonal drift. There are many environmental factors which cause drift. They may be stray electric and magnetic fields, thermal EMFs changes in temperature, mechanical vibration, wear and tear and high mechanical stresses developed in some parts of the instruments and systems.

Drift is undesirable quality in industrial instruments because it is rarely apparent and cannot be easily compensated for. Thus it must be carefully example, stray electrostatic and electromagnetic fields can be prevented from affecting the measurements by proper shielding. Effect of mechanical vibrating can be minimized by having proper mountings. Temperature changes during the measurement process should be preferably avoided or otherwise be properly compensated for.

 

 


Related Discussions:- Drift related to the instruments

Sketch the labelled frequency response, Question: (a) Consider the foll...

Question: (a) Consider the following RC admittance function: (i) If the function is to be realised using the Cauer II Form, find the values of the different components

Explain the nand gates - microprocessor, Explain the NAND Gates - Microproc...

Explain the NAND Gates - Microprocessor? The NAND GATE is a AND gate with the output inverted. Consequently the outputs of a NAND gate would be the opposites of the outputs of a A

condition, explain how conduction take place in conducto

explain how conduction take place in conductor

Explain ferroelectricity, Explain ferroelectricity. Ferroelectricity: ...

Explain ferroelectricity. Ferroelectricity: - Materials of ferroelectric have a high dielectric constant that is non-linear that is, this depends to a considerable extent on t

Explain the working of frequency division, Explain the Working of Frequency...

Explain the Working of Frequency Division? A frequency divider able to be constructed from J-K flip-flops by taking the output of one cell to the clock input of the next and th

Earth leakage-earthing, Earth Leakage : Earth leakage takes place when, th...

Earth Leakage : Earth leakage takes place when, through some fault in an appliance or its connections. Electric current escapes to earth i.e. the body of the appliance become 'liv

Explain properties and application of copper, Explain properties and applic...

Explain properties and application of Copper. Properties 1) Cooper is reddish brown in color. 2) Cooper is malleable and ductile and can be forged, cast, rolled, mach

Basic operations of 8085 microprocessor , Basic Operations of 8085 Micropro...

Basic Operations of 8085 Microprocessor The 8085 microprocessor  performs followings  five  basic  operations . 1. Opcode Fetch :  Reading and decoding  operation code  of

Positive edge triggered d flip flop , Positive  Edge Triggered D Flip Flop...

Positive  Edge Triggered D Flip Flop In this type  of D flip Flop  ( 7475)  shown in figure  the output changes with  positive  edge  of the CLK when CLK  changes  from 0 to 1

4gls - fourth generations languages, 4GLs (Fourth Generations Languages) ...

4GLs (Fourth Generations Languages) These  are called  non procedural  languages May be considered as  advanced HLL. Objects oriented programming  languages and language  with

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd