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

What do you mean by inaccessible area coverage, Q. What do you mean by Inac...

Q. What do you mean by Inaccessible area coverage? Marshy lands, hilly areas, etc where ground surveys could be very difficult, remote sensing technique can provide reliable an

Voltage regulator, Voltage regulator: A voltage regulator is an electr...

Voltage regulator: A voltage regulator is an electrical regulator intended to automatically keep a constant voltage level. A voltage regulator is an instance of a negative fee

Explain the working of a photo - transistor with a sketch, Q. Explain the w...

Q. Explain the working of a photo - transistor with a sketch A second optoelectronic device that conducts current when exposed to light is the PHOTOTRANSISTOR. A phototransisto

Determine the magnitude of the current, Determine the magnitude of the curr...

Determine the magnitude of the current: For the circuit of Figure below determine the magnitude of the voltage "drops" across each resistor R1 - R7. Determine the magnitude

Inquire, how we can say that 3 phase induction motor is short curcited pra...

how we can say that 3 phase induction motor is short curcited practically?

Compute the average number of open links, A zipper has N links every link h...

A zipper has N links every link has a state in which it is closed with energy 0 and a state in which it is open with energy 0 We require that the zipper only unzip from one side (s

Inductive logic programming, Inductive Logic Programming : Now here ha...

Inductive Logic Programming : Now here having studied a non-symbolic approach to machine learning on Artificial Neural Networks then we return to a logical approach, namely In

Define super scalar architecture, Define super scalar architecture. Su...

Define super scalar architecture. Super scalar architecture: The Pentium microprocessor is organized along with three execution units. Individual executes floating-point inst

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