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

Determine the equivalent capacitance, Q. Determine the equivalent capacitan...

Q. Determine the equivalent capacitance at terminals A-B for the circuit configurations shown in Figure.

Explain power-system loads, Q. Explain Power-System Loads? Figure repre...

Q. Explain Power-System Loads? Figure represents a one-line (single-line) diagram of a part of a typical three-phase power system. Notice the symbols that are used for generato

Define the term paging unit, Define the term Paging Unit. Paging Unit:...

Define the term Paging Unit. Paging Unit: The paging mechanism functions along with 4K - byte memory pages or along with a new extension obtainable to the Pentium with 4M byt

Design a 4-bit universal shift register, Q. Obtain a block diagram of a shi...

Q. Obtain a block diagram of a shift-left/right register using D flip-flops. Q. Design a 4-bit universal shift register. Q. (a) Show a block diagram of an SRFF connected to s

Scr, What is finger voltage in a scr?

What is finger voltage in a scr?

Find the maximum probable percentage error, Q. A current of 65 A is measure...

Q. A current of 65 A is measured with an analog ammeter having a probable error of ±0.5% of full scale of 100 A. Find the maximum probable percentage error in the measurement.

What is a bode plot and what are i''s uses, Q. (i) What are the different t...

Q. (i) What are the different types of plots for frequency response in an RC coupled amplifier?     (ii) What is a Bode Plot? What are it's uses? The different types of

Compute the source current, Q. A 230-V, single-phase, 60-Hz source supplies...

Q. A 230-V, single-phase, 60-Hz source supplies two loads in parallel. One draws 10 kVA at a lagging power factor of 0.80 and the other draws 6 kWat a lagging power factor of 0.90.

Calculation of receiving end voltage, Calculation of Receiving End Voltage ...

Calculation of Receiving End Voltage Consider the simple circuit shown in Figure. To find the voltage V 2 using analytical method:   P = I V 2 = 0.5      ..... (1)

Guarding Against Loss in Transformers, Guarding Against Loss in Transformer...

Guarding Against Loss in Transformers Distribution transformers are expected to convert up to 95-98% of the input power into usable output power. A distribution transformers i

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