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

Lt metering or low tension metering, LT Metering or Low Tension Metering ...

LT Metering or Low Tension Metering The subsequent types of meters are generally used for LT consumers: Whole Current Meters i)   Single phase meters ii)   3-phase

#electrical wiring, how to draw electric circuit for staircase wiring using...

how to draw electric circuit for staircase wiring using 3 two way switches?

Compare call and push instructions, Compare CALL and PUSH instructions ...

Compare CALL and PUSH instructions CALL PUSH When CALL is implemented the microprocessor automatically stores the 16-bit address of the instruction next to CALL on the sta

Successive-approximation analog to digital converter, Successive-approximat...

Successive-approximation analog to digital converter This converter, shown in Figure, also contains a D/A converter, but the binary counter is replaced by a successive-approxim

Clampers, what would the change after adding a registor paralelly in clampe...

what would the change after adding a registor paralelly in clampers?

Advantages of subscriber loops signalling, Q. Advantages of subscriber loop...

Q. Advantages of subscriber loops signalling? (i) Information can be exchange between processors much more faster than when channel associated signalling is used. (ii) As a

Science day, i need to submit a still model or a working model on science d...

i need to submit a still model or a working model on science day(28 February). can you help me....

Find the source voltage, Q. A semiconductor diode with IS = 10µA and a 1-k...

Q. A semiconductor diode with IS = 10µA and a 1-k resistor in series is forward-biased with a voltage source to yield a current of 30mA. Find the source voltage if the diode I-V e

Explain mesh - current method, Q. Explain Mesh - Current Method? This c...

Q. Explain Mesh - Current Method? This complements the nodal-voltage method of circuit analysis. A set of independent mesh-current variables that implicitly satisfy the KCL equ

Gis applications in management of power distribution systems, GIS Applicati...

GIS Applications in Management of Power Distribution Systems: a.)        Inventory of existing network. b.)        Easy access to network details. c.)        Easy access

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