Instrumentation & Measurement Techniques: Department of mechanical Engineering by Gaurav Mx

Author:Gaurav, Mx [Gaurav, Mx]
Language: eng
Format: azw3
Publisher: UNKNOWN
Published: 2019-05-02T16:00:00+00:00

• Factors contributing to error (i.e. bias) “A thermometer always indicates a temperature intermediate between that of the region being investigated and any other environment with which the thermometer has thermal communication.”

– Self heating

T

measure Tmeasure V As the current is increased, if T is no longer constant, then ρ is no longer constantT

q

Ts

Thermal Rcond qresistance,RcontactRT

Ts

2shetTIRR∆=

RT (K/W)

I q(W ) = I2Re = ∆T

RT

A compromise must be made between signal uncertainty and self-heating error

Low I: X UT ,I =T UI I High I:∆TSH

ST x

UT ,I

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