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I$', &6The following figure shows a two terminal' _. B,), . "

' ,& , Show how it works; explain its measurement these

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- CO&~ Code: ~ ~ 7 3 2

-0iiect connect rnodwlar - fwo-wire

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Ball conductor 'Given a Platinum Resistive ~hermometerof 120 ohms. I ts Heat dissipation factor = 7

rl/K when immersed in air a n d 4 mW/K when immersed in water. Calculate th e maximumcurient through the sensorto keep-the self heating error below 0. lac.

0 k ~ 2 7 7 ~i s a precision op amp that ha s Vb =65 pV with 1.5 P/OC drift, I b =3nA withdrift, P, =50mW when'supplieda t k1.V (all maximal values). an d Bp =I50 'C/W for a

piastic ' b l ~ ~ p a c k a g e .Cakulate i ts actual input offset voltage and currents when used in aamplifier supplied a t f 15 V, with Rz =200 kfl and R1=20Q0;the input voltage is

resi'stan is 20 kZ1. and the ambient temperature h i d e the equipment i s 40C S , *OF'

-. .?-?>:Th e following figure shows-a two terminal Resistm,veTemperature Detector. 0h9y fiak it. .works; explain i t s nieasurement errors and how to overcome'these'enorproblems.

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.- .. - .-- I -rCOLLEm QF ENGINEERING & TECHNOLOGY~ e ~ i r t m@ $Electronicsand Communimtions Engineering~wtur e c~ :~hE .Khaled Shehata Banady HusseinCourse 'AutomatedMeasurementCiwrseCode: EC732 Time :1.5 hrs

-

Date :211 -12-2009 TotalMarks :20. ,

F*. I-,.Q l . State wheher statements are truc or false and correct the wrong cine-

capacitancgwith it \

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to reducf: the self heatihg pr05lem in RTDI --to 120'~is to be measuieduit shown and a m- f i lm PtlOQ(SMSPD from

arid a= 0.00385NQ/K at OOCJF fiO>~W/E;Tin 0.4m/s ~~fer,'*and~-@ns8?ity(S)= I m v k . ~ a l c u l ~ i '.-Rr if the reference

, ~oitage&ifiii1,@@r' = 5 V. .,- .

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+- Resistance hd ixunstkdedSealed outer - ..

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7 r 6- . .- .- * - - - - -dV = M I + fdR s=,q&= Q R ~=Q&.

B ( l / T - l J T o ] .I . *d+y&+ -. -fRr = &e . . . s , ,&;-Y' A(t) = N s ( t ) if8 m ... 5- .-+I )MTBF = m = X - IlliR2MI1 1B= I I : h - 1

T I T2 . . .I- . -- 1( /RT/dT BRTrRT(l- , a ) , _- --I$= = RTI(I - i) where 0 3 = RT T? ,.I1RTr+ Rr(l -a )

-8. &[I +x(T - To)] 298,i5-K100 -Sopo I'R Atpila (a)'=" , R/hZ i"C?4?., =- 100x&$I\ n'

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