Lucrarea I
description
Transcript of Lucrarea I
Zrnescu Estera AnaFacultatea de Inginerie MedicalaGrupa 1424
Msurarea rezistenei electrice prin metode directe
Metodele directe de msurare utilizeaz aparate special construite n vederea msurrii, prin citire direct, a valorii mrimii msurate (ampermetre, voltmetre, ohmmetre, wattmetre etc.). n cazul msurrii elementelor parametrice de circuit, acestea necesit, pentru msurarea direct a R,L sau C, o energie de activare extern, asigurat de o surs de curent continuu (n cazul msurrii rezistenei electrice) sau de curent alternativ (pentru msurarea impedanei). Lanul de msurare specific aparatului respectiv convertete aceast mrime parametric (R,X sau Z) ntr-un curent sau o tensiune electric. Un instrument de msurare indic direct mrimea msurat. Pentru msurarea rezistenei electrice cele mai ntlnite aparate de msurare sunt ohmmetrele, ntlnite, de obicei, n componena multimetrelor analogice i numerice, ca funcii de msurare ale acestora.
Msurri i calculul erorilor pentru Rezistenele EtalonR etalon []Range[u.m.]Rx[u. m.]Rmax [] [%]
101010.02460.000250490.002505
1010010.01780.000700360.007004
101k0.010017k0.005200340.052003
1010k0.00993k0.05019860.501986
10100k0.0092k0.5001845.00184
101M0.000009M5.00018050.0018
100100100.01830.002500370.0025
1001k0.10002k0.00700040.007
10010k0.09995k0.0519990.051999
100100k0.0994k0.5019880.501988
1001M0.000099M5.001985.00198
10010M0.00009M50.001850.0018
100100M0.0001M500.002500.002
10001k1.000009k0.025000180.0025
100010k0.99997k0.06999940.007
1000100k0.9997k0.5199940.051999
10001M0.000999M5.019980.501998
100010M0.001M50.025.002
1000100M0.001M500.0250.002
10001000M0.001M5000.02500.002
1000010k9.99904k0.24998080.0025
10000100k9.9986k0.6999720.007
100001M0.009998M5.199960.052
1000010M0.00999M50.19980.501998
10000100M0.01M500.25.002
100001000M0.01M5000.250.002
100000100k99.9678k2.4993560.002499
1000001M0.09997M6.99940.006999
10000010M0.09998M51.99960.052
100000100M0.1M5020.502
1000001000M0.1M50025.002
10000001M0.999485M24.98970.002499
100000010M0.99976M69.99520.007
1000000100M0.9998M519.9960.052
10000001000M1M50200.502
n tabel: Rx valoarea citit de pe ohmmetruRmax eroare absolut - eroare relativ Exemplu de calcul:
[%]
Pentru Retalon = 10, Range = 10, Rx = 10.02460
%
Afiarea valorii se va face: Retalon [um]Rmax [um]Pentru exemplul de calcul, valoarea va fi: 10 0.0250492