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04.08.2005, Folie 1 Hottinger Baldwin Messtechnik GmbH A. Louvier
A.Louvier
Support technique
a.louvier @hbm.com
www.hbm.com
Influence du
cble sur unmontage pont
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04.08.2005, Folie 2 Hottinger Baldwin Messtechnik GmbH A. Louvier
Diffrents modes de cblage pour unmontage de jauges en pont
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04.08.2005, Folie 3 Hottinger Baldwin Messtechnik GmbH A. Louvier
Le plus simple :
Vout
R2 R3
R4Vin
Montage 2 fils
Montage 2 fils
=
kR
R
0
k
RR0
=
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04.08.2005, Folie 4 Hottinger Baldwin Messtechnik GmbH A. Louvier
Facile raliser
Solution bon march
tous les changements de rsistance sont mesurs
Caractristiques du montage 2 fils:
Montage 2 fils
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04.08.2005, Folie 5 Hottinger Baldwin Messtechnik GmbH A. Louvier
Circuit quivalent dun montage 2 fils
Vout
R2 R3
R4
Vin
k
RR
RR
cableSG
cableSG
+
+
=)(
)(
1/2 Rcble
1/2 Rcble
Montage 2 fils
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04.08.2005, Folie 6 Hottinger Baldwin Messtechnik GmbH A. Louvier
Exemple:
Jauges en pont en montage 2 fils
Rsistance des fils (aller et retour): 0,432 /m
longueur des cbles: 10 m
VmVV
Vk
V
V
mmk
R
R
RmmR
in
out
in
out/961017730
4
03,2
4
/1773001773,003,2
120
32,4
32,410/432,0
==
==
=
=
==
Dcalage de zro --- d aux cbles1.Effet:
Montage 2 fils
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04.08.2005, Folie 7 Hottinger Baldwin Messtechnik GmbH A. Louvier
Recouper les fils dune jauge prcable en 2 fils affecte le zro
La rsistance nominale 120 des jauges HBM prsentes ci-dessus inclue lesrsistance des cbles.
Dcalage de zro
Montage 2 fils
Attention!
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04.08.2005, Folie 8 Hottinger Baldwin Messtechnik GmbH A. Louvier
Exemple:
Rsistance totale des fils: 1
Variation de temprature: 10K
Cofficient de temprature sur la rsistance du cble: = 0.0039 K-1
mmk
RR
KKRRR cablecablecable
/16003,2
120
039,0
039,01010039,01
=
==
===
Signal de temprature additionel d aux cbles2.Effet:
Montage 2 fils
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04.08.2005, Folie 9 Hottinger Baldwin Messtechnik GmbH A. Louvier
Influence de la variation de temprature sur le cblage
160 m/m
Cest 16 fois plus que leffet dune variation
identique sur la jauge elle mme.
Influence de la variation de temprature sur le cblage
160 m/m
Cest 16 fois plus que leffet dune variation
identique sur la jauge elle mme.
Montage 2 fils
Attention!
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04.08.2005, Folie 10 Hottinger Baldwin Messtechnik GmbH A. Louvier
Attnuation de la sensibilit3.Effet:
=
kR
R
0
= 0R
R
k
Le facteur k de la jauge diminue en fonction de
laugmentation de la longueur de cble
k
Vout
R2 R3
R4
Vin
RSG
+
=)(
)(
cableSG
SG
RR
R
k
1/2 Rcable
1/2 Rcable
Montage 2 fils
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O C S
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04.08.2005, Folie 11 Hottinger Baldwin Messtechnik GmbH A. Louvier
01,2121
12003,2
1211120
= ==
=
=
=+=+=
newnew
new
new
newcableSGnew
RRkk
kR
Rk
R
R
RRRR
Erreur env 1%!Erreur env 1%!
Exemple:
Rsistance totale des fils: 1 Facteur k de la jauge: 2,03
Montage 2 fils
Attnuation de la sensibilit3.Effet:
Attention!
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04.08.2005, Folie 12 Hottinger Baldwin Messtechnik GmbH A. Louvier
Dcalage de zro
... Refaire le zro sur lamplificateur
Variation de temprature additionelle... Veiller la constance de la temprature
Attnuation de la sensibilit... Calibration par shunt
Dcalage de zro
... Refaire le zro sur lamplificateur
Variation de temprature additionelle... Veiller la constance de la temprature
Attnuation de la sensibilit... Calibration par shunt
Effets du montage 2 fils... et les faons de les liminer
Montage 2 fils
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04.08.2005, Folie 13 Hottinger Baldwin Messtechnik GmbH A. Louvier
Umes
R2 R3
R4Ualim
Montage 3 fils
Montage 3 fils
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04.08.2005, Folie 14 Hottinger Baldwin Messtechnik GmbH A. Louvier
Un fil de plus quen montage 2 fils
La variation des rsistances de cble est
compense par le montage en pont de Wheatstone.
Lutilisation dun cble 3 conducteurs est recommande
pour garantir la parfaite quivalence des fils en terme delongueur, diametre, matriau,...
Caractristiques du montage 3 fils:
Montage 3 fils
df il Mi i i d ili i h di i l l h d dI d li
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04.08.2005, Folie 15 Hottinger Baldwin Messtechnik GmbH A. Louvier
R2 R3
R4
Vin
1/2 Rcable
1/2 Rcable Vout
Vout
( )
k
R
R
4
k
V
V4321
in
out
=
+=
Circuit quivalent dun montage 3 fils
Montage 3 fils
df il Mi i i t d ili ith di it l l tt h d dI t t d li
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04.08.2005, Folie 16 Hottinger Baldwin Messtechnik GmbH A. Louvier
( ) ( ) 0m/m8865m/m88654
2,03
U
U
4
k
U
U
m/m88650,008865
2,03
120
2,16
k
R
R
2,16Rm10/m0,216R
B
A21
B
A ===
=
=
==
Montage 3 fils
Dcalage de zro --- d aux cbles1.Effet:Exemple:
Jauges en pont en montage 3 fils
Rsistance des fils: 0,216 /m
longueur des cbles: 10 m
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04.08.2005, Folie 17 Hottinger Baldwin Messtechnik GmbH A. Louvier
( ) 0m/m80m/m804
2,03
V
V
m/m802,03
120
0,0195
k
R
R
0,0195K10K0,00390,5RRR
in
out
1cablecablecable
==
=
=
=
===
Montage 3 fils
Signal de temprature additionel d aux cbles2.Effet:
Exemple:
Rsistance de chaque fil: 0,5
Variation de temprature: 10K
Cofficient de temprature sur la rsistance du cble: = 0.0039 K-1
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04.08.2005, Folie 18 Hottinger Baldwin Messtechnik GmbH A. Louvier
=
kR
R
0
= 0R
R
k
Le facteur k de la jauge diminue en fonctionde laugmentation de la longueur de cble
k
Vout
R2 R3
R4
Vin
RSG
+
=)(
)(
cableSG
SG
RR
R
k
1/2 Rcable
1/2 Rcable
Montage 3 fils
Attnuation de la sensibilit3.Effet:
Vout
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p p g g p g y
04.08.2005, Folie 19 Hottinger Baldwin Messtechnik GmbH A. Louvier
2.02120.51202.03
R
Rkk
kR
Rk
R
R
120.50.5120RRRR
new
new
new
new
newcableSGnew
===
==
=+=+=
Montage 3 fils
Exemple:
Rsistance de chaque fil: 0,5 Facteur k de la jauge: 2,03
Attnuation de la sensibilit3.Effet:
Erreur env 0,5%!Erreur env 0,5%!
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Le dcalage de zro
... est limin si les 3 fils sont identiques
Les variations de temprature additionelles... sont limines si les 3 fils sont identiques
Attnuation de la sensibilit... Calibration shunt
Le dcalage de zro
... est limin si les 3 fils sont identiques
Les variations de temprature additionelles... sont limines si les 3 fils sont identiques
Attnuation de la sensibilit... Calibration shunt
Montage 3 fils
Effets du montage 3 fils... et les faons de les liminer
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Le problme dans les montages 2 et 3 fils:Perte de potentiel d la rsistance des cbles
Vcblel = RcbleI
VSG = Vtotal - Vcble
Rcble
Rcble
Jauge en montage pont
Calibration shunt
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Solution: Calibration shuntQuest ce que signifie calibration shunt ?
Rcble
Vcble = RcbleIRcble
RShunt
Jauge en montage pont
Calibration shunt
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Exemple: Rsistance de la jauge: 120
Valeur de la rsistance shunt: 220 k
5.2681000,220120
000,220
03.2
11
14
1
=
+
=
+=
=
+
=
ShuntSG
Shunt
SGin
out
SG
ShuntSG
ShuntSG
RR
R
k
R
R
V
V
RRR
RRR
Calcul du signal attendu en connectant la rsistance shunt
Calibration shunt
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Calibration shuntEn thorie:
Signal attendu en connectant la rsistance shunt :
= -268.5 m/m
En pratique:
Du fait de la perte en ligne, le signal sera plus faible que celui
calcul (et que la dformation physique vue par la jauge)
Solution: Augmenter le gain de lamplificateur, ou mieux, la tension
dalimentation du pont jusqu atteindre la valeur thorique.
Calibration shunt
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Montage 4 filsCircuit Kreuzer tendu
Avec les amplificateurs HBM ...
... cela est fait automatiquement!
Montage 4 fils
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Rcble
Rcble
Circuit quivalent :
Alim tension 2
Alim tension 4
Mesure 1
Montage 4 fils - Circuit Kreuzer tendu
Retour alim 2Amplificateur avec
lments decomplment de
pont
Montage 4 fils
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DMS
Retour alim 2
Rcble
RcbleRInt.
RH
RH
RS
RS
Mesure 1
Alim tension 2
Alim tension 4
Montage 4 fils
Montage 4 fils - Circuit Kreuzer tendu
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Le dcalage de zro... est limin
Les variations de tempratures additionelles... sont limines
Lattnuation de la sensibilit... est limine par le circuit Kreuzer tendu qui rgulela tension dalimentation directement aux bornes
de la jauge
Le dcalage de zro... est limin
Les variations de tempratures additionelles... sont limines
Lattnuation de la sensibilit... est limine par le circuit Kreuzer tendu qui rgule
la tension dalimentation directement aux bornes
de la jauge
Montage 4 fils
Effets du montage 4 fils
... et les faons de les liminer
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Merci...
... De votre attention
HBM France SAS
46 Rue du Champoreux
91540 Mennecy
Alain Louvier
Tel: 04 74 96 30 23
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