tugas elektronika instrumentasi kelompok 5

7/26/2019 Tugas Elektronika instrumentasi kelompok 5

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ANGGOTA KELOMPOK : ALIT JULIANI NI KOMANG

MUHAMMAD IRFAN BIBRA

RUSTIN WINARSIH

RIDHO MARUF QULUQ

HABIYOSO RAFLI

REZA FAUZAN PERMADI


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7.1. A strain gage is to be fabricated from advance wire having a diameter of 0,001 in and

resistance of 25

/in. The gage is gage is to have a gage length of 2 in and resistance of

500

. Design a grid configuration

7.. !rite a concise descri"tion of a foil t#"e resistance strain gage. $nclude the allo#s em"lo#ed

and cover the role of the %arrier and the Tabs.

& Foil' The foil is classified b# its allo# t#"e, the# are Advance allo#, (arma, $soelastic

Allo# and also )ltrathin metal fabricated b# *hotoetching "rocess. Those material/allo#s

used because of their high conductivit# and heat resistant to tem"erature.

A.Advance Alloy' +as high strain sensitivit#, mall grid and high gage factor com"ared

to other allo#

-. Isoelastic Alloy ' +as su"erior fatigue life, com"atible for d#namic stress testing.

%.Karma Alloy

' +igh strain sensitivit#, mostl# used for measurement and has goodstabilit# so common for used in static testing.

& The ole of'

A. %arrier ' because of the fragile t#"ical of the foil, so we use %arrier as a bacing material

during "hotoetching "rocess,. %arrier also facilitate width for installation and also the carrier

for electricit# to get through metal grid.

-. Tabs ' unctioned as an adhesive which is used to transmit the surface dis"lacement

from the s"ecimen to gage grid without an# distortion.

7.5. !rite a s"ecification describing the "rocedure to be followed b# laborator# technician in

installing strain gage on com"onents fabricated from engineering "ol#mers.1. *osition the gage and terminal "atch with trans"arent ta"e

2. ole bac the gage and terminal "atch

. A""l# adhesive over the bonding area

. e"osition the gage andterminal "atch with ta"e, using finger "ressureto force out the

ecessive adhesive.


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7.7. Determine the s#stem sensitivit# for a bridge with a single active gage having g 3 50

and g 3 2.05 if r 3 and the bridge voltage is 54

!hich'

*g 3 42 / 3 25/50 3 0.071 !

s 3 2.05 0.071x 350 / 1 6 3 7.88

o, the sensitivit# of the s#stem is about 7.88

7.9. Determine the voltage out"ut from a wheatstone bridge if a single active gage is used as an

initiall# balanced bridge to measure strain of 1200 :.in/m. Assume that the digital voltmeter

will be used to measure voltage and that g 3 2.08, r 31 and 4s 3 84.

;vo 3 1 8 2.08 1200 :.in/m. /1 6 12 3 70< : in/m 4

7.11. A 50

strain gage with g 3 2.07 is em"lo#ed in a single arm wheatstone bridge with r

3 1. $f the gage is sub=ected to a strain of 1800:.in/m. Determine the reading on a 1/2& digit

D4> if

A. 4s 4olt 3 2 and Am"lifier 3 10

*g 3 42/ 3 /50 !att

;vo 3 1 2.07 10 1800 : 4

350x 350 / 1 6 1 3 120 : in/m 4

-. 4s 4olt 3 and Am"lifier 3 10

*g 3 42/ 3 18/50 !att

;vo 3 1 2.07 10 1800 : 16

350x 350 / 161 3 8820 : in/m 4

%.4s 4olt 3 8 and Am"lifier 3 100

*g 3 42/ 3 8/50

;vo 3 1 2.07 100 1800 : 36

350x 350 / 161 3 99800 : in/m 4

Which:

Ss = Sys!"S!#sii$iy

P% = P&'!( Dicci)*!+

R% = G*%! (!sis*#c!

s 3 r g Pg x Rg /1 6 r

;vo 3 r 4s g ? / 1 6 r2

;vo 3 r g Am" ? Pg x Rg / 1 6 r


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D. 4s 4olt 3 5 and Am"lifier 3 50

*g 3 42/ 3 25/50

;vo 3 1 2.07 50 1800 : 25

350x 350 / 161 3 1000 : in/m 4

7.15. $f the bridge and gage of eercise 7.1 res"ond to a strain of 100 :m/m, determine the

trace deflection if an oscillosco"e having a sensitivit# of 1m4 "er division is used for the

measurement.

@iven in ercise 7.1 '

$m"endance 10>

g 3 50

g 3 .5

r 3 5 and 4s 3 94

i@ 3 5 0.23/350 .5 100 10&8 50/107 / 8 3 .5 10&9 A

, = .5 10&9 1m4 3 .5 10&12 m

7.17. Determine the sensitivit# of gage&bridge&galvanometer s#stem if four eBual arm bridge

132333g is used and g 350

, g 3 2.07, *g 3 0.25!, @ 3 100

and @ 3 0.00mA/ :A

s 3 0.25/1400 2.07

1

1+( 100

1400) 0.00 10 0.5 3 0.0

tugas elektronika instrumentasi kelompok 5

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