Lap.akhir Wheat Stone

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VI. PERHITUNGAN DAN SESATANNYA

• Menghitung Rx

Rb L

L Rx .

1

2= Rx Rb

Rb

L

L

L

L Rx

+∆

+∆

=∆

1

1

2

2

Tabel 1Rb 500 Ohm Rx 1

=∆± )( 11 L L (57,4 cm)05,0± =∆± )( 22 L L (2,6 cm)05,0±

Rb L

L Rx .

1

2= Rx Rb

Rb

L

L

L

L Rx

+∆

+∆

=∆1

1

2

2

Ω== 6,22500.4,57

6,2

Ω=

++= 7,26,22

500

50

4,57

05,0

6,2

05,0

Ω± )7,26,22(

=∆± )( 11 L L (56,2 cm)05,0± =∆± )( 22 L L (3,8 cm)05,0±

=∆± )( Rx Rx (33,8±3,8) Ω

=∆± )( 11 L L (57,1 cm)05,0± =∆± )( 22 L L (2,9 cm)05,0±

=∆± )( Rx Rx (25,3±3,0) Ω

=∆± )( 11 L L (57,2 cm)05,0± =∆± )( 22 L L (2,8 cm)05,0±

=∆± )( Rx Rx (24,4±3,0) Ω

=∆± )( 11 L L (57,6 cm)05,0± =∆± )( 22 L L (2,4 cm)05,0±

=∆± )( Rx Rx (20,8±2,5) Ω

=∆± )( 11 L L (57,0 cm)05,0± =∆± )( 22 L L (3,0 cm)05,0±

=∆± )( Rx Rx (26,3±3,1) Ω

Tabel 1Rb 500 Ohm Rx 2

=∆± )( 11 L L (55,5 cm)05,0± =∆± )( 22 L L (4,5 cm)05,0±

=∆± )( Rx Rx (40,5±4,5) Ω

=∆± )( 11 L L (55,4 cm)05,0± =∆± )( 22 L L (4,6 cm)05,0±

=∆± )( Rx Rx (41,5±4,6) Ω

=∆± )( 11 L L (55,3 cm)05,0± =∆± )( 22 L L (4,7 cm)05,0±

=∆± )( Rx Rx (42,4±4,7) Ω

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=∆± )( 11 L L (55,0 cm)05,0± =∆± )( 22 L L (5,0 cm)05,0±

=∆± )( Rx Rx (45,4±5,03) Ω

=∆± )( 11 L L (55,5 cm)05,0± =∆± )( 22 L L (4,5 cm)05,0±

=∆± )( Rx Rx (40,5±4,5) Ω

Tabel 1Rb 500 Ohm Rx 3

=∆± )( 11 L L (54,6 cm)05,0± =∆± )( 22 L L (5.4 cm)05,0±

=∆± )( Rx Rx (49,4±5,4) Ω

=∆± )( 11 L L (54,6 cm)05,0± =∆± )( 22 L L (5.4 cm)05,0±

=∆± )( Rx Rx (49,4±5,4) Ω =∆± )( 11 L L (55,2 cm)05,0± =∆± )( 22 L L (4,8 cm)05,0±

=∆± )( Rx Rx (43,4±4,8) Ω

=∆± )( 11 L L (54,8 cm)05,0± =∆± )( 22 L L (5,2 cm)05,0±

=∆± )( Rx Rx (47,4±5,2) Ω

=∆± )( 11 L L (55,3 cm)05,0± =∆± )( 22 L L (4,7 cm)05,0±

=∆± )( Rx Rx (42,4±4,7) Ω

Tabel 2 Rb 400 Ohm Rx 1

cm L L )05,06,51()( 11 ±=∆±

cm L L )05,04,8()( 22 ±=∆±

Rb L

L Rx .

1

2= Rx Rb

Rb

L

L

L

L Rx

+∆

+∆

=∆1

1

2

2

Ω== 1,65400.6,51

4,8 1,65

400

50

6,51

05,0

4,8

05,0

++= =8.6

± )6,81,65(

=∆± )( 11 L L (50 cm)05,0±

=∆± )( 22 L L (10 cm)05,0±

=∆± )( Rx Rx (65,1±8,6)Ω

=∆± )( 11 L L (50,3 cm)05,0±

=∆± )( 22 L L (9,7 cm)05,0±

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=∆± )( Rx Rx (77,1±10,1)Ω

=∆± )( 11 L L (51,7 cm)05,0±

=∆± )( 22 L L (8,3 cm)05,0±

=∆± )( Rx Rx (64,2±8,5) Ω

=∆± )( 11 L L (51,4 cm)05,0±

=∆± )( 22 L L (8,6 cm)05,0±

=∆± )( Rx Rx (66,9±8,8) Ω

=∆± )( 11 L L (51,2 cm)05,0±

=∆± )( 22 L L (8,8 cm)05,0±

=∆± )( Rx Rx (68,75±9,05) Ω

• Tabel 2 Rx 2

=∆± )( 11 L L (54,3 cm)05,0± =∆± )( 22 L L (5,7 cm)05,0±

=∆± )( Rx Rx (41,9±5.6) Ω

=∆± )( 11 L L (54 cm)05,0± =∆± )( 22 L L (6.00 cm)05,0±

=∆± )( Rx Rx (44,4±5,96) Ω

=∆± )( 11 L L (54,5 cm)05,0± =∆± )( 22 L L (5,5 cm)05,0±

=∆± )( Rx Rx (40,3±5,4) Ω

=∆± )( 11 L L (53,9 cm)05,0± =∆± )( 22 L L (6,1 cm)05,0±

=∆± )( Rx Rx (45,2±6,1) Ω

=∆± )( 11 L L (53,8 cm)05,0± =∆± )( 22 L L (6,2 cm)05,0±

=∆± )( Rx Rx (46,09±6,17) Ω

=∆± )( 11 L L (54,1 cm)05,0± =∆± )( 22 L L (5,9 cm)05,0±

=∆± )( Rx Rx (43,6±5,9) Ω

• Tabel 2 Rx 3

=∆± )( 11 L L (52,7 cm)05,0± =∆± )( 22L L (7,3 cm)05,0±

=∆± )( Rx Rx (55,4±7,3) Ω

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=∆± )( 11 L L (52,8 cm)05,0± =∆± )( 22 L L (7,2 cm)05,0±

=∆± )( Rx Rx (54,5±7,2) Ω

=∆± )( 11 L L (53,1 cm)05,0±

=∆± )( 22 L L (6,9 cm)05,0±

=∆± )( Rx Rx (51,9±6,9) Ω

=∆± )( 11 L L (53 cm)05,0± =∆± )( 22 L L (7,0 cm)05,0±

=∆± )( Rx Rx (52,8±7,02) Ω

=∆± )( 11 L L (52,9 cm)05,0± =∆± )( 22 L L (8,1 cm)05,0±

=∆± )( Rx Rx (61,2±8,1) Ω

=∆± )( 11 L L (53,2 cm)05,0± =∆± )( 22L L (6,8 cm)05,0±

=∆± )( Rx Rx (51,1±6,8) Ω

• Menghitung Rx rata-rata

a) N

Rx Rx

∑=

1

)( 22

−=∆ ∑

N

Rx N Rx Rx

Tabel 1Rb 500 Ohm Rx 1

N

Rx Rx

∑=1

)( 22

−=∆ ∑

N

Rx N Rx Rx

=25,53Ω =4.52

(25,53 Ω± )52,4

Tabel 1Rb 500 Ohm Rx 2

(42,12±1,72)Ω

Tabel 1Rb 500 Ohm Rx 3

(45,9±3,2) Ω

• Tabel 2 Rb 400 Ohm Rx 1

(69,34±7,63) Ω

• Tabel 2 Rb 400 Ohm Rx 2

(42,58±2,19) Ω

• Tabel 2 Rb 400 Ohm Rx 3

(54,48±3,72) Ω

b) Ω=+= 43,472

).400()500( 111

Rx Rx Rx

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=2 Rx 42,35Ω

3 Rx 50,19Ω

= 66,46 Rx

1

)( 22

−=∆∑

N

Rx N Rx Rx =14,55

(46,66 Ω± )55,14

• Menghitung 1 L dan 2 L untuk setiap Rx

o Untuk Rx 1

N

L L

∑= 1

1

1

)(2

1

2

1

1−

−=∆∑

N

L N L L

=12

7,648=

11

3468,111

=54,06 cm = 3,18

(54,06±3,18) cm

N

L L

∑=

2

2

1

)(2

2

2

2

2−

−=∆∑

N

L N L L

= 12

3,71

= 11

7468,113

= 5,94 cm = 3,21

(5,94±3.21) cm

o Untuk Rx 2

=1 L (54,72±0,25) cm

=2 L (5,28±0,71) cm

o Untuk Rx 3

=1 L (53,94±1,15) cm

• Membuat GRAFIK

Rb L

L Rx .

1

2= Rb L Rx

L ..1

21 =

xat y .=

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bt xat y += .

%100 graf

hit graf

Rx

Rx R KSR

−=

Tabel 1 Rx 1

%100 graf

hit graf

Rx

Rx R KSR

−=

= %10053,25

66,4653,25 −= 82,76%

Tabel 1 Rx 2

%88,10%10012,42

66,4612,42=

−= KSR

Tabel 1 Rx 3

%65,1%1009,45

66,469,45=

−= KSR

Tabel 2 Rx 1

%7,32%10034,69

66,4634,69=

−= KSR

Tabel 2 Rx 2

%58,9%10058,42

66,4658,42=

−=

KSR

Tabel 2 Rx 3

%35,14%10048,54

66,4648,54=

−= KSR

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VII. ANALISA

Dapat terlihat dari Konstanta Kesalahan Relatif (KSR) bahwa percoban ini pun

tidak benar-benar menghasilkan nilai resistansi (R) yang tepat benar. Hal ini

bisa disebabkan banyak hal seperti, kurangnya ketelitian dari praktikan, kalibrasi

alat yang kurang tepat, kurang teliti pada saat menghitung jarak dan kualitas alat

yang kurang baik.

VIII. KESIMPULAN

• Penentuan hambatan dengan menggunakan metode

Jembatan Wheatstone tidak benar-benar tepat terlihat dari nilai KSR yang

dihasilkan

• Kesalahan hasil akhir dapat disebabkan oleh kalibrasi

ataupun kualitas alat yang kurang baik

• Ketelitian dari praktikan juga sangat menentukan

keberhasilan percoban terutama saat menghitung jarak (L)

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