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 File: S02

 Calibration of a weight of nominal value 10 kg

 Logo

 
 

 Calibration of a weight of nominal value 10 kg

 

The calibration of a weight of nominal value 10 kg of OIML class M1 is carried out by comparison to a reference standard (OIML class F2) of same nominal value using a mass comparator whose performance characteristics have previously been determined.

 

 

Model Equation:

   m_X = m_S + del_m_D + del_m + del_m_C + del_B

 

Symbol List:

 Symbol

Unit

  Definition

 m_X

 g

  conventional mass of the unknown

 m_S

 g

  conventional mass of the standard

 Del_m_D

 g

  change of value of the standard since its last calibration due to drift

del_m

 g

  observed difference in mass between the unknown mass and the standard

 Del_m_C

 g

  correction for eccentricity and magnetic effects

 del_B

 g

  correction for air buoyancy

  m_X:
Result
  m_S:
Type B normal distribution
Value: 10000.005 g
Expanded Uncertainty: 45·10-3 g
Coverage Factor: 2

REFERENCE STANDARD: The calibration certificate for the reference standard gives a value of 10 000,005 g with an associated expanded uncertainty of 45 mg (coverage factor k=2)

  del­m_D:
Type B rectangular distribution
Value: 0 g
Limits: ±15·10-3 g

DRIFT OF THE VALUE OF THE STANDARD: The drift of conventional mass of the reference standard is estimated from previous calibrations to be zero within limits ±15 mg

 

 

 

 

 

 Date: 1998/09/21

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 File: S02

 Calibration of a weight of nominal value 10 kg

 Logo

 
 

 
 del_m:
Type A
Method of observation: Indirect SUUS
Number of observation: 3

 No.

 Hint

 Reading

Observation

 1

 Standard

 0,010
 

 Unknown

 0,020

  
 

  Unknown

 0,025

  
 

  Unknown

 0,015

 0,0100

 2

  Standard

 0,025

  
 

  Unknown

 0,050

  
 

  Unknown

 0,055

  
 

  Unknown

 0,020

 0,0300

 3

  Standard

 0,025

  
 

  Unknown

 0,045

  

 

  Unknown

 0,040

 

  Unknown

 0,020

 0,0200

Arithmetic Mean: 0.0200 g
Pooled Standard Deviation: 25·10-3 g
Standard Uncertainty: 0.0144 g
Pooled Degrees of Freedom: 50

COMPARATOR / OBSERVATION: A previous evaluation of the repeatability of the mass difference between two weights of same nominal value gives a pooled estimate of standard deviation of 25 mg.

del_m_C:
Type B rectangular distribution
Value: 0 g
Limits: ±10·10-3 g

COMPARATOR: No correction are applied for the comparator whereas the uncertainty due to eccentricity and magnetic effects is estimated to have rectangular limits of ±10 mg

del_B:
Type B rectangular distribution
Value: 0 g
Limits: ±10·10-3 g

AIR BUOYANCY: No correction is made for the effects of air boyancy, the limits of deviation are estimated to be ±1.0E-6 of the nominal value

  Quantity

  Value

 Standard

 Degrees

 Sensitivity

  Uncertainty-

   

 Uncertainty

 of

 Coefficient

 Contribution

     

 Freedom

 

  

m_S

 10000.0050 g

 0.0225 g

50

1.00

0.0225 g

del_m_D

 0.0 g

0.00866 g

infinity

1.00

0.00866 g

del_m

 0.0200 g

0.0144 g

50

1.00

0.0144 g

 del_m_C

 0.0 g

0.00577 g

 infinity

1.00

0.00577 g

del_B

 0.0 g

0.00577 g

infinity

 1.00

0.00577 g

 m_X

10000.0250 g

 0.0293 g

122

 Date: 1998/09/21

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 File: S02

 Calibration of a weight of nominal value 10 kg

 Logo

 

   
 Result:
Quantity: m_X
Value: 10000.025 g
Expanded Uncertainty: ±0.059 g
Coverage Factor: 2.0
Coverage: 95.45%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Date: 1998/09/21

.

 Page 3 of 3

 

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