Certificate of conformity

 

With a certificate of conformity you receive a statement whether the balance corresponds to your defined requirements. In combination with a DAkkS calibration certificate it serves as a documented confirmation that the balance fulfills the demanded requirements. The process responsible can choose from different tolerance specifications - depending on their individual demands.

Certificate of conformity based on the measurement uncertainty in use
("accuracy in use")

The appendix on the uncertainty of measurement in use ("accuracy of use") to the calibration certificate makes a statement on the uncertainty of measurement to be expected by the user for each sample quantity in the (calibrated) measuring range of the balance. This measurement uncertainty includes the measurement uncertainty of the measured values determined during calibration and also takes into account additional uncertainty components during use (e.g., the temperature drift of the balance).

The certificate of conformity can be issued on the basis of a relative (percentage) or absolute (in mg, g, kg, etc.) tolerance.

Since the relative uncertainty of measurement of a weighing increases with decreasing load, a relative tolerance specification results in a sample quantity below which the desired relative uncertainty of measurement is exceeded. This is known as the minimum sample quantity. Thus, in the example shown, with a tolerance of 0.01%, the minimum sample weight is 616.54g - below which the relative uncertainty of measurement of the sample weighed would be greater than 0.01%.

 

KERN

Option: conformity assessment based on the uncertainty of use

Sample certificate Price
969-511
969-512
as a supplement to the DAkkS certificate (relative)
as a supplement to the DAkkS certificate (absolute)
Accuracy in use relative
Accuracy in use absolute
on demand

 

Certificate of conformity based on the calibration results

During calibration, the display deviation of the balance is determined at, for example, five test points. Each determined display deviation is assigned a measurement uncertainty, which includes, for example, the accuracy of the test equipment used.

The certificate of conformity shown here evaluates the conformity of the balance to the desired tolerance specification on the basis of this determined display deviation plus the expanded measurement uncertainty. However, a statement about weights between these tested points is not included here.

The certificate of conformity can be issued on the basis of a relative (percentage) or absolute (in mg, g, kg, etc.) tolerance.

 

KERN Option: conformity assessment based on the calibration results Sample certificate Price
969-513
969-514
as a supplement to the DAkkS certificate (relative)
as a supplement to the DAkkS certificate (absolute)
Calibration results relative
Calibration results absolute
on demand

 

 

Certificate of conformity based on the measured values

During calibration, various characteristics of the balance are checked, e.g. off-center load, repeatability, accuracy.

The certificate of conformity shown here makes a statement about these individual measurement results before they are included in the total measurement uncertainty. This allows, for example, to check manufacturer's specifications, but not to make an overall statement about the measurement uncertainty of future weighings.

The measurement uncertainty of individual parameters cannot be taken into account. Only the direct measured values (accuracy, off-center load and/or repeatability) are compared with the specified tolerances (manufacturer's or customer's tolerance) without taking into account the uncertainties.

The certificate of conformity can be issued on the basis of a relative (percentage) or absolute (in mg, g, kg, etc.) tolerance.

 

KERN Option: conformity assessment based on the measured values Sample certificate Price
969-515
969-517
969-516
as specification of manufacturer (other manufacturers)
as specification of manufacturer (KERN)
as specification of customer
Specification of manufacturer/customer
Specification of manufacturer/customer
Specification of manufacturer/customer
on demand
10,-
on demand