Weigh in the centre of the pan
Weighing in the centre of the pan gets the most accurate weighing results.
Balances are not perfect measuring instruments. Error can be introduced into your weighing results if you weigh your vessel / sample at the extremity of the pan or if weighing a large vessel /sample, that covers the pan, is loaded unevenly. To minimise the effect of this type of error it is important to weigh in the centre of the pan and ensure all vessels / samples are loaded evenly.
This type of error in weighing is known as eccentricity error. It can also be known as corner load error or off centre loading error. This error should be assessed by your service provider and detailed on your certificate of calibration. One way to use the eccentricity data is to monitor it over a period of time. If the eccentricity error is progressively getting worse it may indicate the balance is nearing its end of life or needs to be repaired.
If you have a UKAS certificate of calibration it is also important to weigh in the centre of the pan. When our engineers assess the performance of your balance they apply their weights to the centre of the pan when performing repeatability tests. This data is then used to determine the Uncertainty of Measurement, which is stated on the certificate. If users are performing weighing’s that are not positioned in the centre of the pan the Uncertainty of Measurement stated on the certificate may not be relevant.
Need more help?
If you would like to discuss this further book a free call with one of our technical specialists. To arrange this Contact Us with details of your query and contact details and we will arrange to call you.