This article will guide you through the steps for calibrating weight using the ABBA method.
Very often we have come across the term ABBA method in Calibration of Weight or Masses. But, we don't really know or understand what does this ABBA Stands for or what does it really mean? In this article we will try to simplify things.
Before proceeding ahead, there are two terms which we need to understand and keep in mind as they form basis of ABBA method.
a) A - Standard for Standard Weight
b) B - UUC Weight (UUC is Unit Under Calibration)
First and foremost we need to select an Appropriate Standard Weight for Calibration of UUC Weights that is, One Class Higher Standard Weight is required for UUC Weight Calibration.
For E2 Class Calibration of Weights, E1 Class Weight is required as Standard Weight and so on.
Lets begin with the Calibration of Weight using the ABBA Method
PROCEDURE:
Keep Standard Weight (A) on weighing balance and note down the reading.
Keep UUC Weight (B) on weighing balance and note down the reading. Remove Weight from the weighing balance.
Again, Keep UUC Weight (B) on weighing Balance and note down the reading.
Keep Standard Weight (A) on weighing balance and note down the reading.
This basically completes one set of reading.
ABA method and AB1…..BnA are similar methods. (Other methods used for calibration of masses).
ABBA - Standard Weight (A) | UUC (B) | UUC (B) | Standard Weight (A)
ABA - Standard Weight (A) | UUC (B) | Standard Weight (A)
AB1…BnA - Standard Weight (A) | UUC (B) | UUC (B) | UUC (B) (n times) | Standard Weight (A)
Minimum Number of Weighing Cycles (as per OIML R-111-1)
Class | E1 | E2 | F1 | F1 | M1 |
ABBA | 3 | 2 | 1 | 1 | 1 |
ABA | 5 | 3 | 2 | 1 | 1 |
AB1...BnA | 5 | 3 | 2 | 1 | 1 |
The equation for Determination of Conventional Mass:-
mct = mcr(1 + C) + Δmw
mct - Conventional mass of Test Weight.
mcr - Conventional mass of Reference Weight.
C - Buoyancy correction factor.
Δmw - is the difference in weight by the ABBA Method.
Note: For the same material weight with the same density, the Buoyancy correction factor is Zero.
ΔM is calculated as follows for ABBA Method.
Let's consider ABBA as A1B1B2A2
ΔM = [(B1-A1) + (B2-A2)]/2
A1 = First Reading of Reference Weight.
B1 = First Reading of Test Weight.
B2 = Second Reading of Test Weight.
A2 = Second Reading of Reference Weight.
ABBA Method in Calibration of Weight is commonly used by all Testing and Calibration Laboratories having ISO 17025 accreditation in India and other countries. Certificates issued by these laboratories in India are most popularly known as NABL Calibration Certificate.
We, here at V CARE IMPEX manufactures Standard Weights of all Classes viz, E1 Class, E2 Class, F1 Class, F2 Class and M1 Class. All our Standard Weights are highly accepted by major all Calibration and Testing Laboratories in India and abroad.
Should you have any requirements regarding the same, please feel free to contact us.