Calibration procedure for Weighing Balance.

 

A

 weighing balance is essential to ensure accurate measurements. Here’s a step-by-step procedure for calibration:

 

1.Repeatability

Repeatability measures the variation in multiple measurements taken under the same environmental conditions.

Perform this test for both full load and half load of the balance.

Follow these steps:

Press the Zero button on the balance.

Place the weight (either half load or full load) on the weighing pan.

Note down the reading.

Remove the weight without zeroing the balance.

Repeat the process at least 10 times.

Calculate the standard deviation.

2.Linearity:

Linearity assesses the deviation from the nominal value of weight.

Ideally, the graph between standard weight and indicated reading should be a straight line.

Take readings for different weights (including no load and full load):

Press the Zero button on the balance.

Place the minimum weight on the weighing pan and note the reading.

Continue with increasing and decreasing order of weights.

Repeat this step twice.

Calculate the average for each weight reading.

Linearity = Standard Reading - Weighing Balance (UUC) Reading (UUC is Unit Under Calibration).

3.Eccentricity:

Ideally, the weighing object should be placed exactly at the center of the weighing pan.

However, this is not always possible.

Follow these steps:

Place a weight in the center of the weighing pan.

Observe the displayed value.

Repeat this procedure nine times for the standard weight and record the readings.

 


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