Analytical Balance Testing Procedures

This video tutorial provides an in-depth analysis of USB Journal Chapter 1251, focusing on the calibration parameters of analytical balances. It covers the sensitivity, eccentricity, and linearity tests, explaining their execution and acceptance limits. The video emphasizes performance qualification and provides examples to illustrate key concepts. The tutorial concludes with a preview of the next topic on weighing boxes and balance types.

What is the primary focus of USP Journal Chapter 1251?

• Measuring liquid volumes

• Weighing on an analytical balance

• Calibration of thermometers

• Testing chemical reactions

Which of the following is NOT a main topic in Chapter 1251?

• Qualification

• Chemical Analysis

• Introduction

• Operation of Analytical Balance

What is the acceptance limit for the Sensitivity Test?

• 0.50%

• 0.01%

• 0.05%

• 0.10%

In the Eccentricity Test, where is the weight first measured?

• At the left corner

• At the back corner

• At the center

• At the right corner

What percentage of the balance capacity should the Eccentricity Test weight be?

• 30%

• 40%

• 20%

• 10%

Which test requires the weight to be measured at all corners of the balance pan?

• Repeatability Test

• Sensitivity Test

• Linearity Test

• Eccentricity Test

What is the acceptance limit for the Eccentricity Test?

• 0.50%

• 0.10%

• 0.05%

• 0.01%

What is the operating range used in the Linearity Test example?

• 40 mg to 400 g

• 30 mg to 300 g

• 20 mg to 200 g

• 10 mg to 100 g

How many readings are taken for the minimum test weight in the Linearity Test?

• 7

• 5

• 6

• 4

What is the formula used to calculate linearity?

• Observed weight reading 1 minus observed weight reading 2 divided by observed weight reading 1 into 100

• Weight at the center minus weight at individual corner divided by weight at the center into 100

• Certificate weight minus observed weight divided by certificate weight into 100

• Observed weight reading 2 minus observed weight reading 1 divided by observed weight reading 2 into 100