Measurement System Analysis (MSA) is a core factor in modern metrology, as it determines whether a measurement system is capable of performing a measurement task reliably and accurately.

In production environments, measurement results form the basis for quality decisions. If the measurement system itself is not capable, even the most advanced manufacturing process cannot guarantee product quality.

What is Measurement System Analysis?

In industrial measurement technology, a Measurement Process Analysis (MPA) or Measurement System Analysis (MSA) is conducted to evaluate the capability of a measurement system under real operating conditions.

The goal is to determine:

• Measurement accuracy
• Measurement stability
• Systematic deviations
• Influence of operators or environment

By analyzing these factors, manufacturers can ensure that their measuring instruments are capable of completing measurement tasks adequately and reliably.
 

Cg and Cgk – Key Indicators of Measurement Capability

Measurement process capability is quantified using the indices Cg and Cgk.

They evaluate:

Cg → Precision (standard deviation)

Cgk → Combined precision + bias (trueness)

In many industries, a measurement system must meet:

Cg / Cgk > T

The tolerance factor T varies depending on:

• Industry standards
• Component requirements
• Company specifications

The higher the Cgk value, the more capable and reliable the measurement system.